Promaxx project x 215. Jan 25, 2020. Dyno results show 20 to 35 hp gains over the competition. Don’t let the size fool you, flowing over 260 cfm, this head makes real power. Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Rectangular Exhaust Port Shape 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. 700 lift, 1050 QF carb 743@5300 and 851@7300. S F said: You have no credibility as an engine builder but you're definitely an expert on BS. 300 valves. Answered by: jshook Date published: 2023-05-02 MAXX 290 BBC. The current 306 in the same car makes 555 hp on Produces out of box performance that out performs the top brands in the industry. MAXX 225 SBC(Sold in Pairs) MAXX 225 SBC. The 185cc series 1 heads are perfect for that budget build. max lift for hydraulic roller camshafts. 060 over I did was to run mid to low 11’s. 60/60cc. ProMaxx Project X 9216A Aluminum Cylinder Heads Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise Angled spark plug holes angle use a 14mm . (Sold in Pairs) $ 1,415. I also show many other things with the two heads like flow numbers, cc, and measurements. This combined with our 5 angle competition valve job, diamond Oct 15, 2018 · 3010 posts · Joined 2006. (Sold in Pairs) $ 1,564. 6,069 likes · 12 talking about this · 9 were here. The first stock block 302 to run 4's, uses Promaxx Shockers. 03 REV valves 63cc re-shaped chamber Re-shaped ex ports I have a cnc program for these now which I Find 1992 CHEVROLET 5. The Maxx 171 SB Mopar heads have finally given SB Mopar enthusiasts a choice. Showing all 13 results PROMAX HEADS CHEV SB 215/64 PROJECT X Part Number: PM9217A $ 3,639. MAXX Series Aluminum Cylinder Heads. 750-inch-thick deck, it has the raised valve cover rail, and is milled so you ProMaxx 9219TA Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, Titanium valve spring retainers, Viton valve seals, 3/8 in. The economical "As-Cast" aluminum versions Jan 15, 2022 · 6492 posts · Joined 2015. 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 torque you need for the street or strip. Dec 16, 2019 · To that end, ProMaxx has two unique cylinder heads on display which are far from cookie-cutter. His name is Mark Miller. 00 Select options. 575" lift), 3/8" screw-in studs and guide plates. 900-inch bore,” says Collins. There is no comparison in the market. Pauline, SC. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting Jan 8, 2024 · PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 92198S Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 215cc Intake Runner, Chevrolet, Small Block, Pair Part Number: PMX-92198S I give the dyno results of testing many different manifolds with the Promaxx Project X 215cc heads. reach spark plug such as Autolite AR3934 (sold separately) or equivalent The Shocker CNC Series is our top of the line performance cylinder head. 00 – $ 1,540. This head will support big power at a price that can’t be beat. I also have 4. An As Cast head that is just as efficient as competition’s CNC ported pieces. Series One 185 SBC (Sold in Pairs) $ 830. Diamond honed guides. 700 Max Lift Solid Roller Springs (Pair) $2,262. May 7, 2022 · 53 posts · Joined 2021. 00 – $ 1,512. max lift for hydraulic flat tappet camshafts or . reach spark plug such as Autolite AR3934 (sold separately) or equivalent. Spring Options. 08/1. Large Spring pockets. The rub for me is what is enough to be “fun” these days. 47. So like most heads are making 320-350 hp with the cam I am stuck with. ProMaxx Project X 9216S Aluminum Cylinder Heads Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise Straight spark plug angle uses a 14mm . It did that and pissed off the yuppies at the track perfectly. Jul 23, 2022 · AFR Enforcer 185 VS Promaxx 180's. I think both could benefit with a tulip shaped exhaust valve like arf designed the ports for. 00 – $ 1,565. Jun 28, 2022 · I review promaxx project x 185cc head and flow it. 00 PROJECT X SBF 210 2. Peak power was raised by 171 hp and occurred 1,400 rpm higher, while peak torque jumped by 51 hp and occurred Series One 185 SBC (Sold in Pairs) - PROMAXX Performance Products. 3/8'' Rocker Arm Studs. 500 in. 315cc FloTec heads. Independent flow bench testing shows over 400 cfm with 2. 60cc Combustion Chambers. Oct 28, 2019 · ProMaxx Performance 9186S - Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (185cc) (1) $1,287. SaveShare. 600 inches of lift. Hydraulic flat tappet off the shelf cam, long tubes and Victor JR with a carb. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting, precision machining, and an array of ProMaxx 9215S Project X Aluminum Cylinder Head Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise Straight spark plug angle uses a 14 mm . 