Afr 300 bbc heads review 300" intake valves. 625 spring upgrade and Tulip exhaust valves along with titanium reatiners. Really don't think I need that level head either. 385cc BBC . Just to put it into perspective its 2700. com Oct 2, 2008 · Magnum 325cc BBC Cylinder Head AFR's Magnum heads are available with a variety of upgrades, ranging from intake port sizes starting at 305 cc all the way to 357 cc. 0016") for most applications. intake and 1. Dec 2, 2012 · Congratulations. AFR offers their own gasket (PN 6893) as the correct choice. This is what I am planning. 10. Find AFR 300cc Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 300cc Magnum BBC cylinder heads are suggested for aggressive builds. The standard combustion chamber volume for the fully CNC-ported 335cc is 121cc. Boosted Write the First Review. 880 Exhaust Valves, CNC Ported, 1. It's a 14 to 1 heavy car footbraker. The AFR 357cc heads come standard with AFR's trademark 3/4 in. CNC-Machined Combustion Chamber: AFR 377cc Magnum BBC Competition Racing Heads with qualifying orders Free Shipping - AFR 265cc Oval Port Magnum BBC Cylinder Heads with qualifying orders of $109. 68 Camaro~406ci Jul 28, 2009 · AFR BBC Oval Port Heads. 0012"-. 1. id like to see 900hp+ doable? lets hear some ideas Jan 3, 2020 · I have a set of 300's on a 14 to 1 565 which have been worked a little bit. Boosted/Nitrous or AFR recommends the use of . 7 ratio rockers for 0. Oct 1, 2019 · 505 BBC. General Recommendations for AFR Cylinder Heads: Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR. looking into a 540 or 565 type deal. 300-. AFR Big Block Chevy With some domed aftermarket pistons, it may 423-391-7774; 198B Industrial Park Road, Suite B, Piney Flats, TN 37686 Jun 25, 2008 · C3 Tech/Performance - BBC Heads AFR vs Edelbrock - I'm considering various cylinder heads for a 496 BBC I'm building. 055 / 1. Combustion Chamber Size-109cc AFR’s new 457cc 18° Big Block Chevy cylinder heads are our best performing highest-flowing heads in our BB Chevy lineup. For the record here are some of the measurements compared to an Edelbrock RPM Air gap 7516: AFR 4910 Intake, port height --- 1. He said Chad really likes the heads and thinks there really nice for the smaller motors. CNC-Machined Combustion Chamber: Write a Review View All Reviews. A small well shaped port is better than a huge port that does not have a good shape. 2. 500. AFR recommends the use of . CNC-Machined Combustion Chamber: AFR 377cc Magnum BBC Competition Racing Heads with qualifying AFR 3670 BBC Magnum Cylinder Head, Assembled, 2. Oct 7, 2012 · I am putting one together as we speak== AFR oval port 300 cc heads, Race tec, 20 cc dome pistons,a big Comp Cams hyd roller, and a big carburetor on an Edelbrock victor intake. High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption AFR’s tech department can assist with more information. antisipating at least 700 hp and 650 tq. thanks 2. 250 or . Combustion Chamber Size-112cc Jan 26, 2011 · I'm running a 315 head on a 540 pump gas engine as well. the Dragon Slayer is a 26 degree BB2 based head, an as cast version of the BB2 Xtra CNC head. Rockwell test Head CC Chamber CC Intake and Exhaust Runners Check Seat concentricity and valve guide clearance as shipped Flow test head out of the box with 2. 10@118mph 9-30-22 Nov 13, 2006 · AFR, makes a very nice headwhat is the combo you want to run? Depending on the power and rpm range of the motor, the Brodix Race Rite might be a better option. I've seen some awesome info on the 265cc afr heads from vortexpro. would like to hear from some of you guys on setups. Thinking about going with Dart 325 Pro 1 with 2. AFR's 357cc cylinder heads features fully CNC machined intake runners, exhaust ports and combustion chambers; capable of flowing 425 CFM at 0. last night while measuring for pushrod length i noticed that the guideplates actually contact my comp cams pushrods in the tapered portion of the pushrod(3/8" pushrod with 5/16" ends). 