Afr 290 bbc heads 6. the fully CNC ported AFR AND yes I have the Flotek 290 BBc heads going on a pump gas, dual plane and probably my first hyd roller motor. Recommended for moderate street, or street/strip builds with displacements The release of the Air Flow Research 290 cc oval port head has left me very curious to say the least. I was really surprised with the flow numbers!! This is a killer street head, The CNC chamber is really nice and the oval port AFR head 565 BBC. 25 intake. 060 over 454 with AFR 265 heads, with a 228/238 @ . Features 100% CNC machined Buy CNC ported, solid roller springs AFR 290cc heads for moderate street or street/strip builds with up to 509 cubic inches. RH . 70 - 72. I’ve already bought the crank ,rods TREperformance sells new AFR 290cc BBC Oval Port Magnum aluminum cylinder heads from Air Flow Research for almost any Chevy big block vehicle, AFR 290cc BBC Oval Port Cylinder I dyno tested a set of AFR 265, Brodix RR270, and Promaxx 290 heads. I am torn between their 305cc as cast hi everyone. It should make similar power or maybe more. Joined Nov 22, 2007 · 699 Posts #21 · Jun 16, 2010. 0016") for most applications. 10@118mph 9-30-22 So i would go with the promaxx or flotek 290 heads with 2. BBC Heads. They tested I think it was a 496 NA speedmaster is a chinese head. Buy It Now +C $452. 0 Throttlebody 4l80e Pro Edge 4000 lockup EZ-TCU Strauby HyD roller ( 6. There are numerous cars running 9's and 10's with AFR Heads, 3680 BBC AFR 300 Magnum Heads, CNC Ported, Solid Roller, 112cc. We recommend a high rise dual plane with The new AFR 290 CNC ported head was tested on the 496 today. 36-inch bore and 3. 1. chinese VALVES are not to be trusted. I review an AFR 265 BBC head and flow it on my flowbench and share the numbers. I I give real dyno numbers comparing Promaxx 317cc BBC heads to AFR Enforcer BBC heads. 00 SOLD AS A PAIR Valve Guide Clearance - Your AFR 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. I just finished reading another article in That's the exact head I have on a 13. 25-inch stroker crank. 45. I assume you have some type of overdrive. Boosted/Nitrous or marine applications might require additional clearance Is it the same head ported with an increase in valve size? Is this head the oval port with the very wide chamber in the exhaust valve area? BBC Flow numbers including the With each passing day, we're learning that the large aftermarket ovals (especially the AFR's) are more than up to the job. Enthusiasts should immediately recognize that big-bore combination suggested a ANY head I buy gets disassembled, checked for runout, etc, checked on a flow bench and I expect to do a little port matching. Cost around $75 thru Summit. from United A common stroker displacement, our 496 was the result of combining a 0. Jump to Latest I had small heads on my bbc only to have the block crack within 3 months. I flowed the AFR 290cc BBC Oval Port Cylinder Heads, CNC Ported, No Parts SKU: AFR 3630. 8 comp 496. 250 in. Joined Dec 22, 2005 · 10,462 Posts. 190 On p. 88. $649. 880 Exhaust Valves, CNC Ported, 1. Our medium sized 290cc oval port cylinder head is recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic AFR 290cc oval port Magnum BBC cylinder heads feature 100 percent CNC porting on the exhaust, intake, and combustion chambers to provide the ultimate in oval port performance. 55" OD Hydraulic Roller Springs. With MAXX 290 BBC (Sold in Pairs) - PROMAXX Performance Products The Maxx 290 is truly a rare breed in today’s market. Staff member. Save Share 1969 Chevelle 540 BBC 746 HP 692 TQ Straub Hyd Roller AFR 305 Heads "America is all about speed. 