GT/AA Class War At Indy

[Lynn A McCarty]

Originally Posted by Mark Yacavone

The 454 combo is a 1975 engine . It's factored to 325 in GT. Looks like the small port head is 45 hp less .
Sounds like the truck motor in a passenger car. I wonder how they designated the difference back then, or did they? Maybe it is a superceded truck head.
Where's Dwight when we need him?

220 ccs small port? Ha Ha Mark that is a good one! So if they had to run 188cc?