David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

Chrysler advertised compression ratios for the 318 engines.

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1989 - 1991 318 roller engines were also 9.2:1 cr with flat top pistons without the valve reliefs.

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1990 9.2:1 cr 318 roller engine.
Flat top pistons, no valve reliefs.