Promaxx project x heads

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185cc Aluminum Small Block Chevy Cylinder Heads. Technical Specifications and Recommended Components: Combustion Chamber - 72cc. Weight - 55.00 lbs. Intake Runner - 185cc. Exhaust Runner - 62cc. Intake Valve Size - 2.02". Exhaust Valve Size - …I just built a 355 with ProMaxx Maxx 183 heads. Engine runs great and not looking for new heads, but I was looking at the AFR 195 Enforcer heads. I had never seen them before. I got to looking at the advertised flow numbers for the AFR's. Maxx183's flow a little better at lower lifts, but they are pretty equal at .500.PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads. Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 215cc Intake Runner, Chevrolet, Small Block, Pair. See More Specifications | Check the Fit.Project X SBF 210. (SOLD IN PAIRS) $ 1,266.00 – $ 2,292.00. The Project X 210 Ford is in one word “AWESOME” over 319 cfm in an as cast head is unbelivable. This head will make BIG power in your SBF application. Our new swirl designed chamber is the difference. Couple that with a state of the art NEW casting and you have a home run. PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 91898S Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 185cc Intake Runner, Chevrolet, Small Block, Pair Part Number: PMX-91898SSeries One 185 SBC. (Sold in Pairs) $ 830.00 – $ 1,431.00. The 185cc series 1 heads are perfect for that budget build. Making great power at a price that cannot be matched. Machined and assembled in the USA. Dyno results …

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... Straight spark plug angle uses a 14mm .750 in. reach spark plug such as Autolite AR3934 (sold separately) or equivalent ...9186S: SBC 185 Assy Hyd Flat Tappet: STRAIGHT: 64: 2.02/1.6.575 Hyd Flat Tappet: 9187S: SBC 185 Assy Hyd Roller: STRAIGHT: 64: 2.02/1.6.600 Hyd Roller: 9188S ProMaxx 9206 Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates Valve springs for use with a hydraulic flat-tappet camshaft with a maximum valve lift of .575 in. ED501 Discussion starter · Mar 8, 2016 (Edited) want to run pump gas and need a cheap aluminum head. Going to get them bare for $700 and add my own 2.055/1.60 plus .200 chevy valves and comp. springs and retainers I already got,with a complete port job. Can order them with a 185 runner and seat cut for the 2.055.PROMAXX Performance Project X Small Block Ford Cylinder Heads. 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 …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-smooth 356-T6 casting, precision machining, and an array of assembled options, as well as being available bare.I review promaxx project x 185cc head and flow it.

Bogie Reply Save AutoGear · #4 · Feb 23, 2022 sounds like a ringer head. "hand blended" on manufacturer advertising might be treated pretty loosely. Reply Save BogiesAnnex1 · #5 · Feb 23, 2022 If you want big flow numbers the approach that Tony Sizemore takes at Headbytes is one way to go.This is Part 13 of my Ford 331 stroker motor rebuild.PROMAXX Maxx Series SBF cylinder heads MAXX 180cc - 9175 https://promaxxperformance.com/product/maxx-180...I have made the decision that I am going to go with Promaxx Project X 185 heads. I am impressed with the flow numbers. Does anyone out there have any experience with these heads. ... From what I have read they use to be the Patriot heads, but now are called Promaxx. Also the head gasket they recommend is the felpro 1003. Im sure it is a …Started with the "210" ProMaxx Project X casting. (Not 210cc) 211cc re-shaped intake port 2.45 mcsa @ pushrod pinch 2.10 x 5.01/1.60 x 5.03 REV valves 63cc re-shaped chamber Re-shaped ex ports I have a cnc program for these now which I ran in these heads but because of core shift, I finished the intakes and chambers by hand. Exports came out OK ...Find PROMAXX Performance Maxx Series Small Block Ford Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Maximum quality, maximum performance, and minimum pricing—PROMAXX Maxx Series SBF cylinder heads take affordable power to the next level. With ultra-smooth Grade A 356-T6 aluminum castings that are precision machined, these small block Ford heads deliver awesome ... These rectangular port iron heads from Summit Racing offered surprising bang for the buck. The Summit Racing head upgrade improved the power output of the 496 from 630 hp and 577 lb-ft to 688 hp ...

