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crank & rods

2K views 10 replies 6 participants last post by  White Lightning 
#1 ·
steel truck crank 4.250 stroke std.mains and 2.1 rods.chromed.c/a 6.775 rods new.750$+shipping.:)
 

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#4 · (Edited)
Hopefully the OP doesn't mind if I comment here......

The combination is more oldschool than oddball, and a pretty sweet deal for a custom stroke forged crank. Displacement would be 514 with +.030. You could use this crank/rod combo with a piston that has a 1.42 compression hieght (which I know Diamond offers as an off-the-shelf/pre-engineered deal). Total stack would be 10.325, so a later block with a slightly thicker than normal head gasket would also be needed. You could also have the pin location altered on that piston for a minor upcharge if you needed to stick with 10.300.
 
#8 ·
Agree, no such thing as "oddball." It's simply not an offshore "cookie cutter" stroker kit. You can bore and stroke an engine however you wish. :)

To add to Carl's points: given the 3.59" stroke fo the forged 429 truck crankshafts, a 2.100" rod journal allows only up to 3.975" theoretical stroke without welding. In order to achieve 4.250" stroke, this crankshaft had to be welded on the rod journals, offset stroked to 4.250", and then chromed over (as noted in the original post). Not an uncommon practice back in the day.

Paul
 
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