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#6
10-06-2003, 01:28 PM
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Re: 291 heads on L S 6's ?
You don't have to take off the oil pan to see if it has 2 or 4 bolt mains.Look at the area above the oil filter.
Look for two enlarged threaded outlets,to accept an external oil cooler.That would be a 4-bolt main block. 
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