Clearancing for ARP Main Studs

[FASTBACK340]

This thread pops up from time to time and I promised pictures of my engine. When you use ARP main bearing studs there's a clearance issue with the oil pump housing and the back main stud. I had mentioned that my machinist back-cut the cap and shortened the stud. A 12 pt. nut helps with clearance too.

Here you can see where the left side stud area has been sliced. Considering how deep the rear main cap is that 3/16ths. of metal will be negligible.

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Remember, I just held the pump on for these pictures. There's no gasket, or clamping for that matter, to show the exact clearance between the stud and housing. It's tight.

 

[1966 dart wagon]

wow i had no idea of this issue, thanks for posting it up and how to get around it :thumbup:

 

[FASTBACK340]

And don't forget: If you use studs on the mains DEFINITELY align-bore the main bearings AFTER the studs are installed and torqued!