Promaxx 317 bbc heads. how to make bbc power.

Promaxx 317 bbc heads chinese VALVES are not to be trusted. Does anyone have any first hand experience with these heads? They are 869 bucks plus the shipping. Compare to any brand, this head makes power! Mar 4, 2016 · The only thing I will add is make sure you budget for the Promaxx heads to be gone through by your machine shop. Now go out and shock the competition. 94@122 1/4 Finally caught that 10. 625-inch). May 6, 2024 · 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. 00) Project X SBC 215 (Sold in Pairs) quantity. They also include a completed 5-angle valve job from ProMaxx. The 337 and 367 will be available late next spring. a few hundred dollars isn't going to kill me. Mar 8, 2016 · I agree with you Adger, I too think to go conservative and not go too big. was alot of fun in my chevelle street car. Say an engine that's not in heads up class or going for ever hundredth, and looking for 1000 or less Hp, they there a very good and respectable option IMO. 88 valves, 238@. looking to put it in a 67 camaro and go racing this year. S. 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. 25 valve on a 489/496 build with a solid roller and a 7500 shift point. Detailed Description: ProMaxx Performance Maxx 317 Chev BB Aluminum Heads Made right here in the USA. These affordable heads are available in both as-cast and CNC-ported versions and multiple configurations. Shop Now at the Guaranteed Lowest Price! $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: LASTCHANCE This option is NOT available w/ bare heads. We'll be pushing them to 400 here in the coming weeks. If you can't afford to build a BBC unless the heads are made by kids in China after school or on weekends, you probably shouldn't be building the BBC in the first place. 800. Forgot Account? BBC 317 PROMAXX heads , corrosion from salt water ( Speed Boat ) repair prepping for welding head. 235. Kudos to the folks at Edelbrock and other places who still manufacture in the States. No matter what brand of head you buy, nor where it was made/assembled, things like guide clearance, seat runout, spring suitability etc. i am interested in hearing from guys that are using these heads,information about engine build and dyno results. 10@118mph 9-30-22 505 Promaxx 317 Heads Straub Hyd. Oct 16, 2012 · ProMaxx BBC Head Review Jump to Latest VortecPro 496, 9. Nov 19, 2015 · The 317 head is available now. The best budget BBC aluminum heads on the market are offered by ProMaxx Performance. XXX time slip!! I show my ported AFR 305 BBC heads. 300 intake compared to the AFR 335 with 2. 25 valve for a 4. Aug 26, 2020 · 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 Get the Best Performance with ProMaxx Performance 317 Series Aluminum Cylinder Heads Big Block Chevy 9319 parts at JEGS. I dyno tested a set of AFR 265, Brodix RR270, and Promaxx 290 heads. PROMAXX Performance Maxx Series Big Block Chevy Cylinder Heads 9319T PMX-9319T. So in April this year I ordered from Skip White his BBC aluminum heads. Feb 18, 2014 · I did PLENTY of sourcing for best bang for the buck heads to my BBC, and ended up ordering Promaxx 317 from Jegs yesterday, before seeing this topic. They advertise them $1503,-, first they gave me price matched to Summits $1475,- (Summit has zero in stock) then Jegs offered 30,- bucks off on top of that. 87 151 1. I guess a better question is how would these heads be out-of-the box on a combo like this. You can contact me at Sep 22, 2017 · promaxx 317 heads. 31 bore. I wouldn't hesitate to use the 290 on that build. C 320cc ProMaxx heads Tame-ish Solid roller cam Twin S475 turbos Sep 29, 2015 · 320cc ProMaxx heads Tame-ish Solid roller cam Twin S475 turbos Thinking it would be a somewhat "budget" build with enough power to get a full weight car running low 8/ high 7's in the 1/4 while being plenty streetable. And, this is a rebuilt oe stock 6. The Maxx 317 is truly a rare breed in today’s market. The larger stuff ProMaxx has in development. 