700 in. Buy quality auto parts in-store or shop online today. Started with the "210" ProMaxx Project X casting. 250" hyd. 700 SOLID ROLLER SPRING: $1,833. Find 2002 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Exhaust Valves Included, Solid roller Camshaft Style 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. The economical "As-Cast PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. Steel Retainers. 383. This head has produced over 550 hp on pump gas and mild cam . S. ProMaxx 9208 Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. 60 x 5. ) 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 Find PROMAXX Performance Project X Small Block Ford Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! 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 Nov 3, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. Fully CNC’d runners and chambers designed and ported in the USA. The MAXX Series is taking the affordable performance cylinder head to the next level. We are fellow Americans, and that's an association that means more to me than any other. It not only out performs the competition; it is at a price that Mopar owners cannot believe. reach spark plug such as NGK R5671A-7 (sold separately) or equivalent. The economical "As-Cast" aluminum versions feature ultra 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. The new swirl designed chamber is the difference. So I started looking into them. Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Assembled Cylinder Head Style, Angle Spark Plug Style 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. 880 valves, 13. Discover a Collection of promaxx project x 215 at Temu. Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), 66cc Exhaust Runner Volume (cc), Square Exhaust Port Shape, 0. rocker arm studs, and guide plates Valve springs for use with a Solid roller camshaft with a maximum valve lift of . MAXX quality and MAXX performance at minimum pricing - ProMaxx Performance. This head will make your SBF come to life. 600 in. Jan 27, 2020 · 7,541. (Sold in Pairs) $ 937. 505 BBC. Throats sized and SSR polished, 2. Estimated Ship Date:May 29, 2024if ordered today. shoot for maybe 500 crank hp, rev to 6800-7000, single plane intake, 4150 holley 750DP. " - The late John McCain. 00 – $ 2,016. 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. Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 185cc Intake Runner, Chevrolet, Small Block, Pair. Assemblies include 2. Promaxx Performance continues to evolve with the Project X lineup and has raised the bar on the competition. Flow Data @ 28″ water. Oct 27, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. 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. rocker arm studs, and guide plates Valve springs for use with a hydraulic flat-tappet camshaft with a maximum valve lift of . Nov 22, 2022 · I ported the SBC Promaxx Project X 215cc head. Free Shipping. Location. 00 – $ 1,964. Project X SBF 185 (SOLD IN PAIRS) $ 1,229. 7-1, Ported Sniper JR, 268 cam, under . ) 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 Find 1983 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Angle Spark Plug Style 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. Compare to any brand, this head makes power! 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. Porting is equivalent to other companies more expensive port work. 6 Angle Plugs Hyd Roller Cam Spring 600 Max Lift from 1st Autoparts. Small Block Ford (SBF) Cylinder Heads in a 5 angle 2. 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. 45 mcsa @ pushrod pinch 2. 600" Max Lift Hydraulic Roller Springs. (Sold in Pairs) $ 864. 00 – $ 2,237. They have been on track tested weekly in a dirt late model. Filter by: Cylinder Heads Alloy. 02/1. 10 x 5. (Sold in Pairs) $ 950. The 200cc looks pretty good too. GM Vortec Cylinder Heads in a 185cc/64cc available in bare or assembled. The Maxx 290 is truly a rare breed in today’s market. Run with the ProMaxx heads, the 393 stroker produced 558 hp at 6,400 rpm and 512 lb-ft at 5,000 rpm. 00 – $ 2,085. Contact information: weingartnerracing@gmail. 6 days ago · ProMaxx 9196A Project X Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. Last little 289 . I have been working on a set of "ProMax" cylinder heads for the past number of weeks. Those promaxx 215s make 427 hp. Oct 1, 2019 · Both Flotek and Promaxx can make big power as well. 700″ lift. ProMaxx Performance Products, LLC, Rainbow City, Alabama. The Shocker 225 CNC is the ultimate 23 degree small block Chevy head. 575 in. Part Number:PMX-9186S. As-Cast. Put track tested performance in your small block Ford at a price that Find PROMAXX Performance Cylinder Heads 225cc Intake Runner Volume (cc) and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Nov 2, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. Dec 8, 2022 · Selling a SB Ford project I've been working on for a while. PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 9186S. Assemblies feature 21-4N Stainless 1 pc Swirl polished back cut valves, studs and guide plat. 6/58CC 5 Angle Valve Job Assembled . 