Promaxx sbc heads flow numbers

 

Air Flow Enhancers; Ford 429 460 300cc 98cc CNC Solid-FT Complete Aluminum Cylinder Heads. 60 stainless-steel valve package. ProMaxx Welded on the head, surfaced the weld of the head, and sent it to me just as it would come to you out of the box The Maxx 200 By flowing over 280cfm through a 2. com site are generated at 25" H20, which is not a standard test pressure. Most flow numbers for DART heads were from DART or their Web Site updated Aug. Trick Flow 320cc as cast heads bare $1650 -Hand ported Trick Flow pair $2350 (Available in a variety of sizes to fit your engine needs. Ultimate Chevy Big-Inch Small-Block Cylinder Heads Cheat Sheet Now we get into the heart of small block power. Mar 01, 2008 · Now, $1,500 later, the guy clamped his freshly ported heads onto a flow bench in another shop to show off the awesome porting job. . $1550. PROMAXX Performance Maxx Series Small Block Chevy Cylinder Heads 9183 Manufacturer's Part Number: 9183 Summit Racing Part Number: PMX-9183. 02" intake/1. The MAXX Series is taking the affordable performance cylinder head to the next level. After all was said and done the heads now flow [email protected]. It has all the bells and whistles and even gives us information that we didn't even ask for. -CNC ported RHS heads with Weingartner Racing Port design assembled for solid roller cams up to . The small block Chevy 180cc cylinder head was the foundation in 2007 for FLOTEK Performance Heads. ProMaxx Automotive offers quality aftermarket accessories at great prices. Flow numbers from 387- 427cfm have been achieved) May 15, 2019 · Edelbrock doesn't show flow numbers for their heads. For the flow remember bigger is not always best. The ProMaxx Performance heads promised two things we love: plenty of flow and affordable pricing. 660, FT or HYD Erson springs. ProMaxx is working on an Oval Port head in the 280cc range, a 337cc, and 367cc. Credit for those impressive flow figures goes to full CNC porting, including the 60cc combustion chambers and a 2. They’re not as bad as early Ford small-block heads, but close. The better place to compare intake flow numbers for most street cylinder heads is in the midlift flow area, with an emphasis on the 0. All flow numbers for Darin Morgan heads come from Darin Morgan Web Site updated Oct. Edelbrock Performance Cylinder heads are manufactured of A356 aluminum and made in the USA for AMC, Buick, Chevy, Chrysler, Ford, Oldsmobile, & Pontiac engines. We now have a SAENZ model 680 flow bench which we all enjoy using. Head bolts such as 50542171 and washers 50542102 are recommended. OK, saving a few pounds helps. 120" thick-wall pushrods. torque on the bottom. Our maxim is to provide value-driven auto accessories that focus on quality, affordability and functionality to satisfy a wide variety of needs. Nearly everyone else does. i m pretty new on the head porting game . 2. head available that produces CNC type flow number, flowing over 280cfm. Flow measured at 28" of depression. Each component undergoes a detailed manufacturing process that involves the hundreds of calculated and precision steps to ensure the finest quality possible. 462 is the most-used SBC head casting number out there- at least six different SBC cylinder head casting numbers end in 462, according to 'the books': 3767462 3782462 3814462 3890462 3891462 3990462 Check the cam lobe lift on the problem cylinder before getting into any serious head rebuilding or swapping. the guy had done saw cuts showing the ports and had tested the materail. I got the heads from a friend that own's a speed shop brand new bare for $500 ea. '12. Free shipping when your order includes this part. Precision Race Engines Aluminum Small Block CNC Ported Chevy Cylinder Heads $ 1,099. 