56 4 inch stroke short block i could put the cam and promax heads on. 4323 MAXX 317 BBC (Sold in Pairs) Performance Cylinder Heads. Diesel. Oct 2, 2008 · Jegs High Performance not only sells just about any performance part you can think of, it also sells its own performance Rat heads. Timely shipped from Promaxx. An As Cast head that is just as efficient as competition’s CNC ported pieces. More than one head porter has reported 400cfm+ from the ProMaxx 317cc runner head with nothing but a 2. Sold 3/2018 There are two videos, IIRC: one on a SBC and one on BBC Find PROMAXX Performance Cylinder Heads 317cc Intake Runner Volume (cc), Stud Rocker Arm Mounting Style (application) and get Free Shipping on Orders Over $109 at Summit Racing! Jan 30, 2020 · I think an AFR 290 on a 496 would be just fine. At PROMAXX, we provide our elite series at prices that make our competition cringe. Add To Cart. Going fast doesn’t have to break the bank, so get a pair of Shocker CNC Series Heads Feb 13, 2022 · intake is a newer team g. Its runner will feed your beast, street or strip. 84 Gearset FTI Converter Moser 12 bolt 33 Spline Axles 4. Yes (+ $ 20. Set of slightly used Promaxx 317 heads with arp 6 days ago · 317 Series Aluminum Cylinder HeadsBig Block ChevyAs-Cast317cc Intake Ports119cc Combustion Chamber2. I share the results from them. 300 or even 2. This head will change the industry. he got 500 for his 5k engine. My plan was for a 320 head and a 2. Dec 1, 2016 · With our tuning finally dialed in, the ProMaxx BBC heads demonstrated their worth on the 572 stroker by producing peak numbers of 850 hp at 6,800 rpm and 719 lb-ft of torque at 5,500 rpm. These things, as plenty of you know, are sold a lot of places and under a number of different names. I also tried different intakes to see how they compare wi Mar 21, 2016 · Re: Promaxx 317 BBC head for 496 build Post by vortecpro » Mon Mar 21, 2016 10:31 pm Bob Hollinshead wrote: Mark has alot of years sorting out what works to make big power with these oval ports-I doubt he's interested in sharing his head porting details and I don't blame him LOL. L-29 461 BBC 11. ProMaxx Performance HEAD MAXX BBC 317 ASSM. Add to cart. A. Jun 13, 2016 · Should be getting my 496 back from the shop, 13 to 14 compression, the person who is boring my block said to use a dart 345 head, with a comp cam 734 714, 278ish 286ish @50, are these heads right, or to big, 90% race, 10% street. 10@118mph 9-30-22 Yes, the heads came from Promaxx with their valve and Feb 19, 2018 · 383, 40 over, 11. Part Number: PMX-9319T Estimated Ship Date: Jan 29, 2025 Sep 7, 2023 · But if I was starting with this again and needing heads, I would definitely run either the Flotek 315 or the Promaxx 317's. chinese castings used to be junk. 25'' Intake / 1. 600 lift with a 317cc port! 2. 73 gear Dec 22, 2005 · ProMaxx BBC Head Review Jump to Latest 21 - 40 of 111 Posts. 600"), Pair In Stock 317 Pro maxx BBC heads - $1,400. 350" valves and tweak them a bit ProMAXX Performance has designed a complete new line of performance heads that meet or exceed the big names in the industry. Independent flow bench testing shows over 400 cfm with 2. Part 1 Feb 18, 2022 · 505 Promaxx 317 Heads Straub Hyd. Compare to any brand, this head makes power! Get the Best Performance with ProMaxx Performance 317 Series Aluminum Cylinder Heads Big Block Chevy 9317 parts at JEGS. 70 Chevelle 565 t-400 8. The Maxx 317 is truly a rare breed in today’s market. Mar 21, 2016 · Re: Promaxx 317 BBC head for 496 build Post by vortecpro » Mon Mar 21, 2016 10:31 pm Bob Hollinshead wrote: Mark has alot of years sorting out what works to make big power with these oval ports-I doubt he's interested in sharing his head porting details and I don't blame him LOL. A produces out of box performance that out performs the top brands in the industry. 