Promaxx heads sbc. 300 valves. FREE Shipping. This head was made thicker than OEM specs for better quality. You can cut a man's tongue from his mouth, but that does not mean he’s a liar, it just shows that you fear the truth he might speak about you! Monza355. The 64cc chambers will increase the compression on a stock LS1 from 10-1 to 10. MAXX 290 BBC. 52 intake valve. Get the Best Performance with ProMaxx Performance HEAD MAXX SBC 225 ST ASSM 2123SRT parts at Items You May Also Consider. PROJECT X SERIES LS XXTREME SERIES SHOCKER SERIES MAXX MAXX 170 Ford FE(Sold in Pairs) MAXX 170 Ford FE. Free Shipping - PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads with qualifying orders of $109. 200 Series Aluminum Cylinder Heads. Freedom SBC 190cc CNC Blended 2. /64cc Angle Bare. PROMAXX Performance Shocker Series small block Chevy cylinder heads are as good as it gets for 23-degree performance heads. Part Number: 9183 Categories: SBC, MAXX SERIES. Valve Angle: 23°. 3:1). Mar 9, 2016 · Or Promaxx 200 Series Aluminum Cylinder Heads Small Block Chevy As-Cast 200cc Intake Ports 64cc Combustion Chambers 2. There is no other choice for your FE. Straight Plug. ( 1 ) Estimated Ship Date: May 8, 2024 (if ordered today) Free Shipping. Intake Runner: 185cc. Kicking around cylinder head options for my 351w project, which head is better for a stock displacement pump gas 351? Won't spin it past 6000rpm, want good torque and midrange. PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads 2170 Cylinder Heads, Aluminum, Assembled, 72cc Chamber, 185cc Intake Runner, Angle Plug, Chevy, Small Block, Pair Part Number: PMX-2170 Product Q&AView Now. 185cc Aluminum Small Block Chevy Cylinder Heads. 200cc Intake Ports. At PROMAXX, we provide our XXTREME series at prices that make our competition cringe. 60'' Exhaust Valves 3/8'' Rocker Arm Studs. Diamond honed guides. Whether you are looking for a se PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. Machined and Assembled in the USA. ProMaxx 9200 SBC. Maxx cylinder heads feature 5-angle competition valve jobs, diamond-honed bronze guides, and hand bowl blending. The 185 Vortec has taken the Vortec head to the next level. There is no comparison in the market. Exh. This is an all new casting, with incredible build quality for the price. Our new ultra smooth casting made of Grade A 356-T6 aluminum is precision CNC machined to create the perfect platform for our new runner and chamber designs. 58. Shop Now at the Guaranteed Lowest Price! Save $5 off $49+, $10 off $99+, $30 off $299+, $50 off $499+ Orders* - Use Promo Code: Spring Jun 4, 2023 · Besides, in this case, the 2. This head will change the industry. They feature ultra-smooth 356-T56 aluminum casting, and professionally designed runners and chambers that are meticulously CNC-ported. PROMAXX Performance Project X small block Ford cylinder heads are one word—awesome! They feature ultra-smooth 356-T6 aluminum casting, 5-angle valve jobs, precision CNC machining, and diamond-honed bronze guides and can make big power in your small block Ford application. Weight - 55. 6 days ago · Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (200cc) 9196A parts at JEGS. Valves w/8mm Stems. Valve Spring Lift - . 08'' Intake / 1. Even the ''as cast'' heads utilize ultra-smooth new runner and chamber designs that produce ''CNC'd type'' flow numbers. Small Block Ford. Our new 195cc SBC Enforcer cylinder heads are a budget friendly offering that is available as a “No Parts” head or can be ordered fully assembled with the same great components found in our higher end cylinder heads; such as ARP rockers studs, PAC Racing springs, AFR adjustable guide plates and our Stainless Steel valves. $5 Off Your $100 Mobile App Purchase - Get the App ProMaxx Performance Cylinder Heads available: Big Block Chevrolet (BBC) Cylinder Heads available in 320cc & 360cc at different valve sizes. Popular with street/strip enthusiasts and Circle Track racers, PROMAXX designed these heads to work well on 350-383 applications. Compare price, Compare Quality, Compare performance. Kit Includes:ProMaxx Performance 185cc Aluminum Cylinder Heads -723-2169JEGS. Has a summit 1107 camshaft. Assembled. Our custom 5 axis CNC machined GM castings make these heads a must have for any performance oriented GM LS series engine. Will be going in a full weight 1978 Z28 with M21 for my wife to drive. ProMaxx Maxx Series Chevrolet Small Block Aluminum Heads Made right here in the U. Add to cart. They also offer these heads bare. Feb 12, 2015 · My ProMaxx Maxx 200cc sbc heads arrived. The Maxx 290 is truly a rare breed in today’s market. (Sold in Pairs) $ 1,330. 