550" double springs available This head is reocmmended for Maximum Performance & Full Competition, Heads-Up & Super Classes, over 7000 rpm, 400+ ciDART PRO 1 aluminum cylinder heads for small-block V8’s deliver advanced airflow Roller . - SBC Cylinder Head Info - I've compiled the following information on SBC Cylinder heads to help compare them. Manufacturer of high performance cylinder heads and manifolds for ford and chevy P heads in the local JY are 150, i talked to a reputable shop in town, and its 200 to have em machined, plus a hundred or so for a new spring kit, and 100 for that set of headers that was linked earlier, puts me at about the price of the aluminum heads, and about where i want to be anyway, so i might just go that route. ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads. The Vortec Bow-Tie heads are beefed-up Vortec passenger car heads with better air flow, a thicker deck, both center-bolt and outside valve cover bolt patterns and the Vortec and conventional intake manifold bolt patterns. These large runner, high flow heads are custom built by FTI from RHS Pro Action cylinder head castings. Founded in 2007, we offer an extensive selection of cylinder heads for Ford, Chevrolet, and GMC performance engines. Re: Anyone running cheap eBay heads? July 22nd, 2014, 07:46 AM I've seen some scary reports when a qualified machinist gets ahold of mystery ChinaCo heads and starts measuring everything, like valve guide angles, installed height on the springs, spring consistency, valve job issues, rocker stud mis-locations, casting porosity, etc. 60″ valve sizes, 64cc chambers, 183cc Intake Runner. Performance Cylinder Heads Locally Owned and Operated. These Pro Action 215 cylinder heads are the perfect choice for big inch street rods, serious muscle cars, oval track and drag racing applications. The team has shared all the finest moments in the numerous accolades for its people, its products, and its approach. d. The flow tests resulted in 250 cfm through the intake port at 0. $760. as for Promaxx they are doing my new marine Supercharger series heads!! so for whatever that's worth to ya. This sale is for a set of heads (2 heads). (see chart below) USA moly retainers, USA machined locks, USA locators, USA 190,000 PSI studs, USA guide plates. 3333. Skip White Performance provides many high performance racing and engine products such as, stroker engines, turn-key engines, cylinder heads and pistons Related products. Heads are not drilled for steam holes that are required on SBC 400 engines. 00 ProMaxx SBC 225cc CNC Ported Small Block Chevy Cylinder Heads $ 1,199. There's videos on youtube where a guy had the alumnun tested, and it was top quality stuff. ProMAXX Performance has designed a complete new line of performance heads that meet or exceed the big names in the industry. '09. they just closed down and changed there name see if we can get some fed backk from the pros on them. We can also supply you with a matching camshaft and intake. they are clean, as nice of anything I've paid double for outta Brodix!! and they flow pretty damn close to what they claim, and the minor variance I would attribute to a difference in flow testing equipment and/or environmental issues Aug 01, 2006 · When looking at the flow numbers for various aftermarket heads, keep in mind that airflow depends on many things: the profile and volume of the runners, the shape of the bowls and combustion chambers, the size of the valves, the angles on the valve seats, the rate at which the valves open, maximum valve lift, duration and overlap. Jan 31, 2015 · Cylinder heads involve a lot more than just rocker arm ratios and valve spring installed heights. Dart PRO1 23° 215cc Platinum series heads are for big cubic inch, high RPM applications which favor peak power over low end flexibility. 020" valve, The MAXX 200 SBC produces awesome air speed on the intake side coupled with a D-shaped exhaust port and super efficient chamber design produces MAXX power for the street or strip. Patriot Performance LS1 / LS6 / LS2 Series heads come fully assembled and can handle blown or nitrous applications. The Maxx 200 is the ultimate “as cast” head available that produces CNC type flow number, flowing over  The 185cc series 1 heads are perfect for that budget build. Their 185cc heads out perform the dart shp 200 heads and comparible edelbrock heads. But as you stated, you don't need big flow numbers or ports. That is why we wanted to get all the heads under one roof