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Oh Boy, here we go. What kind model of Olds and what engine is in it now? I have raced 350's/403's/425's/455's. NO OLDS ENGINE can live at 8500 RPM's. Now I will tell u what I know. I have bracket raced a 403 for 4 years. Engine is pretty mild, stock #5 heads are holding it back. 12:90's@105.85, 60's only 1:80's. Shift @5500, comes through @ 5150. A guy @ realoldspower has 850 runs on a 403 that goes 11:90's, shifts @ 6300 and through the traps @6500. I have seen more 455's spun bearings/rods through the block than the 403. I have never personally seen a 403 hurt yet. In my "main" race car I run a 425, I like them better than the 455. Whatever fits the best use. Put a big oil pan on it whichever engine u use. Ken
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