00 lbs Intake Runner - 225cc Exhaust Runner - 62cc Intake Valve Size - 2. Jul 13, 2021 · 406 SBC head recommendations. Pauline, SC. the 2. so maybe this is old news but promaxx apparently acquired the company that acquired patriot cylinder heads, which made very economical high performance aluminum cylinder heads here in the USA, they also CNC machine stock heads in addition to making their own castings for big blocks, small blocks and small fords. S. shoot for maybe 500 crank hp, rev to 6800-7000, single plane intake, 4150 holley 750DP. 575'' lift (hyd. Porting is equivalent to other companies more expensive port work. Shop Now at the Guaranteed Lowest Price! Save $5 off $49+, $10 off $99+, $30 off $299+, $50 off $499+ Orders* - Use Promo Code: Spring Jul 23, 2022 · AFR Enforcer 185 VS Promaxx 180's. So make your own conclusions. They're machined from high-quality aluminum and most come assembled with the finest parts (bare heads are also available). Throats sized and SSR polished, 2. 5:1 (or a little bit higher) with whatever cam you use. (Sold in Pairs) $ 1,564. I had sent them my parts to assemble them. Mar 18, 2015 · 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. Expert. 00 – $ 2,029. Estimated to ship direct from manufacturer on 06/06/24, pending manufacturer availability. 600" max lift valve springs, and steel retainers. 700 lift, 1050 QF carb 743@5300 and 851@7300. I have the 200cc heads from him and they have been great . The MAXX Series is taking the affordable performance cylinder head to the next level. 315cc FloTec heads. 155 piston, 1/16, 1/16, 3/16 rings. Will make over 500 hp in a pump gas 383. 225 Series Aluminum Cylinder Heads. Flows 276 at . These heads out flow the competition at a price that cannot be touched. I have 1 3/4 long tube headers and rpm intake with spacer and a Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc) 9217S parts at JEGS. 750 Reach. Maxx183's flow a little better at lower lifts, but they are pretty equal at . Nov 30, 2015 · Promaxx bought Patriot, and sells them still as their "Freedom" series. 00) 1x Project X SBC 185. Technical Specifications and Recommended Components: Combustion Chamber - 64cc. They showed up assembled with their parts. Get the Best Performance with ProMaxx Performance Project X Bare Aluminum Cylinder Heads for Small Block Chevy (215cc) 9215S parts at JEGS. Maxx 190 SBC(Sold in Pairs) Maxx 190 SBC. 225cc Aluminum Small Block Chevy Cylinder Heads. Bigger runner and bigger valves mean more power! Just ask dirt track racer Shawn Guffey, who has won every race and back to back track championships since installing Vortec heads on his A Hobby ride. Features. Technical Specifications and Recommended Components:Combustion Chamber - 64cc Weight - 55. Chamber unshrouded. While creating the 100% CNC Ported MAXX series, Many long hours on the Project XSeries. It requires no special components. The Maxx 317 is truly a rare breed in today’s market. The ProMaxx Performance heads promised two things we love: plenty of flow and affordable pricing. These PROMAXX Performance Freedom Series rectangular port 320cc intake runners with hand-blended valve bowls are good for the street or strip. Shop Now at the Guaranteed Lowest Price! JEGS Friends & Family Sale - Save Big on 10,000+ Products Jul 2, 2020 · Details. 08/1. 