600'' Max LiftSteel RetainersAssembled, 2/pkg PROMAXX Performance Maxx Series big block Chevy cylinder heads are custom designed to satisfy demands of the big block Chevy world, while retaining high-quality craftsmanship and reasonable I give real dyno numbers comparing Promaxx 317cc BBC heads to AFR Enforcer BBC heads. PROJECT X SERIES LS XXTREME SERIES SHOCKER SERIES MAXX SERIES SERIES ONE. Part Number: N/A Category: Project X Series I show the flow difference between a ported and stock promaxx 290 head and the horsepower difference between the two heads. These are some of the nicest castings I've had the opportunity to handle. Roller Edelbrock ProFlo 4 670hp/610tq May 20, 2020 · This video reviews the Promaxx Performance Freedom Series aluminium cylinder head that you can buy from outlets such as Summit Racing. Same engine same dyno same day. These heads out flow the competition at a price that cannot be touched. ProMaxx, Maxx 290 Oval Port, Chevrolet Big Block Aluminum Heads: 290cc/110cc, Assembled, Mechanical Roller (up to . 4000 sthal, 3. 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 shoot for maybe 500 crank hp, rev to 6800-7000, single plane intake, 4150 holley 750DP Dec 22, 2005 · For most of us, the money that we spend on this hobby is discretionary spending. These square port aluminum heads feature 310cc intake runners, as-cast 119cc combustion chambers and raised exhaust ports (. Roller Edelbrock ProFlo 4 670hp/610tq 700R4 2. Reply 09-28-2017, 04:07 PM Oct 1, 2019 · Take thatbfor what it's worth. Use carefully planned pistons on your build. I have a set of castings in stock I could build Jan 25, 2020 · Banghart Diesel & Performance put down 355hp/659tq through a set of ProMaxx heads recently and a bunch of other parts from us. 87 at 150. Jun 11, 2023 · I give dyno comparisons between a set of Promaxx 290 oval (roval port) heads vs Promaxx 317 heads. May 26, 2019 · Hell Abbott he said the RHS are some of the best 24 deg heads: "The RHS 320 heads are still some of the best 24 degree heads out there. Though ProMaxx offered both smaller, as-cast and larger CNC-ported heads featuring 370cc intake runners, we opted for the middle of the three available The Maxx 290 is truly a rare breed in today’s market. They are Procomp heads. These heads outflow the competition at a price that cannot be touched. XXX time slip!! MAXX 290 BBC CYLINDER HEAD PR. Make sure your valve to piston clearance is a non issue. 1 flat tops, trying to ballpark 500-550 crank hp. Ive never seen aluminum bbc and sbc side by side before, so i thought id put it out there for everyone! Jun 1, 2017 · I have been looking on Skip Whites web site and am considering a set of promaxx 185 64cc aluminum cyl heads for a hyd roller 383. Gets a valve job and full port job . 0l lq4 / lq9 cylinder head assembly. 00. Nov 13, 2022 · I give a review of the Promaxx CNC ported bbc 325cc head with flow numbers. Jegs "J" series of BBC heads are cast aluminum and CNC-machined for a precise fit. Go. 300 valve upgrade that we do here, unported will support over 800HP if wanted. Taking the affordable performance cylinder head to the next level. Hobbies › Car Engines & Parts Save. Aug 23, 2020 · I’ve looked at promaxx 317 rect port heads as well. 250 intake. Not Yet Reviewed. 300 valves. I think the Brodix RR BB-3 XTRA O's are a bit out of my planned budget. Your 496 would exceed your goals with a set of the RHS heads with a little work. 8:1 comp. rocker studs, guide plates, and seals. If I was a 540 or 572, then rec. Just make sure the entire combination compliments itself. Part Number: N/A Category: Project X Series It features professionally designed runners and chambers meticulously CNC ported in the U. Mar 27, 2017 · The heads I am looking at are the Promaxx 317 for a solid roller with the 2. Sold · Pro maxx 317 bbc heads. On paper, the specs on the BBC heads supplied for the test certainly looked impressive. Jun 10, 2023 · I will also give you guys an "end users" point of view of the ProMaxx 317 vs AFR 315 since that is what the 317's are based off. what should I keep in mind when asembling the heads?which valve brands should I use? thanks Jun 15, 2020 · I just wanted to share my experiences with these heads so others can evaluate what I dealt with and decide if they are worth their investment. Casting quality, machine work very good. Price was $1445,- a pair with HR springs. Shop Now at the Guaranteed Lowest Price! $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: NEWYEAR Dec 19, 2008 · I would agree that a 317 would work on a budget 496, but I would use a 2. Feb 27, 2019 · If the opportunity presents itself and they fit your build, I'd take a good long look at ProMaxx 317 heads. 