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We Used a large Journal Three piece Crank I do not like the one piece i have broken a few of them in hot motors ,I find three piece is far more forgiving at high RPM and is able to flex and not break up so easy as the one piece ,We Machined the crank down to .9995" on the timming side main and are fitting an MMRJN1 Roller to that side,
Then a spacer will be Added to the main shaft to make up the difference,between the original small journal crank and the later one we are fitting,the small journal crank is pulled up on the drive side main,
not the timming side as on the later cranks.
 

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couple of questions..
you are using a pre unit crank? why don't you put a unit crank in there?
those rods are cool, how much do they cost?
 

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165 Posts
couple of questions..
you are using a pre unit crank? why don't you put a unit crank in there?
those rods are cool, how much do they cost?
I have Broken a few unit cranks in hot motors,they do not lke to flex at high revs like te old three piece they break across the top of the Web throught the slude trap hole usually on the timing side ,the three piece can whip and rev a bit higher .
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