60 in. 00. This option is NOT available w/ bare heads. Seats Installed for: 2. Part Number: PMX-2150. Some comparable heads are double the cost of one Shocker 340 CNC. MAXX 317 BBC(Sold in Pairs) MAXX 317 BBC. Shop Now at the Guaranteed Lowest Price! Save $5 off $49+, $10 off $99+, $30 off $299+, $50 off $499+ Orders* - Use Promo Code: Spring Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (200cc) 9197A parts at JEGS. 08" Exhaust Valve Size - 1. Max. (Sold in Pairs) $ 979. BIG difference. Forged internals. 58cc chamber and 1. View Details. (Sold in Pairs) $ 2,367. 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. $937. The 185cc series 1 heads are perfect for that budget build. The Ford FE Maxx 170 has made upgrading or reviving your FE motor affordable. 02 in. 600; Hand Bowl 2 days ago · Maximum quality, maximum performance, and minimum pricing—PROMAXX Maxx Series SBF cylinder heads take affordable power to the next level. Sporting no less than 572 cubes, this BBC stroker needed plenty of airflow to feed all those extra inches. Mar 6, 2021 · I just built a 355 with ProMaxx Maxx 183 heads. Intake Valve Size - 2. Taking the affordable performance cylinder head to the next level. 00 Select options. 200cc intake runner. $895. These heads are very ch Jul 22, 2014 · Jul 22, 2014. 1996-2002 Models: Truck Engine Size: 5. above 8K rpm to make good usage of 225 CC SBC heads. From Chads site. Will be hyd roller with cam TBD and running AFT Titon dual-plane ProMaxx Performance Small Block Chevy Vortec 185cc Cylinder Heads feature an all-new cast iron casting. Get the Best Performance with ProMaxx Performance 183 Series Aluminum Cylinder Heads Small Block Chevy Angled Plug 9183A parts at JEGS. A. Going fast doesn’t have to break the bank, so get a pair of XXTREME Series Heads today. The Shocker CNC 340cc BBC is a professional designed cylinder head using the latest CNC porting tools. $5 Off Your $100 Mobile App Purchase - Get the App Feb 22, 2022 · I just stumbled across the ProMaxx "Project X" SBC heads on Summit's site. 210cc Intake Ports. 88" exhaust valves, 7/16" rocker arm studs, . Get the Best Performance with ProMaxx Performance 183 Series Aluminum Cylinder Heads Small Block Chevy Straight Plug 9183 parts at JEGS. Spark Plug: 14mm . $1,792. Performance. Maxx 180 SBF(Sold in Pairs) Maxx 180 SBF. Jun 28, 2022 · I review promaxx project x 185cc head and flow it. Intake Runner: 210cc. These assembled PROMAXX 320 BBC aluminum cylinder heads for 1966-2000 big block Chevy V8 engines will help you shave weight on a budget. Maximum quality, maximum performance, and minimum pricing--PROMAXX Maxx Series SBC cylinder heads take affordable power to the next level. Had XVT stamped on them. The Shocker 225 CNC is the ultimate 23 degree small block Chevy head. Flowing over 328 cfm through only a 210cc runner will make the power you need from your big cubic inch small block Ford. Jan 25, 2020. This is the first set of this brand I have had to work on so I thought I would make public some of my findings. 5-1. (Sold in Pairs) $ 1,601. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting, precision machining, and an array of assembled options, as well as being available bare. 880 valves, 13. ProMaxx has taken their "As-Cast" Maxx Series 220cc heads, performed their 5-angle valve job, and Bowl Blend to promote flow on this head. Go out and shock the competition. 00 – $ 2,879. Yes (+$ 20. (Sold in Pairs) $ 1,792. The heads feature one 2 days ago · What Are The Top ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads? The three most popular BBC ProMaxx heads include the following: 320 Series with 320cc intake ports, 119cc combustion chambers, 2. Angle Plug. Subtotal $925. Series One 185 SBC Cast Iron (Sold in Pairs) $ 822. Shop Now at the Guaranteed Lowest Price! JEGS Friends & Family Sale - Save Big on 10,000+ Products Product images may differ from actual product appearance. 30" intake / 1. Cylinder Heads, Cast Iron, Bare, 64cc Chamber, 185cc Intake Runner, Straight Plug, Chevy, Small Block, Pair. Flowing over 325 CFM these heads will support big cubic inch and big horse power easily over 725 horsepower. Feb 12, 2022 · I review and flow a SBC ProMaxx 200cc head. No longer are you stuck with one real option. We have designed a complete new line of performance heads that meet or exceed the big names in the industry. Forged flat top pistons. 