750 in. The series 1 175cc SBF is an economical head that has all the right stuff. 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 ProMaxx Performance 9175 MAXX Series Aluminum Cylinder Heads for Ford Small Block. Project X SBF 210 Dec 15, 2023 · ProMaxx 9218S Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. The economical "As-Cast" aluminum versions feature ultra-smooth Find 1991 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Angle Spark Plug Style, Retainers Included 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. This is the results and some insights. 020"/1. Chamber unshrouded. 10 gears, TH350 and stock 31" tires. reach spark plug such as Autolite AR3934 (sold separately) or equivalent Mar 21, 2023 · Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), 66cc Exhaust Runner Volume (cc), Rectangular Exhaust Port Shape and get Free Shipping on Orders Over $99 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. 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. Nov 3, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. I see the have a. Uses a 14mm . ProMaxx 9185S Project X Aluminum Cylinder Head Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise Straight spark plug angle uses a 14mm . The final touch was an MSD distributor and ignition amplifier. The Maxx 200 is the ultimate “as cast” head available that produces CNC type flow number, flowing over 280cfm. The flow numbers seem better than vortecs. Find 1992 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Rectangular Exhaust Port Shape 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. reach spark plug such as Autolite AR3934 (sold separately) or equivalent PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. The economical "As-Cast" aluminum versions feature ultra Heads include chromoly retainers, hardened locks, 5-angle valve job, diamond-honed guides, and high performance valve springs capable of supporting . This head will change the industry. Been building combos for my cj7 sbc swap this year Promaxx project x 215cc heads make 20-30 hp more then any other aluminum head combo I’ve sim’d so far. 6/60cc Pro Designed Full CNC Port and Chamber 5 Angle Valve Job Fully Assembled with Stainless Valves, 7/16 Studs, Guide Plates and . 00 – $ 1,431. #1. 180 cc Intake Ports. Intake Valve Diameter (in. Find 1992 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc) 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. There are some sbc heads right now that are some monsters. Wondering if they would be better than my Hand Bowl Blending. Feb 5, 2024 · ProMaxx 9206 Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. From fashion to home decor, handmade crafts, beauty items, chic clothes, shoes, and more, brand new products you love are just a tap away. Jan 17, 2024 · ProMaxx 9205 Project X Aluminum Cylinder Head Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise. . rocker arm studs, and guide plates Valve springs for use with a hydraulic roller camshaft with a maximum valve lift of . All PROMAXX Performance Maxx Series big block Mopar cylinder heads have the bowls blended by hand, and are assembled by professional builders. It features professionally designed runners and chambers meticulously CNC ported in the U. 00. The economical "As-Cast Oct 28, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. com wengine PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 9198TA Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 200cc Intake Runner, Chevrolet, Small Block, Pair Part Number: PMX-9198TA PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. 0L . It requires no special components. I don't know where these are really produced and I'm not going to guess. The ProMaxx 723-2151 has cam specs of 575 in. The SBF Maxx 180 is an as cast head that beats the competition. X series with 185 intake runners. Series One 175 SBF(Sold in Pairs) Series One 175 SBF. 00 – $ 1,525. ProMaxx Project X 9197A Aluminum Cylinder Heads Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. A. It puts out up to 20 hp over the competition. I looked at Promaxx heads, but finally bought the Blueprint H8002K heads, which are about the same price. Feb 12, 2024 · ProMaxx 9215A Project X Aluminum Cylinder Head Features: Cast from 356-T6 ultra-smooth aluminum with larger valve spring pockets and runners designed to be both accurate and precise Angled spark plug holes use a 14mm . #1 · May 7, 2022. (Sold in Pairs) $ 1,609. 