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.030 390 FE build for Street 68 Mercury Comet Cyclone.

50K views 450 replies 33 participants last post by  BBF612 
#1 ·
The block is out of a old dump truck and just got out of the sauce, I think it's a 3.875" bore block.

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#2 ·
The block is out of a old dump truck and just got out of the sauce, I think it's a 3.875" bore block.
What cubic inches was that engine? I don't ever remember an FE with that bore size. 390 should be 4.05" bore

Stan
 
#5 ·
Four bolt motor mount block out of the late sixties. Possibly a 352 with a 4" bore. Or a 390.
Medium duty stuff like a 361 or 391 would have the double webs in the mains, which this block does not have.
 
#23 ·
The first picture is of a cast 390 crank and a cast 68 427 crank, both have the same stroke, Jim is using the cast 390 crank for this build along with the 428CJ type rods in the pictures in the above post. The next crank is steel out of the dump truck engine. The third picture is of what I think is a 428 block that Jim sonic tested.

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