I know this is for the firebirds , but I have to add this. I have a 73 GTO that I wanted to build it as close to an SD car a possible because when I ordered the car I ordered an SD car but of course the order got canceled several times before it was gone for good. I took a left over they had on the lot. After driving it for 29 years with a few mods I built the engine thats in there now. E-heads SRP forged pistons, Cranes Blueprint RAIV cam, Eagle H-beam rods, 1:65 roller tip rockers, RAIV exhaust manifolds, Performer RPM intake, roller gear & chain, Pertronix ign., a modified Q-jet, X-pipe exhaust, M-22 4 spd. 3:73 rear gears. The heads are as they came out of the box, the engine has been completely balanced within 1.5 grams total, block decked just to make sure it was completely level front to back, side to side. I don't know how far the pistons are in the block. OH, this is a 455 + .30. This engine runs really great. It is faster then any SD I've ever got to drive. The car runs 11:50's at an avg. speed around 118-122. I can say nothing but great things about the E-heads when used on the 455 block. With the way I've built this engine I'm sure this is what it would have been if I'd built either an HO or A SD & had reworked the heads back then. So I agree with 1971455HO in his assessment of his engine. If you want to make your HO or SD come alive you can rework the heads to the way they should have been or use a set of the aftermarket heads (Alum.) which will give your car the performance that it should have had from the factory.
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