I am building a 454 for my 71 Chevelle and I am going to buy a new crank. It is asking for a 4.000 or a 4.250 stroke. What is the difference and how do I find out which one is for my block. I have a 73 4 bold main block and it is a 289 block. Thanks for the help. JP
A 4.00in crank, as already mentioned, is the standard stroke for a 454.
For building a 496 from a 454 block, then the 4.25in crank is used. If you are building the engine from scratch, and the cranks are the same price, I'd go with the 4.25in crank and build the 496. Trust me, you will LIKE IT!
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