David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting
Chrysler advertised compression ratios for the 318 engines.
1989 - 1991 318 roller engines were also 9.2:1 cr with flat top pistons without the valve reliefs.
1990 9.2:1 cr 318 roller engine.
Flat top pistons, no valve reliefs.