Quote:
Originally Posted by olddog
The 390 has the same stroke as the 427.
The 391 truck has a larger OD on the snout (where the damper goes) and will need turned down. The huge advantage is that these are steel cranks -not cast iron. Now I cannot remember for certain if all 391FT are steel, but most are, if not all.
Unless you have some rules preventing you, why not stroke it out? Cost about the same for a whole rotating assembly either way.
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Just for the record, 390 cranks are cast steel, not cast iron. The later 427 cranks were of course forged steel.
No one would doubt the benefits of building an engine with a forged steel crankshaft. But for a street engine, I don't think they're worth the extra $$$. I've never heard of someone with a broken FE crank on a street engine.