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Old 10-29-2025, 10:26 AM
unruhjonny's Avatar
unruhjonny unruhjonny is offline
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Join Date: May 2004
Location: Calgary, AB, Canada
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I just want to punctuate one part of Giles' post:

Quote:
Originally Posted by giles View Post
... I’ll assume you have 8:1 compression ...
Be sure to not lower compression;
Those multi-relief pistons won't help you, and try to pay attention to piston height to ensure you don't unintentionally lower compression.

If my memory serves me, your engine was rated at 8.3:1 or 8.4:1 - I would do what ever I could to ensure you don't go less than that.

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1970 Formula 400
Carousel Red paint on Black standard interior
A no-engine, no-transmission, no-wheel option car.
Quite likely one of few '70 Muncie three speed Formula 400's left.


1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing)
2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs)