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Author Topic: AFR 185 comp heads ET difference  (Read 2647 times)
premium67
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« on: May 07, 2011, 04:36:42 pm »
Just wanted to post this data point:

AFR 185 competition head 58cc swap from old heads netted .8 difference in E/T at the track.  Old heads were some mildly ported 69cc heads

289 bored .030 over with small Ford Racing camshaft .472/.496  214/224 @ .050.  X-celerator intake, 750 QFT annular booster carb, Thorley tri-y's.

T-5, 4.11, stock 2006 Mustang GT tires and wheels.

13.01 @ 106 (AFR 185) vs. 13.7 @ 101 (old heads)

Shifted at 6500 with new heads; 6000 with old heads. 

Cheers! 
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« Reply #1 on: May 07, 2011, 06:54:11 pm »
I take it the street tires are killing your 60'. Your 106 mph indicates mid 12 second potential.
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« Reply #2 on: May 07, 2011, 07:01:25 pm »
I'd be curious what the gain would be if you shifted at 6 with the new heads.
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« Reply #3 on: May 07, 2011, 07:55:03 pm »
Quote from: juiced coupe on May 07, 2011, 06:54:11 pm
I take it the street tires are killing your 60'. Your 106 mph indicates mid 12 second potential.
What He Said.......and great results with that A312 HFT cam/better flowing heads setup....

How does it "behave" streetwise?
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« Reply #4 on: May 07, 2011, 09:22:45 pm »

 I think a bigger cam and associated hardware ... springs, manifold etc would make a huge difference.
 The heads aren't the weak link at the moment and with that cam you aren't seeing the real
 benefit of the head swap.
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« Reply #5 on: May 07, 2011, 09:26:14 pm »
Camshaft is holding it back. A real camshaft will net 50hp or more.
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« Reply #6 on: July 01, 2011, 04:44:09 am »
Quote from: premium67 on May 07, 2011, 04:36:42 pm
Just wanted to post this data point:

AFR 185 competition head 58cc swap from old heads netted .8 difference in E/T at the track.  Old heads were some mildly ported 69cc heads

289 bored .030 over with small Ford Racing camshaft .472/.496  214/224 @ .050.  X-celerator intake, 750 QFT annular booster carb, Thorley tri-y's.

T-5, 4.11, stock 2006 Mustang GT tires and wheels.

13.01 @ 106 (AFR 185) vs. 13.7 @ 101 (old heads)

Shifted at 6500 with new heads; 6000 with old heads. 

Cheers! 

Thanks for sharing.  I had similar results on my 90lx.  Swapped the stock e7s and rockers for a set of tfs170s and 1.72 rockers, knocked off .71 and gained 7mph on a 1000ft track,  with the stock cam .
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90lx, stock short block, stock cam, TFS 170's, 1.72rr, 70mm Turbo, 11psi boost, on stock tune
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