Thread: chevy 400

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If the crank you are using is a stock 400 gm crank that has just had the mains turned down, then your set up with the 400 rods will work fine.Eagle cranks as an example say 5.7 or longer because their counterweights are a little taller and will hit the skirt at BDC .a 400 piston has the same comp height as a 350 they just use the shorter rod to make up the diff in the increased stroke.we used to call these the poorboy 383. gm400 crank with the mains turned down, 400 rods and 350 pistons. these work ok but the 5.7 has a better rod ratio.less side thrust on the piston, less friction, more power,last longer. Jeff

thanks motorman and all of u

the crank is scat by summit it ask for 5.7 rods

Crank doesn't set the rod length, that's up to the builder. Pistons adjust pin heighth to accomodate what ever rod you can run.....put the thing together. Just double check everything as you assemble it. We all can't keep saying the same thing, you have to get it done.

ok thanks u all