60''. Dec 13, 2019 · While at the ProMaxx Performance booth at the 2019 PRI Show, we learned this cylinder head company has options for everyone. Compare performance and price and you will see it is no contest. flat tappet) springs, steel retainers, 3/8'' studs, bronze ProMaxx Performance 2120 - 225cc Aluminum Cylinder Heads Sm (3) $1,197. Upgrade Rocker Arm Studs to a 7/16″. Series. There is NO AS CAST head on the market that can outflow these heads PERIOD! We have done our homework and produced what we believe is the best as cast head-on at an affordable price. Oct 15, 2018 · 3010 posts · Joined 2006. 02". Spark Plug=Angle Plug. Small Block Chevy. Spark Plug: Straight. I have been working on a set of "ProMax" cylinder heads for the past number of weeks. Perfect for Street, Strip, or Oval Track Applications, these heads are machined with large diameter spring pockets to handle higher lifts than stock while being drilled for both Vortec and carbureted intake patterns. 575" Hydraulic Flat Tappet Spring Pressure Shocker 210 SBF CNC. 505 BBC. 00 – $ 1,512. Location. ProMaxx Performance Project X Bare Aluminum Cylinder Heads for Small Block Chevy (185cc) Project X Bare Aluminum Cylinder Heads. OK, we've done some of these in the past and trying to figure out the my sizing. PROMAXX Performance Vortec 185cc Iron Cylinder Heads 2150. SB-Chevy 225cc Freedom Series Heads. This is NOT that cylinder head. They're available bare or assembled; both feature screw-in studs and large diameter spring pockets. the promaxx heads are 1300 shipped to my door with the . 1x Maxx 183 SBC. Intake Ports: 185cc. Combustion Chambers: 64cc. Ultra smooth casting made of Grade A 356-T6 aluminum is precision CNC machined creating the perfect platform for new runner and chamber designs. Bare, 2/pkg. (Sold in Pairs) $ 937. With ultra-smooth Grade A 356-T6 aluminum castings that are precision machined, these small block Ford heads deliver awesome air speeds with super-efficient chamber designs to produce the power and torque you've sought for your setup. Click image to zoom. 60" Max. Exhaust Runner - 72cc. Large Spring pockets. The absolute best CNC value PERIOD. I bought them complete for $875 from jegs. Estimated to ship direct from manufacturer on 03/25/24, pending manufacturer availability. $1,022. Lowest Price Guarantee. Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Ford (210cc) 9208 parts at JEGS. /1. The 190 SBC is our 183cc runner head that has been CNC ported to match a 1206 Felpro gasket to pick up flow numbers for that little extra. 02'' Intake / 1. The Shocker 210 CNC SBF heads are tops in the industry. The whole thing is a joke complete with requisite dyno disclaimer. I have standard dished pistons in a GM crate 350, so it limited the compression ratio I could achieve. Promaxx Performance continues to evolve with the Project X lineup and has raised the bar on the competition. This combined with our 5 angle competition valve job, diamond Series One 185 SBC (Sold in Pairs) - PROMAXX Performance Products. I also have 4. The current heads are the old school powerpack heads which from what I've read yield a 138cc intake runner. This is a cast iron direct bolt on replacement for your 906 -062 engine. 00 – $ 1,911. 64cc Combustion Chambers. Free Shipping - Estimated to ship direct from manufacturer on 03/29/24 , pending manufacturer availability. $1,415. 5 angle competition valve job, diamond honed bronze guides, hand bowl blending and assembly by Jan 27, 2020 · 7,541. They sent my parts back to me so I am goin to assemble them myself but I did get them for $815 with their valves. Engine runs great and not looking for new heads, but I was looking at the AFR 195 Enforcer heads. 00 – $ 3,683. They are cast of high quality A-356-T6 aluminum, and have approximately 3/4" thich decks. Price is about the same as Profiler used to be Dec 1, 2016 · 572 BBC-ProMaxx Heads Big motors make big power, and nothing thumps out power like a big-block Chevy, except an even bigger one. Use 195cc heads for up to 6250 rpm. 