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Old 11-08-2012, 01:12 PM   #1 (permalink)
spdrcr137's Avatar
Join Date: Nov 2012
Location: Illinios
Posts: 514
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Cam plate bolt upgrade

Im sure somewhere in here this has been covered but i felt it was a good enough topic to post again if it had.

As most wrenches that have changed cams on a twin cam know the 1 and 2 bolt holes in the cam plate are easily stripped when torquing the bolts anywhere near the specs. I found during my research before replacing cams that a simple and great fix before you mess up the bolt holes is to put studs in the spots with 12 point nuts.

Dorman part number 675-086 is a 1/4 20 stud with a 1/4 24 thread for the nut. I picked up two at the local parts store. I did have a lot of trouble finding the small twelve point and I found that summit sells a set of 1/4 24 ARP 12 point nuts that fits the job perfectly. This was so much easier and cleaner than repairing a couple stripped holes in a cam chest.

ARP 300-8330

This was an easy upgrade for around $20 and in my opinion just another item the MOCO should have already taken care of.
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Old 11-11-2012, 09:02 AM   #2 (permalink)
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Join Date: Feb 2003
Location: Michigan
Posts: 181
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90281A095 10 Each Black-oxide Steel Spacing Stud, 1/4"-20 Sz, 1-1/2"l O'all,1/2" & 1/2" Thrd Lengths $1.65

90759A100 10 Each Chrome-moly Alloy Steel 12-point Flange Nut, Black-oxide, 1/4"-20 Thread Size $1.72

McMaster Carr has them also
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