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taco |
13 years ago in FORD
Im restoring my late dads 74 f100.It originaly had a 360 in it that was just worn out @ the time,It was replaced with a crate 360 and didnt get driven much.After 6 years and 3 thousand miles it started smoking.This was replaced with a 391 from a f600.This motor runs well but vibrates @ idle speed.The 391 was a straight shift but mine is an automatic.Any ideas will be a big help~!Thanks.
Answers (6)
10 years ago
TRY CHECKING FOR VACUUM LEAKS.
10 years ago
The 360 and 391 are internally balanced at the factory. The 391 uses a much large pilot bushing than the 360 or passenger fe's. Since you are using an auto the pilot bushing is not used but the end of the crankshaft is not compatible with the hub on the convertor. A machine shop should be able to make a bushing to correct this. Check the flexplate for cracks since you've been running it.
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