1966 A/C Muffler bolt length?

[Robert W.]

I know the correct bolt is a GM 120677, but does anyone know the length of that bolt? I have a 3/8-24 1-1/4" bolt with a TR head that is too short to engage the compressor threads if the proper thick washer (3706737) is used. Without the thick washer, I get about 1/4" thread engagement so operationally, it's fine, but not "correct." The bolt "kits" don't use the correct washer and seem to use the 1-1/4" bolt...

[Gary B.]

[Robert W.]

Re: 1966 A/C Muffler bolt length?

Thanks Gary, I checked and my current bolt was from Paragon. LIC is an std overnight shipment to me in MA so I'll give them a try.

[Alan D.]

Re: 1966 A/C Muffler bolt length?

120677 Hex hd 3/8-24 X 1 1/2

[Robert W.]

Re: 1966 A/C Muffler bolt length?

LIC Bolt is also 1-1/4" long! They supply a thinner "thick" washer, but the engagement still can't be more than 3-4 threads. Any ides where to find a 3/8-24 1-1/2" TR or 1966 appropriate headmark bolt?

[Gary B.]

richp6372@gmail.com

Gaty

[Robert W.]

Re: 1966 A/C Muffler bolt length?

Thanks Gary, I just emailed him. At this point cheap isn't really the goal!