Quote:
Originally Posted by rowdyboys31
Mike, I spin my motor in the 6100+ range with a 4.30 gear. I know when I changed from the 4.10 (5600-5800) to a 4.30 the first thing that failed were rocker arm shafts. I run the TA thick wall rocker arm shaft now. If I were you I'd start with a 4.10 gear, my motor never broke one stock RA shaft in the 5600-5800rpm. Mike I've never had a main bearing fail, I think as long as you get good machine work done i.e. line hone, crank grind and clevite bearings your motor will live a long happy life. Good Luck, JKeihn 3954 maybe I'll see you at the Norwalk LODRS
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Why can't you turn the engines any faster than 6,100 rpm? Are the heads and intake that bad?