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Project X SBF 185. (SOLD IN PAIRS) $ 1,229.00 – $ 2,085.00. The Project X 185 Ford is in one word “AWESOME” over 319 cfm in an as cast head is unbelivable. This head will make BIG power in your SBF application. Our new swirl designed chamber is the difference. Couple that with a state of the art NEW casting and you have a home run. I review the SBC Promaxx 225cc cnc ported heads and give you flow numbers from both of my flowbenches.Head gasket repair can be an expensive, but necessary repair for your vehicle. Knowing the average cost of a head gasket repair can help you budget and plan for this important maintenance. Here we will discuss the factors that go into the c...Checking out a pair of Promaxx 200cc heads I just purchased from Jegs. Ordered them at 5:00pm on Friday and received them at 11:00am Saturday morning. Damn g...

PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads. 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-smooth 356-T6 casting, precision machining, and an array of assembled …I have the ProMaxx 190cc, 64cc combustion chamber heads on my 350. On Jegs they were only $773 for the assembled pair, when on Summitracing they were $900 something. They're working good for me, but you want bigger runners. Definitely compare the 2 websites for best price. blp226.ProMaxx Performance Products, LLC, Rainbow City, Alabama. 5,967 likes · 6 talking about this · 9 were here. Performance Cylinder Heads Locally Owned and Operated.....Jason Collins Call us at... ProMaxx Performance Products, LLCDec 20, 2020 · Have a few weeks until next test and tune so. Decided to swap out the Trickflow heads to ProMaxx because the Tricflows clear the 86 flat top pistons and the ... Blueprint Engines SBF heads. These 190cc heads are on Summit for $1010 for a pair. Normally I would have classed them with the ProMaxx, E-Street and Flotek heads, which all have their issues, but the reviews on them are surprisingly positive. These heads are also used on the BluePrint 306 & 347s that seem to make good HP reliably.PROMAXX Performance Project X Small Block Ford Cylinder Heads. 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.Large Spring pockets. 215cc intake runner. Diamond honed guides. Chamber unshrouded. Machined and Assembled in the USA. Assemblies feature 21-4N Stainless 1 pc Swirl polished back cut valves, studs and guide plat. Flow Data @ 28″ water.Series. The Shocker CNC Series is our top of the line performance cylinder head. It features professionally designed runners and chambers meticulously CNC ported in the U.S.A. Unlike most of our competitors, we don’t offer different quality CNC designs. At PROMAXX, we provide our elite series at prices that make our competition cringe. Checking out a pair of Promaxx 200cc heads I just purchased from Jegs. Ordered them at 5:00pm on Friday and received them at 11:00am Saturday morning. Damn g...

May 3, 2023 · Build Sheet: Cylinder Head Spec Sheet ProMaxx Project X SB Ford casting with custom cnc porting, hand finished. Intended use: turbo, hyd roller, drag/street Intake port volume: 211cc Intake port MCSA: 2.45 @ pushrod Chamber volume: 63cc Intake valve: REV CL1644 Severe Duty 2.10” x 5.01” x 11/32”, 45* w/30* back cut.

ProMAXX Performance has designed a complete new line of performance heads that meet or exceed the big names in the industry. International Shipping Options Call 1.800.235.4323 Home ProMaxx Performance Products, LLC, Rainbow City, Alabama. 5,967 likes · 6 talking about this · 9 were here. Performance Cylinder Heads Locally Owned and Operated.....Jason Collins Call us at... ProMaxx Performance Products, LLCPROMAXX Performance Project X Small Block Ford Cylinder Heads. 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 …Our products are not manufactured, endorsed or sponsored by Ford, GM, Cummins, Chrysler, Jeep, Mazda, Toyota, Isuzu or Volkswagen. Our use of the terms “Ford” “GM” "Cummins" “Chrysler” "Jeep" “Mazda” “Toyota” “Isuzu” and “Volkswagen,” and associated logos, are for descriptive purposes only.Dec 3, 2020 · 75 posts · Joined 2021. #4 · Jan 21, 2021. kjb302ho said: thats a big negative. promaxx are great heads for the money, they come with a good valve train and pac springs. I bought my second pair over black friday. Good to know. I just bought a set of Promaxx 180 cc heads with the springs that say good up to .600 lift. pacman350 Discussion starter · #9 · Oct 15, 2013. I already had vortec but the driver side head was screwed up plus I already had the intake. I like these because they come 2.02/1.60 valve screw in studs guide plate 64cc cbc and 185cc runners. And to get all of that out of a stock set of vortecs I would have paid more.Brazier Race & Machine is now working with ProMaxx Cylinder Heads. Promaxx is an alternative choice for a moderately priced cylinder head with some outstanding features and options available in various versions. All versions are available bare, or with your choice of valve springs for flat tappet, hydraulic and mechanical roller camshafts.ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Ford (210cc) ProMaxx Performance 9207 Part Number: 723-9207. ... ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc) $1,429.00 Ships Monday FREE ShippingHead and face reconstruction is surgery to repair or reshape deformities of the head and face (craniofacial). Head and face reconstruction is surgery to repair or reshape deformities of the head and face (craniofacial). How surgery for head...

