Over the winter I had my block bored .030 (using the same stock # pistons) and the AFR205's. All other major components of the motor and car remained the same. Same cam, valve springs, intake, carb, transmission, and rearend. Same ignition curve and timing. Even used the same old spark plugs and wires. Same 1011-2 head gaskets.

Last years best track time was a 11.72@116.92mph. This year I have gained over 4 mph and have run a best of 11.521@121.29mph. That is about a 50hp gain at the flywheel, primarily (40hp or more) from the installation of a good head, in this case the AFR's.

That should pretty much prove how much gain a good head has over a ProComp that has been worked over.

See http://www.fordmuscle.com/forums/dra...cing-cake.html and judge for yourself.

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Dennis
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65' STANG (3330 lbs), 393W NA, Toploader 4 Spd, 4:11 TrueTrac, AFR 205's, Vic Jr. Intake, CI Custom SFT, 750dp, 11.0 CR

11.52@121.29mph