AFR heads greatly out perform other manufactors heads hand d

[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

[Clarkson]

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

Let us know the results!

I have got great results from my AFR'S on my engine!:thumb:

[Big Thirsty]

Hello Daryl,

Hope you are well and look forward to hearing the results.

Best regards,

Ian

[BenBaron]

Hi Daryl,

if you are looking at the performance gained from swapping heads then how are you going to make the CR the same for both sets? as I understand it the AFRs have a little tiny 58cc chamber whilst most other are a bit bigger than that, so wouldnt that in itself make a fair difference?

Ben

[dingocooke]

Just looked at Edelbrocks specs on their webpages.
For SBC you can have either 64cc or 70cc, for SBF they have 60cc chambrs, so Ben has a point if the AFR's have only 58cc it will be a difficult comparison, although, for somebody contemplating doing a head swap from Ed's to AFR's it will probably represent a real world situation, although not as clear a comparison if the engine when running with Ed's or whatever was running at the same effective cr.

Looking forward to seeing the comparison, should be very interesting!

Steve

[JamesP]

210cc AFR's come either with 68cc or 74cc chambers , SPEC Racing heads 66cc only.... so you have a choice, matching the CR (or at least getting pretty close) shouldn't be a huge problem.

As a note most of their heads come in the 68cc or 74cc versions.

PS, 195cc 68cc heads on my 383 SBC with CR 10.2 with Flat Top pistons

James

[fastco]

Originally Posted by JamesP

210cc AFR's come either with 68cc or 74cc chambers , SPEC Racing heads 66cc only.... so you have a choice, matching the CR (or at least getting pretty close) shouldn't be a huge problem.

As a note most of their heads come in the 68cc or 74cc versions.

PS, 195cc 68cc heads on my 383 SBC with CR 10.2 with Flat Top pistons

James

Yes James you are 100% correct.. we are to load AFR's with 68cc chambers... the other heads are 69cc chambers give'n a 1 cc differance = nil .

PS: Hello Ian & the lads & Ello Ello....alls well cross the pond.. see you soon @ a show in the UK ...
Cheers! Dr,Dee

[JamesP]

Dr Dee

Looking forward to seeing these results, fingers crossed that I didn't waste a load of money on the heads - but then they are really beautiful bits of work - God I'm getting sad.....

James

[mikey]

Performance Chevy did an article about two years back, I think it was on the back of an article called the rat motor or the mouse is back or something like that. The AFR's ot performed all the others and as iI remember they gave about 6 to 7 BHP over the Victor Juniors.

By the way, AFR chamber sizes are to order, but if you want anything below around 58cc ish- cant remember the exact volume, you have to get them angle milled. However they will also mill the inlet plane so that your standard 23 deg configuration works.

Mike

[fastco]

Originally Posted by JamesP

Dr Dee

Looking forward to seeing these results, fingers crossed that I didn't waste a load of money on the heads - but then they are really beautiful bits of work - God I'm getting sad.....

James

Not to worry James as i stated AFR is a leader in the cyln head design & R&D( with some bending of the rules.. but most companies do) & they do top notch machine work some of the best out there for sure.
This test is just to compare AFR's CNC ported heads BHP & torque numbers to Brand X heads that are CNC ported & both heads with the same runner volume on the same engine. Brand X heads costing much less then AFR heads
we are curious to see the differance in BHP & torque between the two, 6 to 7 BHP spead would be very interesting to say the least....were hoping for much more of a gain with the AFR's.Remember these engines are street engines not all out tricked race engines...
Keep you posted mates! Regards Dr,Dee