660 gross lift - 2" primary headers & twin 3" system RWHP – 390 11. looking to base a new build around them. As indicated by the name, the oval-port offerings from Airflow Research featured 300cc intake ports combined with 123cc Jul 18, 2012 · Equipped with the Procomp heads, the BBC stroker pumped out 690 hp and 600 lb-ft of torque. Free shipping on orders of $199. the AFR Magnum 300 heads proved to be the optimum combination by producing 729 hp and 639 lb-ft of AFR's 345cc BBC cylinder head is recommended for radical street/strip, "Pro Street," or racing applications with displacements up to 572 cubic inches, operating at or below 7000 RPM. Don't need 7 or 800 horse. ports in stock location and flow pretty decent. 050 lift and at least 10. 800 exhaust valves. Been sold under a bunch of different names, most who know about it call it the ProHeader castingbut Assault Racing, Racing Power Company(RPC), Skip White's New Kid on the Block(NKB heads), Engine Pro, are a few of the others that sell it. 500 and 4. I'm building a 496 right now and it's for a 71. 315cc FloTec heads. and for a street / strip engine around a 510 cube, they should be perfect, and engine should last The 300cc oval port cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers; our 300cc oval port flows 388 CFM at 0. Part Number: AFR-3002 Estimated Ship Date: Monday 1/13/2025 Wondering if anyone used any promaxx 317 yet. If you’ve got the displacement AFR’s head can feed it with an intake port that flirts with 440 CFM at a usable lift-point, and enough complimenting Dec 31, 2015 · Tom, just another heads-up on what you may run into (pun intended) with an off-the-shelf open chamber BBC piston dome. The heads will have larger intake valves installed and be reworked where needed. As long as the building process of the head is reliable then its a good deal. 569 237/241 at . Jump to Latest '67 Chevrolet Biscayne- SS427 L-36/TH400, '67 Hell Camino-BB 427/TH400 , '66 300 Deluxe 2 door-230/PG Feb 6, 2014 · I have quite a few customer with AFR heads on their engine. . Dec 22, 2005 · I just want a reliable head with good parts in it, that will outflow a stock head, and give the weight savings of aluminum. This budget friendly head is perfect for your 509 to 540 Cubic Inch operating below 6500 RPM. plan on shifting at around 6800 / 4. 4:1 compression – Pump Fuel Apr 1, 2016 · Conventional wisdom suggests big power requires big cylinder heads, but don’t count out a set of AFR oval port heads, especially after they have been given the once over by Merlin the (flow) magician at Mamo Motorsports. 350 or so, but so far no one is complaining about header issues. 73gears. Dec 22, 2005 · ProMaxx BBC Head Review Jump to Latest '66 300 Deluxe 2 door-230/PG I tested one of my Canfields and an AFR headthe Canfield tested at 54. They are available with an optional 114cc combustion chamber as well. Even if your comp is low, the size of the piston's dome is not important as interference is at deck height. These AFRs are based on an LS6 style chamber, but are not exactly the same. He made around 630 horsepower with a flat tappet and port stock oval port heads. Cam is on a 112lsa. 27 1. General Recommendations for AFR Cylinder Heads: Mar 5, 2013 · For our oval-port big-block build, we chose a set of AFR 300 Magnum heads. 7-1, Ported Sniper JR, 268 These 325cc heads come standard with AFR's trademark 3/4 in. 11 gear / glide / 4500 stall / 3000 lb car . $20 Off $250 / $40 Off $500 / $80 Off $1,000 - Use Promo Code: GETREADY AFR recommends the use of . Buying them with some PAC specific parts and they save $1,143. 5 out of 5 stars. If this 565 BBC is any indication, there are a great many big blocks sporting the wrong shape intake ports. 600. mild 680 lift,255/263 . Website:Www. The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend. High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption Aug 23, 2020 · ANY head I buy gets disassembled, checked for runout, etc, checked on a flow bench and I expect to do a little port matching. this is not a world beater but it tells me that with the afr much better head i think these pump gas street motors can run high nines easy and at full street weight . 800" of lift. 880 in. Lol Aug 7, 2013 · tested with 4. 