Bolt specs

captndave737

Well-Known Member
Joined
Feb 14, 2006
Does anyone know the bolt specs for the bell housing to engine block? Are the bolts supposed to have washers on them? I'm pretty sure they were grade 5 but not sure.
I know they're 3/8-16 but what length? 1-1/4"? 1-1/2"?
 
Definitely no washer. Got to be 11/2. Grad 8 will have better bolt head matting surface,good quality grade 5 will too.
 
That's taken from the shop manual which I have but it doesn't list the grade or length of the bolts.
3/8-16 1.25" grade 5
according to illustrated manual was originally GM 9440954 phosphate finish .. but discontinued
 
Just found OEM bolt 1 3/8
 

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Thanks all. I had a mix of original and others. I have no idea how I lost some of the originals. I now have all grade 8- 1 1/2" installed.
 
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