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Old 11-09-2012, 07:49 PM
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Originally Posted by Rick0087 View Post
so the machinist has verified it is a cast crank so it looks like i am buying one from him. grrrr heres a question for you guys that he mentioned to me about making a 302 is the pistons height is like 1.8 and a 350 piston height is 1.5 so couldn't I just use a 350 piston 5.7 on a 6" rod to make up the difference? so the piston height would be back up to stock 1.8???
The 350 piston has a compression height (CH) of 1.56" stock or 1.54" if they're "rebuilder" pistons.

So the stack would look like:

deck height (9.025" to 9.00") minus 1/2 stroke (1.5") minus rod (6") = 1.525" CH, or 1.50" CH if zero deck (9.00") block.

Using a rebuilder piston this puts the top of the piston out of the cylinder at TDC by 0.015" if the block is uncut, or 0.035" using stock CH piston.

Using a zero deck block, the 1.54" piston is 0.040" out; 0.060" out if using stock CH pistons.
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