27 @130. Without even putting eyes on a head, weigh it bare and compare to heads made by Brodix, Dart, Edelbrock. 4 days ago · AFR 335cc Enforcer BBC Cylinder Heads 3002 AFR-3002. If you’re staying with the 4” stroke. AFR Heads, 3670 BBC AFR 300 Magnum Heads, CNC Ported, Hydraulic Roller, 112cc AFR, Aluminum Heads, BB Chevy, Intake Runner 300cc, Combustion Chamber 112cc, 2. It's being built as a hipo street engine. Sep 18, 2018 · I can bet that the BBC heads would be just as nice. 653/0. 050) - 1. Better money spent to go aftermarket? On another forum cstraub did good review on them said they wasn't junk but not quite AFR level. 400 intake valves and 1. AFR advertises the 4910 as the ultimate out of box match for their oval heads. Part Number: AFR-2015-TI. Oct 8, 2008 · if you think the 265cc AFR BBC heads perk up an engine, you have to try the 300cc AFR versions, I've read more than a few dyno tests showing the results are very noticeably favoring the marginally larger port size especially if matched to a roller cam with at least 245 degrees of intake duration at . The aluminum head found on GM BBCs is an Edelbrock head w/a GM part #. Do I expect it to outflow a Dart or AFR that has the funding for research behind it. These oval port competition packages are available with hydraulic or solid roller AFR'S 335cc BBC Enforcer Cylinder heads feature our Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. Torque curve stayed pretty flat from 4500 to about 6600. Apr 21, 2015 · Adding AFR 265 oval port heads can add at least 80 horsepower. Recommended for street, strip, or towing . Jan 5, 2005 · 1969 Chevelle 496 BBC W/AFR 305's I'm running the same AFR heads you have, on my 489 and I ended up with a Comp custom solid roller cam, 252/262 @. AFR 300cc BBC Magnum Competition Heads . Current setup: weight: 3450 w/driver compression: 11. 7-1, Ported Sniper JR, 268 cam, under . Exhaust Port Volume-132cc. Specifications: Intake Port Volume-290cc. It’ll make gobs of torque. Thanks, Bill Jul 24, 2021 · Before you throw money at heads that are hit-and-miss quality and set-up, check out ProMaxx. 310, 4. There are a few reviews here, search and ye shall find. 280cc Street Head Flow Chart . The intake runners and exhaust ports are partially CNC machined, while the combustion chambers are offered with partial or full CNC machining with a bowl blend; this torque monster is capable of flowing 354 CFM at 0. 5-1 compression with a pancake torque curve. They also caution not to port-match your intake manifold to a Fel-Pro gasket, as it doesn’t match the heads properly. For ideal geometry and wipe pattern AFR strongly recommends AFR stud mount rockers part #6043 for applications below 7400 RPM and . operating at or below 6,200 rpm—providing tons of bottom-end torque, tremendous throttle response, and great all-around power. Dec 29, 2017 · have a set of 335cc AFR heads already from my old 468 build. Completely different qualiity than any other Chinese casting that I've had my hands on. Specifications: Intake Port Volume-457cc. AFR 305 cnc chamber or AFR 325 cnc chambers? 041 quench, 10. 94" (Identical) AFR's 345cc BBC cylinder head is recommended for radical street/strip, "Pro Street," or racing applications with displacements up to 572 cubic inches, operating at or below 7000 RPM. haven't bought these yet, or the isky lifters, short block is done though. 5 compression ratio bracket type engine. 2 @ 125mph in a 3350lb 72corvette (Traction troubles) New Combination with the AFR heads: - 439ci @ 11. Given the fact that these 300cc Roval Ports the heads have potential on an appropritely cubed BBC INT cfm Exh cfm . 700" lift and is the ultimate street/race weapon without having to step up to a rectangular port design. 650" lift. I’m on a tight budget. Made 900 horsepower from 6700 to 7100 and 760 lbft at 5500. 5:1 comp calculated *CNC chamber AFR's milled to 114cc . Feb 14, 2019 · I made a post about his motor in my L88 shortblock thread. 