Ford Truck Enthusiasts Forums - View Single Post - 391 truck engine
View Single Post
Old 08-15-2004, 11:12 PM
whd507 whd507 is offline
Posting Guru
Join Date: Jun 1999
Location: SW Missouri
Posts: 1,172
whd507 is starting off with a positive reputation.
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?
Reply With Quote