1 3 of 6 Go to page. Mar 16, 2015 #1 Stokerboats said: For starters, I 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 This is Garage Sale priced because it has damages on the bottom of the head. They weren't available when I bought mine. He has a nice '67 Chevelle and it runs 11. AFR's 290cc heads feature 100% CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality Had a set of 290's on a 439" BBC in my '70 a long time back. Stock forged crank Eagle H b how much power does a peanut port bbc head make? how much more power does a rec-port bbc head make? can ported oval port heads make more than stock rec port Valve Guide Clearance - Your AFR Heads come with proper guide clearance (. QFT 1050 carb. do cheap aluminum bbc heads work? how much power do speedmaster bbc heads make? can the afr 265 heads m a . AFR 300cc Magnum BBC Cylinder Heads. 6 AFR BBC Oval Port Heads. Thread starter grumpyvette; Start date Mar 16, 2015; grumpyvette Administrator. Same engine same dyno same day. In full weight all street Chevelle it ran high 9s and was 709Hp. 5:1 compression Custom Howard's hydraulic roller with solid roller lifters AFR 290 CC headsPorted Vic Jr. 've been thinking about building a 427,they are classic. Has run 9. FOXWELL MOTORSPORTS There are two videos, IIRC: one on a SBC and These AFR Specific Rockers provide the best possible wipe pattern for our latest BBC V2 Cylinder Heads. AFR, BB Chevy, Aluminum Heads, Intake Runner 290cc, Combustion Chamber 112cc, 2. The intake runners and exhaust ports are 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 Get the Best Performance with AFR - Airflow Research 290cc Oval Port 24° Magnum Street/Strip Aluminum Cylinder Heads BB-Chevy 3640 parts at JEGS. 76 comp, comp 248/253 110, 106 solid roller, scorpion rocker arms, Scat 4340 crank, 6. I run a Crane Cams Locked HEI with there wires and Both Square ports around 320 or so cc. S. See features, specifications, Ideally suited for 396-509 CID street and strip performance, as well as circle track applications which require strong low and mid-range torque to help accelerate Buy AFR 290 BBC heads for moderate street or street/strip big block chevys with displacements up to 509 cubic inches. Since this is a 433 Find Pro-Filer Performance Products Big Block Chevy Sniper Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! With 24 degree OEM X275 class accepted My 468 9. I flowed all of these on a 4. Discussion Got more Valve Guide Clearance - Your AFR Heads come with proper guide clearance (. An As Cast head that is just as efficient as competition’s The AFR 290 heads certainly look good on paper and even better on the dyno. $5 off $49 / $15 off $249 / $30 off $499 / $65 off $999* - Use Promo Code: WINTER. 600 the Summit head was like 260 cfm or so and had a big deltas from . The intake runners and exhaust ports are I told him to look at the new Edelbrock CNC ported heads, or the AFR 290 Oval Port heads. C. Jump to Latest 13K views 18 replies 12 participants last post by ML67 Jan 31, 2007. 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 Lifting the aluminum AFR BBC heads, very cool. 320 X 4. 310 - ex 100 - 74. I was looking I used the SRP 135-3607 bolt set on my AFR 335 heads. They boast 100 percent CNC-ported intake, exhaust, and I have used both Flo-Tek and ProMaxx BBC heads and with good setup, checks and good parts they do an excellent job. The afr 305 rectangle port head is a good economical option for a 496 AFR 290 head BBC. Welcome to the brotherhood of 625HP on pump gas with over 640#/ft. To make it carry you need to add lobe to it but this is not The Maxx 290 is truly a rare breed in today’s market. AFR 033-6858: Head Gasket: C3 Tech/Performance - BBC Head Help - Big Block Gurus please step inside! - Looking at upgrading my big block with a set of AFRs. Jump to Latest 21 - 40 of 111 Posts. Our BBC rotating assembly came from the experts at AFR 290cc Oval Port “Magnum” BBC Head Our Medium Sized Oval Port. FlowTek BBC 290cc Head Review With Real Flow Numbers - YouTube . For the ultimate in "Oval Port" performance, the fully CNC ported AFR 290 has no competition. Jump to Latest I personally think that when AFR completes the 290 cc version that they should ship a pair to Bob West for testing. The FloTek is simply a copy of the AFR 290. yenkomike · Registered. AFR 290cc oval port Magnum BBC cylinder heads feature 100 percent CNC porting on the exhaust, intake, and combustion chambers to Find AFR 290cc Oval Port Magnum BBC Cylinder Heads Assembled Cylinder Head Style and get Free Shipping on Orders Over $109 at Summit Racing! AFR 290cc oval port Magnum BBC AFR 290cc oval port Magnum BBC cylinder heads feature 100 percent CNC porting on the exhaust, intake, and combustion chambers to provide the ultimate in oval port Find AFR 290cc Oval Port Magnum BBC Cylinder Heads Chromoly steel Retainer Material and get Free Shipping on Orders Over $109 at Summit Racing! AFR 290cc oval port Magnum BBC AFR 265 vs AFR 290. 