Originally Posted by blakethechop
i hope to get 450 hp with head ported and milled new comp cam new edelbrock rpm intake 800cfm carb roller rockers.i have read that pontiac under rated the horsepower on the 455 during the fuel crisis is that true
No they lowered the compression to save on fuel. It also made the engines turds. Happened to all gm and fords mopar.
I actually think the stock rating for the passenger car was over rated. But the sd and ho had some real good combos that slipped out of the factory. They only under rated for two reasons one to be lower than the corvette which gm still insist on the corvette being its fastest car. The second reason was insurance and a 290 hp motor was much better on insurance than a 325 hp motor.
450 should be a good goal. I think it will make it. But going to be tuff to hit with 8:1 compression.