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I'm still fighting this dang noise in my motor. I have changed the rod bearings...the crank is still smooth but I did have some premature bearing wear. I guess that coolant that got into the oil did do some damage to the bearings. The engine has quieted down greatly since I 1-set my lifter preload and 2-installed the new rod bearings, but I still can hear something. I'm thinking it might be a wrist pin...I'll pull plug wires and see if it stops. ANYWAY my question is will I hurt the motor by running it if there is a wristpin making this noise? My father who is a good SBC mechanic says that cars can go 100k miles with this problem but he doesn't know what effect adding boost to this problem would cause. The noise isn't bad and it mostly on deceleration although there is a spot in the rpm band at about 2500rpm that you can hear it if you hold it there. Thanks in advance for your time guys. powersix