and test them under the same conditions. Flow Specs @ 28″  Buy ProMaxx Performance 9200 at JEGS: ProMaxx Performance 200 Series Aluminum View All ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads Part Number: 723-9200 Even the ''as cast'' heads utilize ultra -smooth new runner and chamber designs that produce ''CNC'd type'' flow numbers. This head is a brand new piece from a brand new source. These Pro Comp Cylinder Heads have a thick Deck Design and High Capacity water jackets that makes them a reliable choice for street or strip Re: Horsepower potential based on cylinder head flow Way to many variables to give any kind of a real number but if you want to play around here is one that I have from a posting on speedtalk. 00. The Vortec Bow-Tie head has a superior chamber design. The Maxx 200 is the ultimate “as cast” head available that produces CNC type flow number, flowing over 280cfm. Looking at these Check pushrod clearance with heads placed on the block before final assembly. Jan 16, 2015 · As can be seen from the flow numbers in Figure 5. BRODIX is the undisputed leader in big block Chevrolet compatible technology. I find the Chinese aftermarket heads that have a good valve job can do what you need, but they typically are low on exhaust side flow, which can be corrected to a point. To address this weakness, our engine builder has done some mild pocket porting work and back-cut the exhaust and intake valves to improve the low-lift flow. ProMaxx SBC 183cc As Cast (Bare Heads). 600-inch lift and our cam barely cleared the 0. Jason 320 heads out of the box nothing done to them on a 496 big block chevy on alcohol. Maxx 200 SBC (Sold in Pairs). Recommend head gasket for 4” bore engines is the Fel-Pro 1003 style gasket. 00 ProMaxx BB Mopar 210cc Cylinder Heads Jun 19, 2006 · The Edelbrock Performer RPM heads had excellent flow numbers, and they provided exceptional power and torque during our dyno testing. At 3,900 rpm these heads produced 491 lb-ft peak torque and PROMAXX 200 BARE HEADS FOR SBC CHEVY ENGINES. 00 – $1,220. SBC 220cc Hand Blended 2. Flow data based on Cylinder #1 intake and exhaust port. Flow data listed on the www. 200CC runners for velocity, but the average flow numbers for . In this chapter I discuss formulas for converting combustion chamber volumes, exhaust to intake ratios, valve curtain area, port crosssectional area, and various other factors that affect the performance potential of any cylinder head. Taking the affordable performance cylinder head to the next level. The midrange flow numbers are fairly decent as well, with 194 cfm ProMaxx Performance Cylinder Heads available: Big Block Chevrolet (BBC) Cylinder Heads available in 320cc & 360cc at different valve sizes. The Latest in State of the Art Cylinder Heads and Intake Manifolds for Racing and Street Performance Pro-Filer / Wilson SBC The All New Pro-Filer / Wilson Small Block Single Plane Intake features Cast Fuel Injection Bosses and perfect runner to plenum volume. Sporting no less than 572 cubes, this BBC stroker needed plenty of airflow to feed all those extra inches. Pro Comp Aluminum Cylinder Heads are a great choice for an out of the box horse power upgrade for your Small Block Chevy. 317cc intake runners great for street, street/strip, power tour, or smaller cubic inch competition (427-525ci). Several of the SEGA guys run 4V heads to good effect. 02" Intake Valve and 1. So you can compare those numbers to Patriot and see what you think. Apr 04, 2014 · ProMaxx 200cc NEW SBC Performance Cylinder Head 2. 