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Jan 25, 2020 · 7,072. Location. Pauline, SC. Jan 25, 2020. #1. I have been working on a set of "ProMax" cylinder heads for the past number of weeks. 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. I don't know where these are really produced and I'm not going to guess. ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (200cc) Part Number: 723-9196A Product Q&A View Now Click image to zoom $1,296.00 Lowest Price Guarantee Project X Aluminum Cylinder Heads Small Block Chevy Intake Runner: 200cc Spark Plug: Angled Valves: 2.08 in. Int./1.60 in. Exh. w/8mm Stems Valve Angle: 23°ABOUTProMaxxPerformance. We are a family owned business that began in 2012 by purchasing the remnants of Patriot Performance and Alabama Cylinder Head Exchange. We specialize in all types of cylinder heads, from diesel to performance. Our performance line has become a passion. Our mission is to provide the best performing cylinder heads …ProMaxx 9217S Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates Valve springs for use with a hydraulic roller camshaft with a maximum valve lift of .600 in. 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. Uses a 14mm .750 in. reach spark plug such as NGK R5671A-7 (sold separately) or equivalent.Something new sprouted this year at Today's Homeowner – an office vegetable garden! This team project, headed by Danny's wife, Sharon, brought the Mobile staff together for some old-fashioned collaboration with the promise of delicious food...Jul 17, 2023 · I give the dyno results of testing many different manifolds with the Promaxx Project X 215cc heads.Contact information: [email protected] wengine... Both Flotek and Promaxx can make big power as well. From Chads site. 505 BBC. 315cc FloTec heads. Throats sized and SSR polished, 2.300/1.880 valves, 13.7-1, Ported Sniper JR, 268 cam, under .700 lift, 1050 QF carb 743@5300 and [email protected] XXTREMESeriesThe XXTREME Series is our newest line performance cylinder head. It features professionally designed runners and chambers meticulously designed in the U.S.A. At PROMAXX, we provide our XXTREME series at prices that make our competition cringe. Going fast doesn’t have to break the bank, so get a pair of XXTREME Series Heads today.cstraub. 4434 posts · Joined 2009. #6 · Mar 18, 2015. 1988montecarloss said: 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. ….