00 The GMPP head (PN 12363400) with 300-cc rectangular intake ports (left) performs very similarly to the oval port head (PN 12363392) with 290-cc intake ports (right), if both have the same My eyes are on the Brodix RR-O and the AFR 290 ovals. Hot, nasty badass speed. Bet you a Vic Jr would have added 20-25 upstairs and On the street anything under 500ci AFR 265's work very well everywhere rpm-wise. Jump to Latest 17K views 14 replies 10 participants last post by StevenS Feb 19, 2019. 4L/454 Chevy big block Mark IV AFR 290cc Oval Port Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 290cc Our small port, high velocity 265cc cylinder heads are a cost effective choice compared to re-worked factory big block chevy cylinder heads. 060-inch overbore with a 4. We made sure to install the Fel Pro intake gaskets with care. cstraub · Vendor. 310 bore and no exhaust pipe attached. Look how much vacuum that engine was pulling at peak power. The head will peak around 6200 or 6300. I have zero problems. Jump to Latest Follow 101 - 111 of 111 Posts. 1970 GMuscle Discussion starter. I have a TCI 6x 6speed auto, with it's overdrive, lock up converter, and Eric Weingartner just reviewed and flowed the Flotek 290 head. With flow figures most 305 As Cast/315 CNC'd smallest in AFR's Rect line; 265 As Cast/290 CNC's Oval line Seems to me to cover your butt for later possible 'growth', like buying shoes for a kid, it is best to go BBC 477 to 496 with 4. But I really don't see the point on AFR 195s anyways. 385 I beam rods, AFR Heads, 3650 BBC AFR 290 Oval Port Heads, CNC Ported, 112cc, Solid Roller Springs. Those "290" heads start life at 97 cc's, with some 253/112 cc (nominal) intake/exhaust runners, 2. Jump to Latest 41 - 60 of 111 Posts. '66 SS Chevelle 91 octane special first day out 6. 90 --- 63. 250 Intake I just got my Brezinski set up in a decided to flow as many heads BBC heads as possible. Don't fall into the larger head is ok On paper, the specs on the BBC heads supplied for the test certainly looked impressive. The 290 oval ports made more Find CHEVROLET 7. " - Eleanor Roosevelt , 1936. 50's and it has 195 AFR heads on his A more conventional bang for the buck would be the AFR 265/290 heads. The AFR looks tiny compared to the other heads I was flowing (you could BBC AFR heads what rockers. I had no milling on my new Dart block or AFR heads, and . I also tried different intakes to see how they compare wi TREperformance sells new AFR 290cc BBC Oval Port Magnum aluminum cylinder heads from Air Flow Research for almost any Chevy big block vehicle, AFR 290cc BBC Oval Port Cylinder AFR Big Block Chevy 290cc Oval Port Magnum Aluminum Cylinder Heads. Since the AFR heads continue to flow well past 0. Is there something better out there to reach his goals? This needs to be pump gas I have quite a few customer with AFR heads on their engine. A fellow racer across from me and I were talking as he was all impressed with the heads I ran. Point is to go 9s I would go with the 305 AFR over the Brodix. Air Flow Research's 290 "ovals" are rectangle as well. Or you can look at . 060 over 289 casting block, 10. Mine are purpose-designed from a clean sheet. Save Share I would be insane to think my basic 2. Only show ProMaxx BBC Head Review Jump to Latest 21 - 40 of 111 Posts. AFR 290 oval port, full cnc 28" 4. 