5º, 12º, and 9° versions. This head has produced over 550 hp on pump gas and mild cam . Re: Dart Pro 1 215 heads vs. 800 in and 285 ex @ . very glad to see the info on these heads . Notes: P. i. All flow numbers for David Vizard heads come from Web Site updated April '08. A test of the head on a 500+ incher will be coming out in a magazine article very soon. No more guess work. Trick Flow products perform as advertised and exceed customer's expectations for performance and value. Jason Collins Call us at anybody here run the promaxx (former patriot) heads? specifically the 2117 or 2121 225cc runner versions? thinking of picking some up for a budget solid flat tappet 350 shoot for maybe 500 crank hp, rev to 6800-7000, single plane intake, 4150 holley 750DP Trick Flow Specialties is a leading designer and manufacturer of high performance cylinder heads, intake manifolds, and engine components. i saw a vidoe on youtube of the promaxx heads. You can have a killer camshaft, valvetrain, intake manifold, carb, and headers, but if you bolt ‘em to a weak set of heads, you won’t make power. These heads flow acceptable intake flow numbers for a stock head, but suffer greatly from a weak exhaust port. 91 Chevy SBC 350 Hyd FT 190cc Straight Plug Cylinder Head SBC ProComp Aluminum Cylinder Heads 210 Runner Assembled - Item # PCM 3003C. Please select a quantity of 2 on the following page to order a pair of cylinders This is where it all started! FLOTEK’s 180cc Cylinder Head for Small Block Chevrolet. Our cylinder heads are cast according to FLOTEK design parameters and assembled and inspected at our facility in Evansville, Indiana. This new foundry that ProMaxx is working with makes nice stuff from everything we have been sent. ProMaxx BBC 370cc CNC Ported Big Block Chevy Cylinder Heads $ 1,940. AD Performance DART Pro 1 230cc 23 degree Aluminum Head [11710040] - DART PRO 1 230cc Aluminum Cylinder Heads230cc runner64 or 72 cc ChamberStraight or Angle Plug1. I bought a '73 split bumper (just a Z28 clone but I like it) about 6 months ago. 65 exhaust valves, larger than the biggest factory SBC. I figured out why Patriot closed up and changed its name. Iron. 08/1. With Freedom Series small block Chevy cylinder heads, PROMAXX Manufacturer's Part Number: 2169. Making great Features; Flow Chart; Cylinder Head Options; Technical Specs; Additional information. Related products. 02″/1. 500-inch-lift threshold. His words not mine he "said He didn't have to work that hard to get those numbers". Heads are valve jobbed, decked, and bagged for assembly. The ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads are . these heads are actually patriot clyinde heads. The ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. Equals heavy. 64cc COMBUSTION CHAMBERS, 200cc RUNNERS, STRAIGHT PLUG. Re: FlowBench numbers on various SBC heads 07-03-02 08:24 PM - Post# 113472 In response to MaxRaceSoftware 68corvette ; i've #291 1. The heads he's talking about are made by promaxx, and from all the reviews and articles i've seen, they make some nice heads. Metal clad seals. 0 Headbytes Porting. 200 through . Skip White Performance provides many high performance racing and engine products such as, stroker engines, turn-key engines, cylinder heads and pistons The problem with OE iron is the limited ceiling in performance. I ordered a set of their cast iron heads, bolted them onto the motor, and noticed something was off. AFR 210 05-02-03 04:30 PM - Post# 222127 In response to 4_Speed_Dave I picked the new new new Brodix 200CC RaceRites for my 400 big SB. Even the ''as cast'' heads utilize ultra-smooth new runner and chamber designs that produce ''CNC'd type'' flow numbers. 14 the EQ heads acquitted themselves very well. Use Permatex 80631 style sealant on the threads. And everybody runs from iron heads due to there weight. The head turned many heads at the PRI. Description. Trick Flow Super 23® 195 cylinder heads for small block Chevy are a direct fit, high performance replacement for factory heads and accept most original accessories. The "small" 2V has 2. I have been looking at them for a year now but only found info from promaxx . Keep that in mind when looking at the numbers. My intake is a used Edelbrock Performer RPM (7101) that i managed to snag at swap meet for $50. About a week ago i managed to get the heads bolted onto the engine. $1,966. BES Racing Engines now offers complete cylinder head packages. Ideal for 302- 406 c. 08/1 Find PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads 2169 and get Free Shipping on Orders Over $99 at Summit Racing! PROMAXX Performance Freedom Series small block Chevy cylinder heads offer exceptional quality at an unbelievable price. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. Comparing flow numbers from manufacturer to those from another is not a sound comparison, since the heads were not tested at the same time, by the same operator, on the same machine, etc. ProMaxx has sold over 200 sets of these and many pairs have gone to some well known BBC crate engine builders. The new SBC heads and the new FE head are both very nice pieces. I know that doesn't mean much, but everything I've been finding on promaxx is good. Their BB Chevy line seems to be a mixture of different companies/castings. Part Type: Summit Racing Part Number: PMX-2169. Features If for any reason you purchase a set of heads from SRH, or have yours ported, and they don't perform like we discuss, send them back and I will work on them until they do, free! Or trade back and put you in a different set! Better than any flow data guarantee! Speier Racing Heads now has in-house wet flow capabilities! Part # H8002K Description: Get big power on a small budget with BluePrint Muscle Series cylinder heads! These lightweight aluminum heads bolt up to your small block Chevy and feature 195cc intake/75cc exhaust runners, 64cc combustion chambers, and 2. It has a 357 SBC in it with cast iron Vortec 062 heads which have 170cc intake runners I believe (all 062 heads do, right?). There is no comparison in the market. Specs: 2. stands behind each product we manufacture 100%. Jan 02, 2010 · It took the aftermarket cylinder head industry about 20 years to figure the same thing out, and to start offering high performance oval port heads for the big-block Chevy enthusiast. 750 lift $3040 . The numbers read something like this: 5/17. Then, in 1997, the third-generation small block was released. 383. Summit Racing offers three series of PROMAXX cylinder heads: Freedom Series Aluminum Heads for Small Block Chevy These assembled heads feature a choice of 185cc, 190cc, or 225cc intake runners and 64cc or 72cc CNC bowl-blended combustion chambers with a five-angle valve job. All I can say is the head did very well. Flo-Tek 102505 Assembled S/B Chevy Aluminum Head, Straight Plug made by Flo-Tek, for as low as $399. Why buy a set of heads with the wrong parts when we can build you a custom ported set of heads complete, ready to bolt on with the right parts. Roller. Unjustified IMO unless your drag racing for money. SBC Bare STRAIGHT PLUG Aluminum Heads 64cc Chamber, 200cc runner ** These 200cc runner heads have made 30 hp OVER ANY of the 210cc heads we have tested in this same price bracket** These heads feature Hardened Seats Bronze Valve Guides High Grade My plan is to flow them against brand new TFS FAC 170cc heads, an ebay head that I picked up (which I'll compare to the Proheader castings as they may be identical), ProMaxx 9175 heads (which appear to be the same casting as Edelbrock E-Streets), and possibly an AFR 185 (most likely #1388), all heads will be box stock. powerheads. 800. Torque to 50-65-80 ft. Conventional style cylinder heads are available in 26º, 24º, and 20º valve angles, and spread port heads are available in 18º, 16º, 14. 60" exhaust valves. Casting number "462" fuelie heads. Serious street performance, modified oval track and bracket racing. engines, these heads feature high-velocity, small cross-section intake runners to promote low-rpm torque and high-rpm horsepower. Since it is almost impossible to compare the flow numbers from different flow benches I have started this page to show you how much cfm gain I have gotten out of the heads I have ported. The first thing i should mention is that in the literature for these heads, promaxx mentions that some "intake bolt hole slotting may be required" which was the case for me. I just ran this against the flow numbers on my 4 cyl import motor and this actually came pretty darn close --Seriously within 2HP --- Go figure. 300- and 0. Some small block Chevy engines had problems with valve guides near the heat riser/EGR valve passages tightening up and causing premature cam lobe wear (also pushrod bending) due to hot spots caused by the constant flow of exhaust gas to the EGR valve. A little later on i saw in one of the Mopar mags or engine Builder mag were they were talking about how good there were wright out off the box but can't remember were it was that i saw it . 