sbf 302/342 stroker build need help please???

DirtyII said:

ok so I have a fresh standard bore 302 with a 3.400 stroker crank. now i know with a 5.400 rod length it will make a 342 stroker with standard bore..my question is would it still be a 342 or what would the cid be using the 5.090 rod i already have instead of going and buying 5.400 rods and also would i have any issues using these rods with this crank versus the 5.400's ???

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rd said:

You have to match the rod length and piston to the stroke. If the rods are too short you will have no compression and the pistons will hit the crank at the bottom of the stroke. If the rods are too long, they will extend out of the cylinder at the top.

There are some variations in rod length for each given stroke, but the piston compression height (where the wrist pin hole is, vertically) has to match to get the piston top to the proper deck clearance, ie, the top of the cylinder bore.

The top of the piston should be about .002-005 in down in the cylinder at tdc. That is a good planning figure, the actual dist should be calculated and checked by the machine shop for your combo.

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