The damage recently done

[Andrew Hill]

Originally Posted by Charley Downing

Andrew I don't see to many stockers with stock parts
Acid ported heads and intake
Aftermarket pistons, rods, valves, cams, roller rockers
Metric Trans that was never offered in the 1960's and early 70's
Your beloved 1960's and 1970's stockers are far from stock as new cars. Old combos are as much of the problem as new combs.

You're right that stock doesn't have nearly as much stock as it used to, but everyone has aftermarket pistons, rods, valves, cams, etc. Those rules are the same for all combinations, and it's a lot different than completely replacing an intake with a much better one, a completely different carburetor that flows 1.5x or more what the old one did, and a cam with larger lift. It's obvious stock has progressed a lot, but my car still has the heads that came on it in 1970, same with the untouched intake manifold, type of carburetor (yes it's an aftermarket one but the same design), etc. None of the new cars are as close to stock as mine, although some are close just with messed up HP factors. Even the ones like yours, essentially the motor that came in the Mustang GTs before the 5.0, have more compression that the stock ones.