7L/350 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc) 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. 200cc intake runner. Shocker 225 SBC CNC(Sold in Pairs) Shocker 225 SBC CNC. “It has an LS3 runner that will fit on a 3. with . 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. Anyone running them or any promaxx sbc head that they could give some input on. rocker arm studs, and guide plates Valve springs for use with a solid roller camshaft with a maximum valve lift of . 00 – $ 2,580. Maximum quality, maximum performance, and minimum pricing--PROMAXX Maxx Series SBC cylinder heads take affordable power to the next level. I have standard dished pistons in a GM crate 350, so it limited the compression ratio I could achieve. "Despite our differences, much more unites us than divides us. New Zealands premier auto parts SHOP 45 Rennie Drive, Mangere, Auckland Oct 27, 2023 · Just wondering what opinions are on promaxx project x heads? I think they are afr copies, but that 215cc head looks very promising. Performance Cylinder Heads Locally Owned and PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. View Add to cart. ProMaxx. The economical "As-Cast" aluminum Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), 2. Maxx 200 SBC(Sold in Pairs) Maxx 200 SBC. the promaxx heads are 1300 shipped to my door with the 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. 01/1. PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 9215A Cylinder Heads, Project X, Aluminum, Bare, 64cc Chamber, 215cc Intake Runner, Chevrolet, Small Block, Pair Part Number: PMX-9215A Jul 26, 2023 · Shocker SBF 210 2. Not Yet Reviewed. 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. 080 in. The economical "As-Cast" aluminum Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 64 Combustion Chamber Volume (cc), 215cc Intake Runner Volume (cc), Square Exhaust Port Shape, 0. 300/1. At PROMAXX, we provide our elite series at prices that make our competition cringe. 600" stainless steel valves, performance valve springs (1. 800 in. Project X SBC 215 (Sold in Pairs) $ 1,114. 00 Jul 23, 2023 · I tell the dyno numbers from the two different heads. 02'' Intake / 1. #10 · Jan 16, 2022. The economical "As-Cast" aluminum versions feature ultra-smooth PROMAXX Performance Project X Small Block Ford Cylinder Heads. 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. Maximum Valve Lift (in. “It’s got a . 2010 - Cast Aluminum Cylinder Find 1996 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc) 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. Saw a video review on YouTube about a promaxx head. Will make over 500 hp in a pump gas 383. Ford 6. Maxx 190 SBC(Sold in Pairs) Maxx 190 SBC. The economical "As-Cast" aluminum versions feature Maxx 180 SBF(Sold in Pairs) Maxx 180 SBF. #9 · Oct 16, 2018. hot rod magazine were pretty happy with the 180cc version on a milder sbc they built Promax Heads Chev Sb 215/64 Project X Valve 2. Machined and assembled in the USA. (Not 210cc) 211cc re-shaped intake port 2. The first is an LS3 head, designed to work on small-bore engine combinations. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting Find 1996 PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 64 Combustion Chamber Volume (cc), 215cc Intake Runner Volume (cc) 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. I remember in my late teens thinking running high to mid 12’s was all I wanted. Find PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 215cc Intake Runner Volume (cc), Angle Spark Plug Style 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. Making great power at a price that cannot be matched. FT up to . Unlike most of our competitors, we don’t offer different quality CNC designs. Contact info:w Aug 2, 2022 · I give an honest review of the Promaxx Project X 215cc head. ) 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 Sep 21, 2023 · Depends on heads. Precision designed Runners. PROMAXX Performance Project X small block Chevrolet cylinder heads have the right stuff to perfectly fit your budget build with abundant power. Maxx 171 SB Mopar(Sold in Pairs) Maxx 171 SB Mopar. . 2. 60'' Exhaust Valves. The Maxx 225cc SBC head is our largest “as cast” head in our line up, flowing close to 300 cfm @ . Nov 4, 2023 · Re: Promaxx project x heads. ), Square Exhaust Port Shape, 0. reach spark plug such as Autolite AR3934 (sold separately) or equivalent Sep 6, 2017 · Feeding the high-rpm, single-plane was a Holley 950 Ultra XP carburetor. Speedmaster PCE281. (Sold in Pairs) $ 979. qx zk hz rn bt as gl re oz bs