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Originally Posted by fastco Hello from cross the pond the question we'd like to answer is do AFR's full CNC ported heads out flow & out BHP & torque other companies cyln heads with the same stated runner cc & full CNC port work done to them and do they out perform all others by a country mile as they would have us all believe.
This question has been raised 1,000's of times both side of the pond.
If we look @ AFR flow chart specs in there ads they certainly look to be a head of the pack . But are they really that much better for the price paid 100's of P/S more, then other manufactors heads is the big question.
A little tid bit of info for you chaps might shine a little light on why there flow #'s do exceed others heads AFR flow tests there SBC cylinder heads using a 4.500 dia bore not a 4.00 or 4.125 dia bore as we all know there is no SBC engine with a 4.500 bore & flowing heads using this 4.500 dia bore will greatly increase the flow #'s due to valve unshrouding & volume of the larger bore VS
a smaller STD Chevy bore of between 4.00 for 350 & 4.125 dia for Chevy 400 cid engines.
Now this test is not for bashing AFR at all they do surperb work & there heads a high standard race proven head ...... but the big question remains are there heads really that much better then the rest eg: Ed's Canfields , Brodix , Trick Flow , Pro-Comp RHS , Dart , World ect ect.
We 'll be testing AFR's 210 cc runner heads on our Chevy 383cid engine @ 10.4:1 comp with the same bottom end as the last engine dyno test we posted
That engine was loaded with Pro_comp 210cc runner heads made 477 BHP @ approx 6300 RPM & 469 ft lbs torque @ approx 4400 RPM.
Now we'll see how AFR's 210 cc heads compare to them, looking @ ARF flow charts there should be a great increasement in BHP & torque.... will see & post our findings & dyno's print out & DVD of dyno test.. just for fun.
Cheers! Dr,Dee |
Hello mates we've just completed the dyno test on CRC members engine with ARF's 210 CC 100% ported heads & the #'s are in & the BHP & torque figures are in... The big question was do the AFR's wipe the floor with brand X 's 100% ported heads?
Well the answers to that is no & yes in my opion..... anyway will post full spec on both engines & leave the answer to that question with the facts presented speak for them slevles in regards to BHP &torque that both engines produced's & let the members decide who's won this battle.. ..... remember there are variables here but all in all it's was a close call.
Okay here is video of yesterdays dyno pull with AFR's 210 cc runner heads on Chevy 383cid engine with hyd roller cam... with very close specs as flat tappet cammed 383cid engine with brand X heads... right i'll post both dyno print outs & specs of both engine...... lets compare the REAL WORLD #'S not fudged or stretched #'s & beware this is only a key stroke way on dyno computer . Cheers! Dr,Dee
Go here for video of AFR heads loaded 383:
http://s4.photobucket.com/albums/y14...gAnch=imgAnch1
Photo of AFR head loaded engine:
[IMG]http://thumb16.webshots.com/t/53/453/5/61/55/2804561550087216316GQzu
KF_th.jpg[/IMG]
Photo dyno print out of AFR head loaded 383
