Last Update 04-21-08
WE MAKE SERIOUS PONTIAC HORSEPOWER
AND WE KNOW MORE ABOUT BUILDING STOCK PONTIAC ENGINES THAN ANYONE.
In 2002 per two racers request NHRA refactored the 1973/1974 Super Duty horsepower down to
325 hp. The same as our 400 inch D-port 1968 combination. That means both cars now weigh the same.
The minimum weight for both combinations in 2002 was 3255 lbs.
The 455 stroke is 4.21 and the stroke of a 400 is 3.750.
That's a .460 increase for the 455. The playing field is considerd by NHRA somewhat leveled
by the fact that the 455 S.D. is lower in compression. After blueprinting the each engine
you can expect around 9.25 Cr from the 455 and 11.0 for the 400.
For 2003 NHRA lowered our 400's horsepower by ten to 315 hp. That means
we get to weigh 93 pounds less in 2003. But they still have 55 more cubes and almost
a half inch more stroke plus round port heads.
Underdog King of the poor boys.