25/1. Some comparable heads are double the cost of one Shocker 325 CNC. Ray Best pass 8. think it would make more power or r Cylinder Heads; ProMaxx Performance Big Block Chevy Aluminum Cylinder Heads; 317 Series Aluminum Cylinder Heads Big Block Chevy $2,375. 56 1/8 10. Showing what I’m doing now on the promaxx 317Contact info:Weingartnerracing@gmail. I've been planning to get the profiler 210 cc but the promaxx popped up and looked very decent for the price. buy bare castings and put manley or ferrea valves in with compcams or better springs, locks, etc. Save. Flowing over 415 cfm, this head is on top of the heap. Available assembled or bare, these heads feature ultra-smooth 356 T-6 aluminum castings with hand-blended valve bowls, efficient chamber designs, 5 Mar 12, 2016 · Re: Promaxx 317 BBC head for 496 build Post by Bob Hollinshead » Mon Mar 21, 2016 5:21 pm Mark has alot of years sorting out what works to make big power with these oval ports-I doubt he's interested in sharing his head porting details and I don't blame him LOL. Find PROMAXX Performance Cylinder Heads bbc heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Dec 30, 2021 · hi guys I have come to a crossroads where I would either cost on my 781 or a hefty porting or buy new heads. i would like to make around 800 hp but still be pump gas. 10 Gears Truetrac 1. Now 13% duties is $4,373 plus $250 shipping. He made around 630 horsepower with a flat tappet and port stock oval port heads. guy paid 5k for complete engine. Listing Number: a set of lightly used Promaxx 317 heads, complete with ARP head bolts. ProMaxx Performance Maxx 317 Chev BB Aluminum Heads Made right here in the USA. Flow numbers as specified. I have a set of ProMaxx 317's that I regret having purchased. having them in the states and accountable to their customers is a big plus over the chinese ebay This option is NOT available w/ bare heads. Share. The AFR265 and 305 are AFR's best bang for the buck. They go real good with a little work and can make big power with lots of work. 512 60ft. In fact most of the bottom end is going to be the crank, rods and camshaft from my 540. they have gotten better. I think they’re a nice affordable head. i have a 4. 050 Isky Hyd Roller, Eddy Air Gap, Holley HP1000, The Shocker 370cc full CNC ported is the Big Dog in our BBC line. ProMaxx 317cc ported Feb 7, 2023 · The Jj Original Equipment Promaxx 317 Bbc Head has good features for the price point. No major work was done to these other than a basic gasket match job. 98 1. 25 to 1 The Maxx 317 is truly a rare breed in today’s market. 10. 25 to 1 static c/r ProMaxx BBC 317 cast as port heads. ProMaxx Performance 9318 - 9318 317 Series Aluminum Cylinder Heads for Big Block Chevy (0) The Shocker CNC 325cc BBC is a professional designed cylinder head using the latest CNC porting tools. Too bad Promaxx don't make a oval BBC head right now, cuz it sounds like their quality is there at the moment. 300 valve and better valve job - I'd buy them bare and have somebody that knows what they're doing install 2. He said Chad really likes the heads and thinks there really nice for the smaller motors. com Nov 21, 2019 · 68 Chevelle Hardtop-11. peanut port vs aluminum heads. Rated 5 out of 5 by 68 Camaro Fast 16 from Promaxx delivers a top quality product ! Purchased set of 2210 BBC heads to inspect and I'm pleased to say they are everything advertised. And for us guys NORTH or the boarder, those AFR 315 usually land in the $7,000 just for a assembled head. These heads will support over 700HP out of the box. Promaxx Performance continues to evolve with the Project X lineup and has raised the bar on the competition. Part Number: PMX-9317 Estimated Ship Date: Feb 3, 2025 Mar 8, 2016 · I agree with you Adger, I too think to go conservative and not go too big. Details. I hadn't considered them previously, because I was originally researching heads for my 502 and was looking for smaller chamber cc's to match the 502 pistons. The out of the box 325's, then had them cleaned up, then the CNC 355 heads. Find many great new & used options and get the best deals for PROMAXX Performance 9318 317 Series Aluminum Cylinder