Quote:
Originally Posted by oldskool
No !
Here's just one good example. It has long been published & is commonly accepted that the '68 400 D-ports had aprox 72cc chambers. Some say that many actually measured a little bigger. NHRA allows 65cc chambers. So, that's roughly a 10% reduction that NHRA allows. Obviously, that will increase compression & power.
http://www.classracerinfo.com/Engine...9&MAKE=Pontiac
Obviously, they didn't do that for the '75-'76 Pontiac 455.
Compression is obviously a factor that must be considered in determining the power potential & thus the competitive possibilities of a Stock/SS engine. The power potential must then be weighed against the current NHRA hp factor of the engine, to decide if it might be a good engine to use, or not. |
The 65 cc camber volume shown on your link came from PMD not anything that NHRA made up.
Stan