5:1 350 small-block Chevy deliver in excess of 600 hp and 465 ft-lbs without requiring a massive budget. When we decided to sell After-market Performance cylinder head the decision was easy! When performance counts, Patriot Performance Stage II/III CNC-ported cylinder heads for the LS1 / LS6 / LS2 series engines. Show Product Info Part Number: 723-9183 · ProMaxx Performance 9183  ProMaxx SBC 183cc As Cast (Bare Heads) = $699 pr. Dart Machinery, LTD. Our combinations are proven. 600 are 238CFM, more than both the 210AFR and Dart 215's bigger ports. Best for 400+ cubic inch engines. SBC Bare STRAIGHT PLUG Aluminum Heads 64cc Chamber, 200cc runner ** These 200cc runner heads have made 30 hp OVER ANY of the 210cc heads we have tested in this same price bracket** These heads feature Hardened Seats Bronze Valve Guides High Grade Cylinder Head Flow Data @ 28 Inches of Water Air Flow Detail #176 SBC All American Head - 195cc Runner. 00 ProMaxx BBC 317cc Big Block Chevy Cylinder Heads $ 1,150. 60" exhaust valve. Part Type: Cylinder Head Application: ProMaxx Maxx Series Chevrolet Small Block Cylinder Head Material The ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. I bought a set of their 200cc sbc heads recently for my fiancés Chevelle. AFR Eliminator Series SBC 195's! AFR's All new port design, all new chamber design, new casting design and updated valvetrain! The new AFR 195 race ready head outflows the previous comeptition version head (Roughly 285 cfm out of the box!) Jun 30, 2019 · Pick a cam grinder that knows Clevelands, like Bullet or Cam Research, and it will run like a scalded ape. 00 Precision Race Engines Aluminum Small Block Chevy Cylinder Heads FLOTEK is a leading brand of aluminum high-performance cylinder heads. Honestly the casting looks better than the set of AFRs I bought for my BBC. The numbers are from our in-house flow bench. ProMaxx Automotive Accessories are available exclusively through Meyer Distributing Authorized ProMaxx Retailers. would like to ask some of the pro guys to check it out and see what they think of them. Here, we have two sets of Pro Comp Heads that are going to be put to the test to see if the CNC-porting is worth it's price. Dec 12, 2018 · The first generation that started it all in 1955, remained in effect until 1992, when the second generation (LT1) was released. "except little higher lo lift flow" or INDY {just buy them from someone else ,other than Indy Cylinder Heads, IMO poor customer service} or AFR have had some great write ups too, {depends on what head, but latter 2, INDY & AFR can be a bit pricey & need special parts, but are good} If your serious, want to know, just compare Promaxx int/exh cfm flow's Re: Anyone running cheap eBay heads? July 22nd, 2014, 07:46 AM I've seen some scary reports when a qualified machinist gets ahold of mystery ChinaCo heads and starts measuring everything, like valve guide angles, installed height on the springs, spring consistency, valve job issues, rocker stud mis-locations, casting porosity, etc. The second-generation engine featured aluminum heads, reverse-flow cooling (the heads received coolant first, in lieu of the block), and electronic controls. So with a hydraulic roller Not seeing how assault heads would be better. 225cc/64cc Straight Plug, Hydraulic Roller ,  Jul 19, 2016 So far I have nothing but GOOD news for these heads and they put the Edelbrock heads to shame in both quality and flow numbers. Pro Filer Small Block Chevy All American Heads with 195cc Intake Runner, 2. Mills - Flat or angle mills could affect flow numbers and might require a thicker intake gasket. AFR recommends the use of . Well 2 sets of intake gaskets and 3 intakes later I measured the heads and all of the holes and ports on one head were 60 thousandths off from the other one. Dec 23, 2019 · #1---Head Flow Charts & Comparisons : 12/23/2019: There are enough flow numbers on our website to keep everyone busy for a while. More details and photos on the test only in Muscle Mustang & Fast Fords These heads were used during the '60s and '70s on various performance engines. Detailed Description: ProMaxx Maxx 317 Chev BB Aluminum Heads Made right here in the USA. Speedmaster has become a leader in its field, built on a long term consistency of being a specialist in aftermarket automotive components. 