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Get rid of the 4:88 gears. Olds 455 will not rev like a Chevy. I would stay at 4:10 or 3:73. Hopefully you have a 7 or 8 Qt oil pan on the 455. Unless you know if the oiling system has been modifided and it at least has ARP rod bolts, I would keep RPM's under 5700/5800 range. These engines have LARGE main bearing and need a lot of oil the the crank plus heavy pistons so keep the RPM's DOWN as I said. Because of the long stroke, the piston speed at 5700 RPM's is probably the same as 7000 RPM' in a Chevy. Till you know more and what has been done to that engine be careful, Ken
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