5 to solid roller street cam 260ish @ 050, high 600 low 700 lift. Sep 1, 2014 · 69 El Camino SS Custom ATK 496 Stroker,10. Find CHEVROLET AFR 300cc Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 300cc Magnum BBC cylinder heads are suggested for aggressive builds. That said, as suggested above, a set of 305's will serve you well but whatever head you choose will require some planning on the entire combination including some intake porting as will the heads for optimum results. Hardware used is iwth 1. So, if this is a Chinese copy of an actual GM design, it would be at least 45 years old. Cam is a roller 242/640 intake, 246/650 exh. Using Isky valvetrain and Ross pistons with Jones Racing vacuum pump. Thing made 900hp with them. exhaust valves. 00 of labor. with borlas. 200. 840 in Valves, 300 cc Intake, 112 cc Chamber, Aluminum, Pair Rating Required Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Jan 28, 2021 · 91 coupe,306,afr 165 heads,anderson ford b-3 cam,edelbrock rpm intake,30 lbs injectors,73 mm mass air,70 mm throttle body,255 fuel pump,crane Hi6,new nx 100-250 system,bottle heater,15pnd bottle upgrade,jacobs nitrous mastermind,bfg drag radials,south bars,pro 5. 9 w/121cc chamber intake: holley strip dominator -will probably change carb 4150 w/ proform 1050 hp style main body Nov 29, 2021 · In this , episode 34, DV gets to grips with the new AFR 'Enforcer' BB Chevy heads. The standard combustion chamber volume is 119cc on these AFR's 325 "as-cast" pieces. No I don't. . Jun 24, 2010 · stock jegs (canfield )310 cc heads vic jr intake and 950 hp carb 2"headers 4500 stall best pass 10. 600 Valve Guide Clearance - Your AFR Heads come with proper guide clearance (. Recommended for radical "Pro Street" or racing applications with displacements up to 605 cubic inches, operating at or below 7400 RPM. Is it as good as AFR claim? Certainly the flow as much and, at some lift p Jan 5, 2007 · i am having a couple of issues with my afr 305 heads. 00 over the AFR heads. 200 163 147. thick head deck, reinforced rocker stud bosses, and premium one-piece stainless steel 2. AFR 265cc BBC Magnum As-Cast Heads . Jun 4, 2023 · Guys, what does surprise me is that AFR selected to use a bigger, less street friendly head as there BBc China Ginny pig! A 335 sized head is a more serious engine combo that one would seem LESS inclined to sway to a cheaper off-shore casted head? I thought they might do something between the 265 and 290 as a cheaper "street" head. Exhaust Port Volume-143cc. 5:1 compression, The 345cc heads come standard with AFR's trademark . Buying the assembled 290 as they offer them saves $1,411. FINAL DAY! $20 Off $250 $40 Off $500 / $80 Off $1,000 - Use Promo Code: GETREADY Aug 29, 2006 · Which heads would you guys put on a 496, in a 3500# car. 637 Nov 18, 2024 · These 325cc heads come standard with AFR's trademark 3/4 in. 300" intake valves and 1. Instructions & Calculators AFR 300cc Magnum BBC Cylinder Heads with qualifying AFR's 300cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. 505 BBC. 520 BBC 6. Jan 3, 2009 · I have a 461 bbc and I am replacing my #188 iron GM heads with a set of AFR 315 full cnc heads and am looking for ideas to optimize my setup. 625 raised exhaust port locations. They come fully assembled with the identical components found in Sep 1, 2009 · AFR has released an all new 375 cc Magnum Series BBC head, the largest and highest flowing BBC product in its line-up with flow numbers that are closer to 18 degree Pro-stock style heads. General Recommendations for AFR Cylinder Heads: Mar 1, 2008 · Check out this 496 Chevy Big Block Engine get tested with Edelbrock Performer RPM Cylinder Heads and Dart Cylinder Heads other cylinder heads are TFS, Brodix, GM and Pushrod, Featured in Car Craft 4 days ago · The 335cc heads come standard with AFR's trademark 3/4 in. Wondering if the 290cc will be worth the money for a street car besides bragging about hp. But there Free Shipping - AFR 300cc Magnum BBC Cylinder Heads with qualifying orders of $109. AFR's 300cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. AFR and T&D don't seem to communicate on what shaft rockers to use on current heads. On a 454, those 315 heads are going to want some rpm and compression; if it is a basic high perforance street motor the Brodix are probably a better choice. wengines. 