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Old 08-15-2004, 11:12 PM
whd507 whd507 is offline
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391 truck engine

can anybody confirm that a 1974 391 has only 7.4 to 1 compression?
will 390 pistons raise compression? or should I just get FE heads/intake?

the 391 runs like a swiss clock, but while adequate power is there, I want more...




also, anybody know the compression ratio and HP of a 1979 370 2v? 4v?

does it use the same timing chain setup as a 429/460? I was thinking of advancing the cam timing that way.

I just replaced the OEM duraspark, as it was speed limited, with a petronics setup, that alone feels like 20 hp. (plus its way faster)

it runs pretty good, but I will have to find a 68-71 4v intake and install an edelbrock carb. (I'm afraid to mount the HD thermostat housing on an aluminum intake)

also,my second 1979 F-600 has an eaton 2-sp axle in it, code F2M, and a trans code of 2A. I'm pretty sure that the trans is an OD unit (clark)but I'm not sure.

anybody have a shop manual that would tell me the axle gear ratio?
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1994 Bronco, 1996 Bronco, 1996 F-250 Powerstroke Supercab 4x4, 1979 F-600 Crewcab,1976 F-250CS, 2003 Mercury Marauder and assorted other boring vehicles...
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