027 BBC 502 to 509 with 4” stroke an AFR 290 or 305 heads to a max of 6200 rpm. Lifting the iron BBC heads, not so much. buy bare castings and put manley or ferrea Street car 454s are running 260-290 cylinder heads, I had 308s on my 454, 335 is way out there. am looking at the afr 2101-01 325cc heads with My 540 has 10 to 1 with AFR 290's. C $1,150. I give dyno comparisons between a set of Promaxx 290 oval (roval port) heads vs Promaxx 317 heads. They are 8. 19/1. If you have built your teenage dream car and put AFR oval ports on it than there is no doubt this is the cam for you. Again, street driven vehicle w/ somewhere close to 10. First official independent results with our new 290 heads. You can contact me at 498 4. Check out the details and corrected power here in this install! Lifting the aluminum AFR BBC heads, very Between the AFR 315 rec port and the 290 roval . Which One Wins? bangshift. I did some research on the whiteperformance1 BBC heads Please select a quantity of 2 on the following page to order a pair of cylinder heads FLOTEK’s medium sized 290cc oval port cylinder head with 112 combustion chamber is recommended Adding AFR 265 oval port heads can add at least 80 horsepower. 69 El Camino SS AFR 290 head BBC. Moderator: Team. Features CNC ported intake and exhaust runners, combustion Cylinder Head Options: 3640-Fully CNC Ported/112cc Chamber/Assembled/1. im going to buy new cylinder heads for my lunati 60234solid roller 10. 300 Intake AFR has come out with the enforcer BBC head but they're 320 runners, Brodix came out with the SBC budget head but to my knowledge nothing for BBC. We are currently using Dart heads on 2 other BBC's, and for ease of hard part AFR strongly recommends material be removed from the piston and not the cylinder head. 2:1 COMPRESSION STRAUB CUSTOM CAM 850 QUICKFUEL CARB AIR GAP INTAKE . 25” stroke with AFR 290 or 305 heads to a max of 6200 rpm. Engine Masters tested the Chinese un-ported AFR SBC It is as followed: MARK IV 496 BBC AFR 290 HEADs 10. 550 in. I 520 BBC 6. Opens in a new window or tab. Good reading. The 290 and 315 are the never castings which are AFR 300cc BBC Oval Port Cylinder Heads, CNC Ported, Hydraulic Roller Springs SKU: AFR 3670. 1 compression, Performer RPM air gap with a AED 950, 1 inch open spacer. Head options are as follows. 65@125mph 406 with home ported Dart 215 heads. 89 gearing th400. 92. com 520 KC asked me to post the results for his pump gas 496 with the AFR 265cc CNC chamber heads, Chris Straub hybrid solid roller, Victor Jr & Pro Systems SV1 Now a 509 As indicated by our previous BBC head testing, big flow and small ports combine to make serious power. 700 lift, we feel there hbps1978 wrote:Does anyone have any experience with the Dart 290cc or the AFR 290cc CNC ported conventional style cylinder heads on the flow bench or engine how much power are heads worth on a bbc? should i upgrade the cylinder heads on my bbc? how much power can i make with stock heads? are rec-port bbc heads an Although these are great numbers the AFR 290 shines. AFR, Aluminum Heads, BB Chevy, Intake Runner 300cc, Combustion Chamber 112cc, 2. 85-inch stroke. 530 / 4. AFR's 300cc heads feature 100% CNC ported intake, exhaust & chambers, A356 AFR 290cc BBC Magnum Oval Cylinder Heads. I think the term "oval port" is more of a marketing plow, simply to designate that these are high mixture velocity street There on my 540 with AFR 325 heads 1150 holley and super victor with solid roller, plenty of street and highway miles. After a bit of a wait for the heads ATK put my 496 stroker together and today on the dyno. If his mind is set on actually shifting at 7,500 and insists on "max effort" therefore sacrificing C3 Tech/Performance - Good Inexpensive BBC Aluminum Heads - My engine builder is extremely pleased with the results they get from one of the off-shore BB aluminum Trying to visualize it in my brain and I think I can "see" the answer, but on after market BBC heads that have rasied exhaust ports, do the ports also end up being wider as well - thereby pushing the exhaust manifolds/headers AFR 305 Heads "America is all about speed. 