300 Intake 1. 725 Max Lift, Complete w/parts (Pair) General Recommendations for AFR Cylinder Heads: Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR. 880 Exhaust Valves, CNC Ported, Solid Roller Cam Springs . Part Number: AFR-3575. 94" RPM Air Gap, port height ---1. Jan 25, 2023 · Afr 265’s. The new Brodix line of "race right" heads have ex. Nov 23, 2003 · The AFR's are raised about . General Recommendations for AFR Cylinder Heads: AFR Heads, 3680 BBC AFR 300 Magnum Heads, CNC Ported, Solid Roller, 112cc AFR, Aluminum Heads, BB Chevy, Intake Runner 300cc, Combustion Chamber 112cc, 2. these heads flow very well for a 315 runner. If it is a Chinese clone of the current GM BBC head, then it is an Edelbrock knock-off. 300 238 201. 250" and 1. These oval port competition packages are available with hydraulic or AFR Heads, 2001 BBC AFR 335 Magnum Heads, Full CNC Ported 121cc AFR, BB Chevy, Aluminum Heads, Intake Runner 335cc, Combustion Chamber 121cc, 2. AFR's 335cc BBC Enforcer cylinder heads feature their Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners, and combustion chambers that allow for extremely accurate and repeatable port location/performance. 850 Max Lift, Complete w/parts (Pair) Oct 7, 2021 · This is for a 496 12. 550 Hydraulic Roller Springs . Sep 29, 2015 · This is where we will put the review of the head for the board. 5 Bore fixture. shifting at 6300 rpm. AFR 335cc Enforcer BBC Cylinder Heads. Shop Cylinder Heads at Summit Racing. Jun 22, 2011 · - Edelbrock Performer RPM 6045 Heads - Comp cams XR286-R solid roller camshaft (248/254@0. 050 lift. Oct 2, 2008 · Magnum 325cc BBC Cylinder Head AFR's Magnum heads are available with a variety of upgrades, ranging from intake port sizes starting at 305 cc all the way to 357 cc. Anyone have actual dyno results of there 496 with 290cc heads. They boast 100 percent CNC-ported intake, exhaust, and chambers—as well as A356 aluminum casting and high-quality components throughout. I currently have a set of Edelbrock Performer RPM Rect port heads on the shelf I am considering using. Check out the details and corrected power here in this install! Are these heavy, cast-iron, rectangle-port BBC heads still the Jan 30, 2020 · Hey guys this is my first post. 05 107 split 850 Quickfuel,Air gap intake, th400,12 bolt with richmond 373 gears. 99 or more! AFR's 335cc BBC Enforcer Cylinder heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. Just by comparing the manufacturers head flow sheets, they are not that much different. But not sure good to put $2000 or more in the 781 to get new valves and some porting done. General Recommendations for AFR Cylinder Heads: May 1, 2015 · AFR also offers 1/4- and 5/8-inch raised exhaust port configurations that may push the exhaust flow up as high as 300 cfm (nearly doubling the exhaust flow of a stock BBF head). 190 valved 049-781 will run with that CNC ported AFR head, because Im sure it will not! Its getting hard looking at those greasy GM head castings every week knowing how much work its going to take to turn them into a head capable of making 800 plus HP. Specifications: Intake Port Volume-265cc. 59@111 mph. I’ve personally seen those afr 265s make 600hp on the dyno with a mush roller cam and 10. General Recommendations for AFR Cylinder Heads: Our small port, high velocity 265cc cylinder heads are a cost effective choice compared to re-worked factory big block chevy cylinder heads. 300. The 315cc heads are AFR's largest and best flowing BBF heads! They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, and high quality components throughout with . You need all you can get lugging that behemoth around. 300 in. Just cammed a 489 with a set of the 290's, it made 797HP with a hyd roller. AFR's 3001 335cc BBC Enforcer Cylinder heads feature AFR Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. For applications above these limits shaft mount rockers are typically advised. They come standard with stainless steel 2. Combustion Chamber Size-90cc AFR's 325cc BBC Enforcer Cylinder heads feature our Permanent Mold "As-Cast" Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. 