taylor76zharris Posted June 16, 2013 Share Posted June 16, 2013 Alright ive been reading up on converting an f54, p90 head motor to a carb set up. Im unsure the differences in heads. I have read that the p79, p90, and p90a heads have the same valve size, combustion chambers, and intake runners. The exhaust ports differ from the p79 ( they have diamond shaped inserted exhaust runners) head to the p90, p90a. Is this true? Im wondering because i have read the p90 and p90a heads have larger combustion chamber because they were designed for the turbo motor. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted June 16, 2013 Share Posted June 16, 2013 The steel liners are round. The p79 and p90 have mechanical lifters. Other than lifters and exhaust liners the three heads are the same. Quote Link to comment Share on other sites More sharing options...
taylor76zharris Posted June 16, 2013 Author Share Posted June 16, 2013 Okay thats what i thought Quote Link to comment Share on other sites More sharing options...
Mack Posted June 23, 2013 Share Posted June 23, 2013 The difference in compression between turbo (P90 and P90a heads) and non turbo (P79) motors is due to the pistons. P79 headed motors have flat tops. Turbo motots as well as N/A engines that came with N series heads (N42 and N47) have dished pistons. . Quote Link to comment Share on other sites More sharing options...
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