00 BES Racing Engines now offers complete cylinder head packages. Basically its the 58cc combustion chamber(on 305 heads) vs 64-76cc chambers on 350 heads, with slightly different runners sizes. #1---Head Flow Charts & Comparisons : 12/23/2019: There are enough flow numbers on our  ProMaxx, Shocker 225 Full CNC Ported Chev SB Aluminum Heads, 225/64cc, Straight Plug, Assembled, Hyd. Jul 12, 2012 · The flow numbers indicate even more potential with these heads, since the flow numbers peak at 0. The heads offered in this sale arebareas pictured below. Feb 19, 2015 · 383 Stroker Engine 490Hp ProMaxx 200 cylinder heads Scott Farrell's Chevy 383 Stroker w/ Howards Roller Cam ProComp 210 heads ProMaxx SBC 247cc/ 319 CFM Conclusion Find PROMAXX Performance Cylinder Heads and get Free Shipping on Orders Over $99 at Summit Racing! Brand / PROMAXX Performance. 94 / 1. Feb 14, 2019 was wondering if anyone is using the head, flow numbers, hp ect on the 454- 475in But could possibly be the same casting as the Promaxx. 600 inch lift while utilizing a 4. PROMAXX Performance Products specializes in all types of automotive cylinder head for any budget, carrying Performance cylinder heads, diesel cylinder heads and stock replacement cylinder heads. The flow figures delivered in test number-4 are more than enough to make a 12. Aug 19, 2017 · I want to know if swapping to Promaxx Maxx series 183cc would be good for my application and what kind of gains I might see. 572 BBC-ProMaxx Heads Big motors make big power, and nothing thumps out power like a big-block Chevy, except an even bigger one. Mid-range to 7,000 RPM. With many years of testing, ProMaxx Aluminum Cylinder Heads have multiple advantages over the factory style cast heads such as increased flow, increased  With many years of testing, ProMaxx Aluminum Cylinder Heads have multiple advantages over the factory style cast heads such as increased flow, increased  Chevy High Performance used these to build their 675 hp 496. All flow numbers for DRD Racing Heads come from their Web Site updated Aug. Small Block Chevrolet (SBC) Cylinder Heads available in a large range of valve sizes to suit 185cc, 190cc, 195cc, 215cc & 225cc Intake port volumes to either a 64cc or 72cc Exhaust port volume. Help is just a click away! The "gap between the chambers" is the same on a 350 and a 305. 05 intake and 1. 400-inch valve lift flow numbers. The only . We previously ran these ProMaxx heads on a smaller 347 stroker, but with 210cc intake ports (that flowed over 320), the heads were better suited to a larger, more powerful stroker combination. 7K likes. lbs. Heads are "econo" ported by Speier Racing Heads. The second problem is the material there made of. 183cc Intake Runner. ProMaxx Performance Products, LLC, Rainbow City, AL. 030-inch bore on the flow bench. This item is not sold as a pair, this is a single cylinder head. If they are TBI heads, they wont flow for crap! Online shopping for Cylinder Heads - Engine Parts from a great selection at Automotive Store. , with 75 ft. Some of the heads with large flows and big runners are not going to be good street heads, since they will have slow flow through the runners at street rpm. 5 and i got exactly the same flow numbers with std valves 3-angle job, cleanin up tunners and valve back cut 30dec. Every head is ported to the customers needs which doesn't neccessarily give you the most flow out of the heads. -lbs. I run unported 351C-2V heads on a mild 87 octane build in my '31 coupe. Develped for high power Ford 302 - 351 Windsor street/track hydraulic roller applications. C Automotive also offers early 289, early 302, E7, and 351 W heads. In the final analysis street performance is not just about huge flow numbers and port volumes. promaxx sbc heads flow numbers