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. Valves are REV valves. Series One 185 SBC (Sold in Pairs) $ 830. 00 lbs. Precision designed Runners. 500. 60". 406 Gm block, Scat 3. Compare to any brand, this head makes power! Series One 185 SBC Cast Iron. Cylinder Head Options. 6 valves. Some parts are not legal for use in California or other states with similar laws / regulations. Exhaust Runner - 62cc. PROMAXX Performance Project X Small Block Ford Cylinder Heads. Jan 12, 2021 · First off if your motor is only 355 cid, or even 383 cid you will need to be buzzing it well . Take your PROMAXX Performance goes one up with their Vortec 185cc iron cylinder heads. 64cc Combustion Chamber. Dyno results show 20 to 35 hp gains over the competition. 00 – $ 1,431. 02" Intake / 1. #1. hot rod magazine were pretty happy with the 180cc version on a milder sbc they built I review and flow a Promaxx Project x 200cc head. Machined and assembled in the USA. Someone messed up. Other thing is, the 317 ProMaxx is a copy of the American AFRbeing compared to the AFR Enforcer which is a generic "everyone sells one" inferior Chinese BB Chevy head. Part Type: Cylinder Head Application: ProMaxx Maxx Series Chevrolet Small Block Cylinder Head Material ProMaxx Performance Freedom SBC 190cc CNC Blended 2. Flow Data @ 28″ water. Performance Cylinder Heads. The ProMaxx MAXX Series Small Block Chevy Aluminum Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. ProMaxx Performance designed/developed this cylinder head from from the GM 906-062 Vortec factory casting. 300/1. Flow Chart. 00 – $ 2,580. Spring Options. $1,193. The XXTREME Series is our newest line performance cylinder head. Technical Specifications and Recommended Components: Combustion Chamber - 72cc. 7-1, Ported Sniper JR, 268 cam, under . 00 – $ 2,500. Get superb out-of-the-box performance, without emptying your wallet, when you order PROMAXX Maxx Series small block Ford cylinder heads. 171cc Intake Ports. 7L V8 Cast #: 906, 062 Maxx 190 SBC (Sold in Pairs) $ 937. Cast Iron Small Block Chevy Vortec Cylinder Heads. Shop Now at the Guaranteed Lowest Price! JEGS Friends & Family Sale - Save Big on 10,000+ Products Jun 4, 2015 · 185cc Aluminum Small Block Chevy Cylinder Heads. 00 – $ 1,357. 0 - 8. 63cc Combustion Chambers. #9 · Oct 16, 2018. The Maxx 200 By flowing over 280cfm through a 2. Get the Best Performance with ProMaxx Performance 190cc Aluminum Cylinder Heads Small Block Chevy [Hydraulic Roller, 64cc Chamber] 2181HR parts at JEGS. Shop Now at the Guaranteed Lowest Price! JEGS Friends & Family Sale - Save Big on 10,000+ Products Shocker 340 BBC CNC(Sold in Pairs) Shocker 340 BBC CNC. I had never seen them before. See more product details. 60" Exhaust Valves. An As Cast head that is just as efficient as competition’s CNC ported pieces. Part Type: Cylinder Head Application: Chevrolet Small Block Cylinder Head Material: Aluminum Oct 31, 2020 · Unless you are using a VERY mild cam, you will be able to use 64-65cc heads with flat tops on a 383 SBC (10. Jun 1, 2017 · 453 posts · Joined 2012. Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc) 9217A parts at JEGS. Small journal engine. 08 in. May 20, 2020 · This video reviews the Promaxx Performance Freedom Series aluminium cylinder head that you can buy from outlets such as Summit Racing. 00 – $ 1,565. Independent flow bench testing shows over 400 cfm with 2. Estimated to ship direct from manufacturer on 03/29/24, pending manufacturer availability. I got to looking at the advertised flow numbers for the AFR's. Learn More. For street, check dynamic compression ratio is 8. Mar 18, 2024 · Free Shipping - PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads with qualifying orders of $109. 225cc Intake Ports. 