What if? 4.3ish bore x 4" stroke
How do the characteristics of a 4.18ish x 4.21" or 4.25" stroke compare with a 4.3ish" bore x 4" stroke?
What if the 1970 455 had instead been a 4.255" bore x 4" stroke?
Quote:
Originally Posted by Steve C.
400 block bored .060" over
4.185" x 4.250" stroke/ 467 cubic inches
Unported KRE d-port heads / 85cc chambers
Edelbrock RPM intake / Q-jet carb
Crower 60919 hyd flat tappet cam with 1.65 rockers
Doug's headers, 3" Pypes system with X crossover running
through 18" Xlerator mufflers
Peak power at 5300 RPM
Dyno Sheet: https://pontiacstreetperformance.com...455MikeG2.html
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1970 Lucerne Blue Firebird Trans Am, deluxe blue interior. Original Ram Air III, M-21, 3.73. Being built as a 4" stroke "434" with SR 614 Ram Air IV heads
1972+ Lucerne Blue 4-door hardtop "what if" T-41 Le Mans Sport GT/Grand Am concepts. Equipped with future 3" journal "455 HO"/"what if" prototype "SD 455".
What if GM had continued production of the 1970-72 GM A body somewhere in the southern hemisphere?
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