Heads Big Block Chevy at the best online prices at eBay! Free shipping for many products! Feb 26, 2019 · Either the AFR305 or the ProMaxx 317's will reach your goal. 800" lift cam, the old patriot website used to have flow data on the page but promaxx apparently doesnt offer that yet on their website. the engine was something i put together with parts from other projects. ports heads for sure, but I just feel the ovals are more suited for my street application at this point. The ProMaxx head with a 2. For a hydraulic roller engine of 450-600HP in an aluminum head is the ProMaxx 317 BBC head with Inconel exhaust valves for about $1700 per pair assembled. Shop the Best available ProMaxx Project X Series Small Block Chevy Aluminum Cylinder Heads parts at the Guaranteed Lowest Prices! High Performance Parts Delivered Fast. RPM airgap intake MSD distributor curved by Billy G's personal 496 build for his 1969 Camaro. 21 60' and 3200lbs Sold 3/18 Ray. Oct 8, 2024 · Find PROMAXX Performance Maxx Series Big Block Chevy Cylinder Heads 317cc Intake Runner Volume (cc), Dual Number of Springs Per Valve, Retainers Included and get Free Shipping on Orders Over $109 at Summit Racing! PROMAXX Performance Maxx Series big block Chevy cylinder heads are custom designed to satisfy demands of the big block Chevy world, while retaining high-quality craftsmanship and Sep 21, 2022 · These things are beautiful!!! Heads ; About; Contact; BBC - Promaxx - 317cc Ported. 68 Chevelle Convertible-454, 12" manual disc brake conversion, B-Body Knuckles, rotors modified to hubs for the Vette rotors, HD Suburban 3-5/32" piston calipers, 75 vette master, DOT5, (stops like my 9C1 4-wheel disc Caprice) Feb 13, 2024 · Eric Weingartner wasn't all that impressed with ProMaxx's CNC ported heads, they just don't flow the air that they should for the size. 317cc intake runners great for street, street/strip, power tour, or smaller cubic inch competition (427-525ci). ProMaxx Performance Maxx 317 Chev BB Aluminum Heads, 317cc/119cc, Assembled, Hydraulic Roller (up to . aluminum should use closed cooling but if a lot of freshwater use or good flushing after use aluminum will be fine. pro comp heads, an intake valve head popped off in his driveway at idle. 89@102mph 1/8 mile 6-24 L-29 461 BBC 11. Blue66's car proves this with his pump gas 496 that runs 9. 049 heads 2. PROMAXX Performance Maxx Series big block Chevy cylinder heads are custom designed to satisfy demands of the big block Chevy world, while retaining high-quality craftsmanship and reasonable prices. Feb 14, 2019 · I made a post about his motor in my L88 shortblock thread. That went out the window going to a 540. BLACK FRIDAY SALE: 15% OFF SITEWIDE - LIMITED TIME ONLY International Shipping Options Call 1. 80s. Into CND $$$ now is $3,870. 212 60'. Level up your ride with a pair of PROMAXX Performance Maxx Series big block Chevy cylinder heads. Part Number: 723-9319T. 1 2 of 6 Go to page. do cheap aluminum bbc heads work? how much power do speedmaster bbc heads make? can the afr 265 heads m Get the Best Performance with ProMaxx Performance Project X Assembled Aluminum Cylinder Heads for Small Block Chevy (215cc) 9217A parts at JEGS. 350 valve, this head will support big cubic inches and Big power that will not break the bank and will shock your competition and ours. 6. 00) Project X SBC 200 (SOLD IN PAIRS) quantity. Website: www. Both Flotek and Promaxx can make big power as well. 1L engine. comEmail: w Sep 26, 2017 · An out of the box as cast AFR 305 head would be fine if cost is an issue. com ProMaxx Maxx 317 Chev BB Aluminum Heads Made right here in the USA. 944@98. The ProMaxx 723-2211 cylinder head does not fit an 8. They as good or better then the AFR's, yet about 1/2 the cost of AFR. 85@115 on Dunlop GT Qualifiers, through mufflers. 88'' Exhaust Valves7/16'' Rocker Arm Studs. i almost bought a blown 496. I show flow numbers and dyno numbers. Kit Includes: ProMaxx SBC 225cc Aluminum Cylinder Heads - 723-9225 how to make bbc power. My last 4 engines have all had Dart heads on them. The Shocker CNC 340cc BBC is a professional designed cylinder head using the latest CNC porting tools. $1,200 $1,400. Find PROMAXX Performance Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! May 20, 2020 · This video reviews the Promaxx Performance Freedom Series aluminium cylinder head that you can buy from outlets such as Summit Racing. 