The final touch was an MSD distributor and ignition amplifier. Run with the ProMaxx heads, the 393 stroker produced 558 hp at 6,400 rpm and 512 lb-ft at 5,000 rpm. Peak power was raised by 171 hp and occurred 1,400 rpm higher, while peak torque jumped by 51 hp and occurred 1,500 rpm higher. Equipped with Hooker headers, the 393 stroker was run ...Nov 22, 2022 · I ported the SBC Promaxx Project X 215cc head. This is the results and some insights. PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads 9217S. Cylinder Heads, Project X, Aluminum, Assembled, 64cc Chamber, 215cc Intake Runner, Chevrolet, …Small Block Chevy ideling at 1400rpm.. 12-1 compression, .672 lift cam, forged 4340 crank, forged h-beam rods, wiseco pistons, Promaxx 225cc cnc ported heads...Project X SBF 185. (SOLD IN PAIRS) $ 1,229.00 – $ 2,085.00. The Project X 185 Ford is in one word “AWESOME” over 319 cfm in an as cast head is unbelivable. This head will make BIG power in your SBF application. Our new swirl designed chamber is the difference. Couple that with a state of the art NEW casting and you have a home run.ProMaxx Performance Products, LLC, Rainbow City, Alabama. 5,967 likes · 6 talking about this · 9 were here. Performance Cylinder Heads Locally Owned and Operated.....Jason Collins Call us at... ProMaxx Performance Products, LLCStarted with the "210" ProMaxx Project X casting. (Not 210cc) 211cc re-shaped intake port 2.45 mcsa @ pushrod pinch 2.10 x 5.01/1.60 x 5.03 REV valves 63cc re-shaped chamber Re-shaped ex ports I have a cnc program for these now which I ran in these heads but because of core shift, I finished the intakes and chambers by hand. Exports came out OK ...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-smooth 356-T6 casting, precision machining, and an array of assembled options, as well as being available bare.PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads. 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-smooth 356-T6 casting, precision machining, and an array of assembled …Shocker 225 SBC CNC(Sold in Pairs) Shocker 225 SBC CNC. (Sold in Pairs) $ 1,609.00 – $ 2,237.00. The Shocker 225 CNC is the ultimate 23 degree small block Chevy head. It requires no special components. Fully CNC’d runners and chambers designed and ported in the USA. Porting is equivalent to other companies more expensive port work. Promaxx project x heads, ProMaxx Performance Project X Bare Aluminum Cylinder Heads for Small Block Ford (210cc) Project X Bare Aluminum Cylinder Heads. Small Block Ford. Intake Runner: 210cc. Spark Plug: 14mm .750 Reach. Seats Installed for: 2.08 in. Int./1.60 in. Exh. Valves w/8mm Stems. Valve Angle: 20°., Find PROMAXX Performance Maxx Series Small Block Ford Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Maximum quality, maximum performance, and minimum pricing—PROMAXX Maxx Series SBF cylinder heads take affordable power to the next level. With ultra-smooth Grade A 356-T6 aluminum castings …, 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. Uses a 14mm .750 in. reach spark plug such as NGK R5671A-7 (sold separately) or equivalent., aaks38 Discussion starter · Mar 5, 2019. I was planning to reuse my Gt40x heads but have enough funds for a head change. I was planning to install the promaxx 9175 180cc heads on a DSS 331 and its just a street car, so am wondering if these heads would fit the bill. Im noticing these have better flow numbers than the Tw170 but not sure …, Find PROMAXX Performance Cylinder Heads 210cc Intake Runner Volume (cc) and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase ... Cylinder Heads, Project X, Aluminum, Assembled, 56cc Chamber, 210cc Intake Runner, Ford, Small Block, Pair. Part Number: PMX-9207., cstraub. 4434 posts · Joined 2009. #6 · Mar 18, 2015. 1988montecarloss said: 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., Our products are not manufactured, endorsed or sponsored by Ford, GM, Cummins, Chrysler, Jeep, Mazda, Toyota, Isuzu or Volkswagen. Our use of the terms “Ford” “GM” "Cummins" “Chrysler” "Jeep" “Mazda” “Toyota” “Isuzu” and “Volkswagen,” and associated logos, are for descriptive purposes only., ProMaxx Performance Products, LLC, Rainbow City, Alabama. 