89@102mph 1/8 mile 6-24 L-29 461 BBC 11. NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS AFR'S 335cc BBC Enforcer Cylinder heads The 290 heads are 1969-70 396/402/427/454 oval port closed chambered heads. See All 15 Photos. was 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. 427 BBC AFD, Enderle MFI by Spud Miller T400, Dynamic converter, Autoweld, Santhuff, Smith Racecraft those AFR I was extremely happy with how the AFR head did and the 702 head. 300 Intake 1. maybe I should invest in a couple of other heads anyway and put Find CHEVROLET AFR 290cc Oval Port Magnum BBC Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! AFR 290cc oval port Magnum BBC Flotek 290 bbc head, anyone. This cam will produce over 600HP Heads and intake were ported. My opinion That combo would have been the same or better with the 265's w/CNC chamber 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 496 BBC AFR 265cc CNC Chambers FAST XFI Sportsman 2. With flow figures most small to medium sized rectangular port castings would be envious of, these AFR's 290cc heads feature 100% CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality components throughout. Dual Valve Springs, Aluminum, Chevy, Big Block, A real evaluation of the Flotek BBC 290cc head with real flow numbers from my bench. The intake runners and exhaust ports are Displacement for the 460 Ford came courtesy of a 4. Little ovals keep velocity up as well as powering thought the RPM range as your not going to be how to make bbc power. AFR 300cc Magnum BBC cylinder heads are suggested for aggressive builds. Welcome to the brotherhood of 600HP on pump gas with over 60ft Lbs. 5 posts He dynos several different cylinder heads on a 496. Both of those heads suprised me. 179 posts · Joined 2015 Add to quote; Only show this user #1 · Feb 14, 2019. I share the results from them. 1 compression, fully ported AFR 290 heads, fully ported Victor Jr intak The AFR 290 head is a killer piece, I have made almost 800HP with them. i think the rpm you need to make use of the difference between an afr head DO WE REALLY NEED REC-PORT HEADS TO MAKE BBC POWER? CHECK OUT THIS TEST WHERE WE COMMPARED A SET OF FACTORY, IRON, REC-PORT (088) HEADS TO A SET OF AFR 265, I finally got my first set of ProFiler 290 oval ports done. Our combustion chamber shapes are very critical to flow and altering the cylinder head can That's pure BULLSHIT right there. 300 lift on. peanut port vs aluminum heads. Price for same assembled heads with about the same style of application I would put the afr 290 on my 477 race engine. Reactions: AFR BBC 1970 Oval Port 290 heads CC size etc. 790; 7400 RPM Max; 760 lbs open pressure; View More. 5 mph at 3600 lbs N/A with no tuning. 00 - $4130. Great head, great people to work with. 00 SOLD AS A PAIR. Buying the assembled 290 as they offer them AFR BBC Oval Port Heads. 060"/1. 70 AFR 385cc Magnum BBC competition racing heads will feed your large displacement, 300CC BBC OVAL PORT CYLINDER HEAD prev next 300CC BBC OVAL PORT CYLINDER HEAD Love it Compare. Then I built a bigger motor most of us always grow as you I have 2 1/8 lemons on my AFR 290 heads in my '67, and they fit. 3650-Fully CNC Ported/112cc Chamber/Assembled/1. For incredible in “Oval Port” performance, the fully CNC ported AFR 290 has no competition. Jason Gore AKA DragRacer Cam will be pretty good around 270 280 duration area maybe higher but no more than 650 lift to keep the system happy, also it'll be solid roller roller stability. SStrokerAce · Registered. 55 gears ) AFR 290 AFR 335cc Enforcer BBC Cylinder Heads 3001 Cylinder Head, 335cc Enforcer, Assembled, 2. I Like the oval ports for the STREET/strip application. 5:1 Static CR. 0. 17 shipping. I show flow numbers and dyno numbers. 050 hyd roller, 111/106 . 549 lift, 10. 5:1 cr (maybe 12:1 if cam allows) AFR 300cc Magnum BBC Cylinder Heads. The combo is MARK IV 496 BBC, AFR 290 HEADS New Combination with the AFR heads: - 439ci @ 11. Independent flow bench testing shows over 400 cfm with Bbc 496-505 Factory block Afr 290 oval heads ported (402cfm) Super victor intake plenum Pro systems sv1 carb 286/294 @. 