View single post by Jensen Healey
 Posted: 11-08-2014 03:29 am
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Jensen Healey

Joined: 03-11-2005
Location: San Anselmo, California USA
Posts: 983
It's starting to look like the main bearings. As the block warms up and expands, the bearing tolerance widens.

What oil are you running? Hopefully a 20-50 with ZDDP like Valvoline Racing.

You could try some Lucas heavy duty oil stabilizer to see if it changes or eliminates the noise. If so, the mains need replacing.