Jocko_51_B3B Posted July 16, 2023 Report Posted July 16, 2023 My '51 B3B engine seems to be running pretty well. I have right around 115 PSI dry compression pressure and 120 psi wet with only 2 or 3 psi variation between cylinders, but I want to check engine timing, manifold vacuum, dwell, and valve tappet clearances. I assume the engine should be at a specific idle RPM when doing these checks. Is there an idle RPM spec for Mopar flatheads when making these checks and adjustments? I would guess around 500 RPM but I'm just not sure. I don't see a spec in the service manual. Quote
Plymouthy Adams Posted July 16, 2023 Report Posted July 16, 2023 specs is listed in the IGNITION section of the manual, dwell is expressed in cam degrees, timing is note near bottom. Vacuum and mechanical advance also listed. Did not see the RPM but Motors have some as low as 475, find your happy place. 1 Quote
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