Correct 1965 sb bellhousing bolts?

[Dick G.]

Can someone tell me what headmarks should be on the 6- 3/8-1 1/4" long bolts that attach the bellhousing to the engine bellhousing flange. I have from other cars, WB1C bolts, and bolts with an A with a circle around the A grade 5. This A bolt has a cast in flange in place of a washer. Any replies appreciated. Thanks Dick Gutman

[Joe L.]

Re: Correct 1965 sb bellhousing bolts?

Dick-----

The original bolts were a FLANGED head bolt; they did not use a seperate flatwasher. "A" was one of the headmarks. Likely, there were others used, too. All were GM 280M (SAE grade 5).