5,967 likes · 6 talking about this · 9 were here. Performance Cylinder Heads Locally Owned and Operated.....Jason Collins Call us at... ProMaxx Performance Products, LLC, ProMaxx Project X 9196A 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 use a 14mm .750 in. reach spark plug such as Autolite AR3934 (sold separately) or equivalent, 185cc Aluminum Small Block Chevy Cylinder Heads. Technical Specifications and Recommended Components: Combustion Chamber - 72cc. Weight - 55.00 lbs. Intake Runner - 185cc. Exhaust Runner - 62cc. Intake Valve Size - 2.02". Exhaust Valve Size - …, I ported the SBC Promaxx Project X 215cc head. This is the results and some insights., Project X SBF 185. (SOLD IN PAIRS) $ 1,229.00 – $ 2,085.00. The Project X 185 Ford is in one word “AWESOME” over 319 cfm in an as cast head is unbelivable. This head will make BIG power in your SBF application. Our new swirl designed chamber is the difference. Couple that with a state of the art NEW casting and you have a home run., ProMaxx Project X 92198S 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 .750 in. reach spark plug such as Autolite AR3934 (sold separately) or equivalent., 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. ProMAXX Performance has designed a complete new line of performance heads that meet or exceed the big names in the industry., 0:00 / 18:05 Promaxx Project X 200cc Head Review With Real Flow Numbers Eric Weingartner 27.3K subscribers Subscribe 984 Share 8.7K views 10 months ago I review and flow a Promaxx..., My second stroker motor conclusion is that for the same cost you could build a 396 ci using the common 3.875 stroker crank. I quit building 383's many ago because it's kinda dumb. 396 - 355 = 41 41 X 1.2 =49.2. I was also …, MAXX 317 BBC(Sold in Pairs) MAXX 317 BBC. (Sold in Pairs) $ 1,564.00 – $ 2,879.00. The Maxx 317 is truly a rare breed in today’s market. An As Cast head that is just as efficient as competition’s CNC ported pieces. Independent flow …, ProMaxx 9186S Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates Valve springs for use with a hydraulic flat-tappet camshaft with a maximum valve lift of .575 in. , 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 …, Promax Products side effects. Side Effects of Promax are Dryness in mouth, Blurred vision, Dizziness, Drowsiness, Nausea, Sedation, Tremors, Seizure, High blood pressure, …, Build Sheet: Cylinder Head Spec Sheet ProMaxx Project X SB Ford casting with custom cnc porting, hand finished. Intended use: turbo, hyd roller, drag/street Intake port volume: 211cc Intake port MCSA: 2.45 @ pushrod Chamber volume: 63cc Intake valve: REV CL1644 Severe Duty 2.10” x 5.01” x 11/32”, 45* w/30* back cut., ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Ford (210cc) ProMaxx Performance 9207 Part Number: 723-9207. ... ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc) $1,429.00 Ships Monday FREE Shipping, PROMAXX Performance Cylinder Heads - 200cc Intake Runner Volume (cc) - Free Shipping on Orders Over $109 at Summit Racing Filter Results by Vehicle Search New Vehicle Sort Sort By Default Sort Product Line (a-z) Product Line (z-a) Part Number (a-z) Part Number (z-a) Price (low-high) Price (high-low) New Arrivals Records Per Page, Promaxx Project X 185cc Head Review With Real Flow Numbers. Eric Weingartner. 27.6K subscribers. Subscribe. 388. 13K views 1 year ago. I review promaxx …, ProMaxx 9206 Project X Aluminum Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates Valve springs for use with a hydraulic flat-tappet camshaft with a maximum valve lift of .575 in. , Maxx 200 SBC. (Sold in Pairs) The Maxx 200 is the ultimate “as cast” head available that produces CNC type flow number, flowing over 280cfm. This head has produced over 550 hp on pump gas and mild cam .383. Available with multiple spring options; Hyd Flat tap, Hyd Roller, Solid and Solid Roller. The Maxx 200 is the ultimate “as cast ..., When you’re starting your career in any field, you probably have high hopes but don’t really know what to expect. Should you keep your head down and do what you’re told or should you aim only for ambitious projects? Here’s what I’ve learned..., Find 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. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting ... , ProMaxx 9196A Project X Cylinder Head Features: Fully assembled with valve springs, steel valve spring retainers, Viton valve seals, 3/8 in. rocker arm studs, and guide plates; Valve springs for use with a hydraulic flat-tappet camshaft with a maximum valve lift of .575 in., Bogie Reply Save AutoGear · #4 · Feb 23, 2022 sounds like a ringer head. "hand blended" on manufacturer advertising might be treated pretty loosely. Reply Save BogiesAnnex1 · #5 · Feb 23, 2022 If you want big flow numbers the approach that Tony Sizemore takes at Headbytes is one way to go., Our research indicates the 1973 340 engines used a large, 73cc chamber to reduce the compression ratio to 8.5:1. While this reduced NOx output for emissions, this loss of compression really hurts power. The rule of thumb with compression is that, in the range between 8.0:1 and 12.0:1 compression, one full ratio is worth approximately 3 to 4 ..., I ported the SBC Promaxx Project X 215cc head. This is the results and some insights., PROMAXX Performance Project X Small Block Chevrolet Cylinder Heads. 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-smooth 356-T6 casting, precision machining, and an array of assembled …