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Old 04-06-2007, 12:11 AM
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Crank questions

a few questions

running a 350 .060 over

normally this would be 361 if i added correctly

the crank is a 350 crank with the rod mains cut down to small journal size(2in versus 2.1 in)

what displacement does this give?

also is a 350 crank with small journal sized rods a reliable circle track setup or should i ditch this in favor of a trad 350 crank

questions stem from the crank being bad and needing to get a new one

also any rough estimates as to cost to get a 350 crank cut down on the rods to this size?

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Old 04-06-2007, 01:27 AM
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Stock Chevrolet small journal vs. large journal rods are both 5.7" lenth rods c/c. The only advantages to using the small journal rods on a cut down large journal crank would be: to save a used up large journal crank that had bad rod journals, lower rotating mass, less friction. The disadvantage would be that the small journal rods would be weaker, and the rotating assembly would need to be rebalanced. At one time this was a fairly common practice but you don't hear much about it much anymore with the aftermarket connecting rods available now. It's sort of gone the way of "3/4 and full race cams". To answer your question on the C.I.D., it's not going to change anything there as the small and large journal rods are the same lenth and the crankshaft stroke has'nt changed (rod lenth does'nt matter there anyway); given the pistons ( pin height ) are the same. Now, some cranks can be "offset" ground to make them "stroker" cranks and they wind up using small journal rods to accomplish this. Maybe this is what was done with your engine.
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