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Old 02-11-2009, 10:16 AM
CNC-Dude CNC-Dude is offline
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Only the bore and stroke determine the cubic inch of an engine! Not saying you shouldn't use the stock length rods in your build-up, but typically, most 4.250 cranks have a lot more couterweight structure added to them to aid in the balancing of the added stroke. The shorter rods will require you to remove most of what was added, and in doing so will require you to add back about $600 dollars worth of Mallory metal to bring the rotating assembly into balance. Generally, these crankshafts have their counterweights cut for specific rod lengths, so if its still new,as you say it is, then you should try to find any paperwork or contact the manufacturer, to get their recommendations on what rod lengths they made the crank for....especially before you buy some aftermarket pieces that might not be able to be returned.
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