600"), Pair 317cc/119cc, Assembled - Hydraulic Roller (up to . Flowing over 450 cfm with a 2. DIESEL. 315cc FloTec heads. Jun 4, 2023 · I have been saying for years that BOTH Flotek and Promaxx are a good quality heads that make good power. The ProMaxx look very interesting. I ordered a pair thru Jegs and thanks to their current promotion of $100 off orders of $1000 or more, my cost was about $1150 to my door for a pair of bare heads. This is an all ProMaxx head. 97 at 209 this weekend past with the PW BbC heads on his twin turbo deal. Nov 5th 2024 644 0 $1,400. XXX time slip!! Jan 5, 2025 · I bought the 317 heads. He has the flow numbers posted on his website. 700"), Pair : Check for Availability: Will be shipped via: ITEM SHIPS DIRECT FROM MANUFACTURER MAXX 290 BBC CYLINDER HEAD PR. I have used the Promaxx 317 head on a 496 and it looked like a really nice piece for the money. The economical "As-Cast" aluminum versions feature ultra-smooth 356-T6 casting Oct 22, 2019 · 520 BBC 6. Well here is Eric's video comparison between BBc ProMaxx 317 with 2. Unlike most of our competitors, we don’t offer different quality CNC designs. I show measurements and flow data for the promaxx 370cc Cnc ported bbc heads. That’s what we call getting Maxxed Out! Assembled heads include 21-4N swirl-polished valves, springs, retainers, 7/16 in. Part Number: PMX-9290. Set of slightly used Promaxx 317 heads with arp head bolts set up for hydraulic roller camshaft. Most importantly, the jj original equipment promaxx 317 bbc head has exhaust port volume and it has rocker arms. And I like the Dart heads. Website: wengines. Jan 14, 2018 · 1. I got a good price on a pair of empty flotek 290 ovalport heads, which I intended to drive with a solid roller and a weiand tunnelram intake and fitech injection. So total in 317's is $4,623. $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: 2025 Jul 22, 2014 · big blocks benefit the most, i think, because you simply cant get a cheaper set of aluminum heads from an american company pro filer is nice if you have a . , needs to be checked. A friend did go 6. Cummins GM ProMaxx Performance 9317 - 317 Series Aluminum Cylinder Heads Big Block Chevy (0) $1,564. MAXX quality & MAXX performance at minimum pricing – Promaxx Performance. Some comparable heads are double the cost of one Shocker 340 CNC. Product Q&A Kit Includes:Pro Maxx 180 Series Small Block Ford Aluminum Cylinder Heads (2)-723 Dec 1, 2016 · After looking at the results of this test, the gang at ProMaxx might just have pulled off the hat trick. Jul 7, 2024 · Now the Promaxx 317 does call-out the same Pw ARP stud number of 235-4713. Buy once, be happy. These heads are Jan 2, 2019 · Thanks Scott, I appreciate the input. Apr 23, 2021 · speedmaster is a chinese head. . From Chads site 505 BBC. PROMAXX Performance Maxx Series Big Block Chevy Cylinder Heads 9317 PMX-9317. 25 intake valve. comEmail: weingartnerracing@gmail. Shop Now at the Guaranteed Lowest Price! $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: 2025 This combined with our 5 angle competition valve job, diamond honed bronze guides, hand bowl blending and assembly by our professional builders right here in the U. The pair of heads we have here are production heads as they are received from the foundry. These heads are very ch Jan 5, 2024 · 505 Promaxx 317 Heads Straub Hyd. I know these arent AFR heads but they dont cost as much either. John thinks his 427 will be real close to 700 with the 290 Flotec heads and roller cam. These heads came from someone who had them on a new build and were only used during break in period. Make sure this fits by entering your model number. Find PROMAXX Performance Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! Log In. This head flows 385cfm @. wengines. Scott has flowed the head AS IS with simple 3 angle cut supplied by foundry. 317 list for $1,564 - $2,879, so let say $2,900. tzevk cpjzg asjasv jsg njqdhc gjgcwok zpmslaa fckjw vaco chyd