10 gears, TH350 and stock 31" tires. Project X SBC 185(SOLD IN PAIRS) Project X SBC 185. PROMAXX Performance Maxx Series Small Block Chevy Cylinder Heads 9184 Cylinder Heads, Maxx Series, Bare, Aluminum, 183cc Intake Runner, D-port, Chevy, 302, 327, 350, 400, Pair Part Number: PMX-9184 Lowest Price Guarantee. Assemblies feature 21-4N Stainless 1 pc Swirl polished back cut valves, studs and guide plat. To this they added only the highest quality 21-4N stainless valves, . (SOLD IN PAIRS) $ 1,069. Oct 1, 2019 · Both Flotek and Promaxx can make big power as well. MAXX Series Aluminum Cylinder Heads. Fully CNC’d runners and chambers designed and ported in the USA. I had vortec heads before and my car pulled way harder with the promaxx , I have 355 sbc. 25 valve vs. 210c heads for 6250+ rpm. Don’t let the size fool you, flowing over 260 cfm, this head makes real power. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting, precision machining, and an array of AFR - Airflow Research 1006 - 1006 Fully Assembled 195cc En (1) $593. Hydraulic flat tappet off the shelf cam, long tubes and Victor JR with a carb. 75 crank, 6" 4340 rods Wiseco Flat top 4. I looked at Promaxx heads, but finally bought the Blueprint H8002K heads, which are about the same price. I don't know where these are really produced and I'm not going to guess. It puts out up to 20 hp over the competition. View More. 575" Max Lift Steel Retainers The price difference isn't but maybe $100 Shocker 227 LS 1 & 2. 00 – $ 1,996. Project X. PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. Went to the ProMaxx site and checked them out, and they seem to be comparable to the Profiler All-American 210 heads. they dont have Mar 18, 2024 · ProMaxx Performance Project X Bare Aluminum Cylinder Heads for Small Block Ford (210cc) Project X Bare Aluminum Cylinder Heads. Valve Angle: 20°. The SBF Maxx 180 is an as cast head that beats the competition. This yields a great flowing 225cc runner. PROMAXX Performance Maxx Series Small Block Chevy Cylinder Heads 9183 Cylinder Heads, Maxx Series, Assembled, Aluminum, 183cc Intake Runner, D-port, Chevy, 302, 327, 350, 400, Pair Part Number: PMX-9183 2 days ago · Free Shipping - PROMAXX Performance Freedom Series Small Block Chevy Cylinder Heads with qualifying orders of $109. 02''/1. 30 is much more significant. #2 · Jun 1, 2017. Shop Cylinder Heads at Summit Racing. Int. It features professionally designed runners and chambers meticulously designed in the U. Hand Bowl Blending. Exhaust Valve Size - 1. 2. This particular version of our heads come with a 5 angle valve job, hardened seats, and bronze guides. ProMaxx Performance 2168 - 185cc Aluminum Cylinder Heads Sm (3) $1,101. ProMaxx Performance. Sold as Pair. 60IN. (Sold in Pairs) $925. Stupid comparison. 00 Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. With ultra-smooth Grade A 356-T6 aluminum castings that are precision CNC-machined, these small block Chevy heads deliver awesome air speeds with super-efficient chamber designs to produce the power and FULL DYNO RESULTS-340 PROMAXX VS 345 AFR-CHEAP VS BRAND NAME? CHECK OUT THIS VIDEO COMPARING THE FULL CNC PROMAXX 340 BBC HEADS AGAINST THE AS-CAST AFR 345 H Assembled heads feature 21-4N back cut swirl polished 1 pc stainless steel valves, 3/8 studs and adjustable guide plates Series One 185 SBC Cast Iron (Sold in Jul 12, 2020 · First off this is a 327 sbc. 100% CNC Ported. These heads flow over 325 cfm to easily support 725-plus horsepower. Intake Runner - 185cc. $5 Off Your $100 Mobile App Purchase - Get the App Find PROMAXX Performance Freedom Series Big Block Chevy Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! PROMAXX Performance Freedom Series big block Chevy cylinder heads offer exceptional quality at an unbelievable price. 30 over. Making great power at a price that cannot be matched. 02IN. As-Cast. (Sold in Pairs) $ 822. ccs. 60'' Exhaust Valve Sizes. The only thing I had to do was seat the valve seals , they didn't tap them down far enough . Flow numbers seem to be almost exactly the same as Profiler on intake, higher on exhaust. These heads provide up to a 65 cfm improvement over the stock OEM versions. Special Order. ov gk mi vc ut sw bd kv js ck