625 Solid Roller Cam Springs . Recommended for aggressive street, street/strip or race builds with displacements up to 540 cubic inches, operating up to 6800 RPM. Throats sized and SSR polished, 2. 300 Valve Guide Clearance - Your AFR Heads come with proper guide clearance (. 120" thick-wall pushrods. Apr 24, 2020 · Runner size dictates peak rpm power so the cylinder head size between a 350 and a 383 will be different, if you purchase a 180cc head for the 350 it can be ported for the 383 later on. 750" thick head deck, reinforced rocker stud bosses, and are equipped with premium one piece stainless steel 2. Still looking for 10. 5 to 1 (18cc dome) 489/496 BBC with AFR 305 (CNC port option) cylinder heads combos if anyone is willing to post with some dyno numbers. General Recommendations for AFR Cylinder Heads: AFR recommends the use of . 880" exhaust valves. AFR 457cc 18* BBC Magnum Competition Heads . John thinks his 427 will be real close to 700 with the 290 Flotec heads and roller cam. Sounds like the AFR 300's will be a game changer. 700 lift, 1050 QF carb 743@5300 and 851@7300 So make your own conclusions I review an AFR 265 BBC head and flow it on my flowbench and share the numbers. in. I give information about the Afr 300 cc Cnc ported magnum big block Chevy heads. Afr 290’s if you go the 496 route. Exhaust Port Volume-135cc. Jan 30, 2010 · I would be insane to think my basic 2. 550" springs. Valves are their spec, but are not the best quality or brand name. I've proved that theory wrong to many times. 89@102mph 1/8 mile 6-24 L-29 461 BBC 11. 0,3. this will be a local budget 275 radial n2o deal. Don't fall into the larger head is ok when a blower. 850 Lift, Pair Find AFR 265cc Oval Port Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 265cc Oval Port Magnum BBC cylinder heads are designed to be used on engine displacement up to 468 cu. 400. Jan 10, 2013 · Tony Mamo the R&D guru at AFR has made an agreement with myself to rework, tweak, upgrade, or otherwise massage the high velocity, medium size ports on his design AFR 335 heads that I purchased through Chris Straub. High Volume/Pressure Oil Pumps - If you are using a high volume or high pressure oil pump it can submerge the valve seals in oil causing smoking or oil consumption Nov 23, 2015 · Just wanted to post these results of a 565 inch BBC with a pair of Mamo prepped AFR 300 rovals. 880" If we have time, 4. Oct 16, 2012 · GM now uses the Edelbrock designed & produced head(s) & intake(s) for BBCs. Figuring on AFR 290cc BBC Magnum Competition Heads . Tony will be modifying the heads in his shop at home. Write the First Review. 790 lift. This is what I would call a street racer type engine, that will be driven very little, like 1000 to 1500 miles a year== It will made 700 to 750 HP, and it will run on 91 Oct 11, 2008 · AFR 305/315cc Magnum BBC Cylinder Heads Cylinder Heads, Competition Porting, Aluminum, Assembled, 121cc Chamber, 315cc Intake, Chevy, Big Block, Pair . will be on race gas. 400 300 252 Dec 7, 2024 · The AFR Magnum 300's were the only head that day that made over 700hp. 6 and the AFR Jul 4, 2016 · Retainers AFR uses are for triple springs, inner springs are not located by step. Their big oval port is matching what many rectangular port heads are doing these days. thick cylinder head deck, reinforced rocker stud bosses, and premium one-piece stainless steel 2. 2 compression, AFR 290 Heads cam 617/. Nov 11, 2024 · I decided to a buy the AFR 4910 intake for my 502BBC with 265 AFR heads. The upgrades are almost too numerous to list, so we'll take a look at the as-cast, CNC bowl-blended, aluminum Magnum 325cc intake port head. 300/1. 880 valves, 13. nothing carried over except heads. Shims under spring cups are not full outer diameter of cups, more like you would use for 1. 43 60" 6. For a 383 I would use a runner size of around 195-205 cc if you want peak power around 6500 rpm and gearshift of 7000-7500rpm 300-25 intake is a good choice as well May 2, 2020 · The AFR Enforcer casting is the exact same head casting you can get on Ebay for $166/ea bare for the SBC version. qypvyitnwewimguqwildgfcfabfgydplakyppxfozsavfkzgpcntvad