[LiL Jack]

Originally Posted by BruceWilkie

No he's off lol.

Our Pontiac motors have always been happiest with strokes under 4.25.. Our geometry for example puts less side loads on pistons aiding ring seal. The piston doesn't come as far out of the bore which is another advantage helping ring seal.
Then you can also take into consideration side load and point where peak piston speeds( not avg) occur. Piston dwell TDC/BDC also a factor. Yep them old 4" stroke "440" combos work great. A 4.255 bore 4" stroke would be a different 455 than we know lol.

So I will go faster with a 4.25 crank?

Langer,Dwight and Jeff too?

[BruceWilkie]

Originally Posted by LiL Jack

So I will go faster with a 4.25 crank?

Langer,Dwight and Jeff too?

Get some turbos and injection from Travis and use a 4" stroke then turn the RPM up. Might be better to use a 4.25 bore while you're at it.