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Are you using full groove main bearings or stock? If stock maybe you should use full groove instead What weight oil and what where you doing when it spun, cold , hot, driving at normal RPM or revving the motor up? Do you know how much actual (measured with micrometers and or dial bore gauge)clearance you had on the rod to crankshaft? Bearings spin for several different reasons
Let me see if I can answer all of your questions:
I've used nothing but full groove mains.
I run 9 qts of 15w 40 Rotilla T with 3 bottles of STP.
Driving normal when I started hearing the rap, but don't know when it actually spun. Oil pressure with the rap was at 65 and steady????
Actuall clearance on rod bearings was .0025", mains .0025" also.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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