More important than clearances is oil volume. If you run a dry sump
system, you're fine. But if you run a wet sump, be sure to have at
least 12 quarts of oil or one of the newer blocks that have priority
oiling. I have not so good experience...........
On the subject of clearance, with lower viscosity oil, reduce bearing
clearances. And piston skirt clearances. Depending on how light the
oil is, 2 to 3 thou on the rods and 3 to 4 thou on the mains. At
least 50 psi oil pressure and even better, 10 psi for each hundred
HP. Doug Odom is a good source of info on engine lower ends.
It matters little the brand of engine....bearings are bearings.
Good luck,
Skip
At 07:40 PM 5/10/2010, John Burk wrote:
>BBC
>
>>John, 427 what? Chevy? Ford? If tiz chevy and a stroked small
>>block then excuse the ring, lol.... I know nothing about them ch*vy
>critters...
>>
>>mayf
>>John Burk wrote:
>>
>>>For a 427 stroke , 7500 rpm and the lighter oil everybody uses what sort of
>>>bearing clearance works at Bonneville .
>>>
>>>John Burk
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