bolt size / length / grade ?

[sweetk30]

my brain is fryed and i just need some info . . .

what bolt size / length / grade for these items ? figure 3/8 thread course just making sure on this .

engine to trans bell bolts
th400 to 203 adaptor grade only using custom spacer .

thanks guys . trying to get budget beater going. she is in the shop on the lift and parts are lining up on the install line.

 

[mrk5]

I can only guess on length but bell housing to engine bolts should be 3/8-16. I think length is 1.25"

 

[6872xtc]

I can't tell you for sure, but I think that I used 1.5" long bolts, because I used a hardened flat washer to keep from digging into the trans bell. I would say that grade 5 is probably fine, but I had grade 8, so....
And I don't remember if I used lock washers...


Edit: I was referring to the engine to bellhousing bolts.

 

[obijuank5]

Dont the 203 adapter bolts use a flanged head with an oring underneath?

I believe they are 1.25" flanged hex head.

 

[tenderfoot]

I just happened to pull a th350 last Sunday. And:

Bell housing