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Now my potential customer has seen the ARP main studs I used in my Packard truck engine and wants them in his, too. I'll have to do a mock-up and see if there is any way to use your adapter with main studs. What do you think?
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Yes, it should work. On the current adapter, the main bolt heads are relief clearanced, but there is no reason why that could not go all the way through <b>ON THE D-SIDE</b> to allow for a main stud to stick through. <b>ON THE P-SIDE</b> you will have to increase the clearance relief and cut off the main stud slightly below the adapter top plane, but there should be plenty of room above the nut and washer. Note that the current adapter is not as wide as this prototype.
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<img src="http://www.1956packardpanther.com/OHVOPA_AdapterCapSide.jpg">
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<img src="http://www.1956packardpanther.com/OHVOPA_PumpBoltedToCap.jpg">
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So long as the main studs are not too long, there should not be any interference with the oil pump either.
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<p>
The adapter itself bolts to the original oil pump holes in the main cap.
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<p>
Craig
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