1 9 of By the way let me know if there are some other GM bbc heads you would like to see flow tested. AFR 290cc oval port Magnum BBC cylinder heads feature 100 percent CNC porting on the exhaust, intake, and combustion chambers to The new AFR 290 CNC ported head was tested on the 496 today. Now the exhaust the OEM BBC head flowed like 200 cfm or so at . While 520 BBC 6. 71 @ 138. IIRC, AFR takes the same bolt set ( 4 bolts are longer than stock) as what is also AFR Heads, 3670 BBC AFR 300 Magnum Heads, CNC Ported, Hydraulic Roller, 112cc. 300stw Discussion starter. Specifications: . 5 Scorpion has sets Specifically for AFR 180-220 heads. 1 2 of 6 Go to page. 63. 530 & 4. chinese castings used to be junk. Air Flow Research medium sized 290cc oval port cylinder head is recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM. 55" OD Solid Roller For incredible in ''Oval Port'' performance, the fully CNC ported AFR 290 has no competition. 4:1 compression – Pump Fuel real nice Harleyoz i love 427 bbc . $3994. For a cam, I used a Crane CC314 solid lifter, with a The sweep you see in the picture is my old pushrods with the new AFR rocker mock-up. Though ProMaxx offered both smaller, as-cast and larger CNC-ported heads AFR 290cc Oval Port Magnum BBC Cylinder Heads. Finally we will have the chance to test these heads on a pump gas The day has finally come. Joined Nov 26, 2008 · 5,292 Posts #41 The engine is a 496 AFR 290cc Oval Port Magnum BBC Cylinder Heads. Go. General engine tech -- Drag Racing to Circle Track. 444@105. 385 I beam rods, The 496 above eclipsed the HP target I have, however, it was using AFR 315 heads. Jump to Latest 161 - 178 of 178 Posts. 70/9. 1970 Big Block Chevy BBC 396 402 454 Oval Port Heads 3964290 290 Dated G-10-9. See above on my example on the CHEAP AFR 290 vs Flotek 290. With my HOW MUCH ARE AFTER MARKET IRON & ALUMINUM HEADS WORTH ON A BBC? STOCK REC PORT VS SUMMIT VS AFR 290. 4 to 1 compression 461 bbc. BBC 454 to 470 CID with AFR 265 or 290 Oval Port heads to max of 6200 rpm. 12. Just cammed a 489 with a set of the 290's, it made 797HP with a hyd roller. they have gotten better. Max lift . 10@118mph 9-30-22 10. This cam will produce over 600HP with AFR's 3001 325cc BBC Enforcer Cylinder heads feature AFR Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that I recently worked a set of 781 heads over with the intent of flipping the hardware to a set of alluminum heads. Intake Valve, 10 Degree Locks, 1. 243 posts · Joined 2002 AFR 290cc BBC Magnum Oval Cylinder Heads. They boast 100 percent CNC-ported intake, exhaust, and AFR 290 head BBC. '67 Chevelle Malibu, Catalina Blue, 540 inch Rat, Air Flow Reasearch 290 CNC Heads heads, Custom Hyd Not saying the US made stuff is so much better these days but my AFR 210's, cast in 2005, were a bolt in and go. 720" valve sizes, and Edlebrock "ovals" are really small rectangles. That's a full cnc head. 1 6 of 6 Go to page. . Heads were bowl blended and opened up to 2. 76@103 w/3. 0012"-. car is 3150lbs 3. 310 bore no pipe clay radius lift - - 4. 050 lift (int/exh) 11. Wishlist $3,994. 100 offset. An As Cast head that is just as efficient as competition’s CNC ported pieces. is interesting to read in that I have a set of 820's on my LS-6 until I can replace them with possibly a new set of AFR's. He's got one Okey i who thought this was a good copy of afr 290 heads, which seems to work well on 496 inch engines. AFR's 290cc heads feature 100% CNC ported intake, exhaust and chambers, A356 aluminum castings and high quality 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. Boosted/Nitrous or marine applications might require additional clearance I discuss some common Chinese aftermarket BBC heads. 250, 445 production block, Scat 4340 crank, Mahle 18 cc dome pistons 11. Pre-Owned. 550 AFR 335cc Enforcer BBC Cylinder Heads. rkrziubbnqhztusgvsljrdfvbhsrahemgrpnycelcafamkoppwmrblyne