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rowdyboys31 · 03-27-2011, 02:10 AM

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

03-27-2011, 02:10 AM	#14
rowdyboys31 Junior Member Join Date: Dec 2008 Posts: 36 Likes: 0 Liked 0 Times in 0 Posts	Re: Buick 455 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