What's the bolt size for the transmission flywheel cover?

[Jayschevy]

I have a 71 truck with a 350 engine and TH350 turbo transmission. When I purchased the truck it didn't have a cover over the flywheel. I recently purchased a cover. However, I need to know what size bolt I'll need to use to attach it to the transmission. Does anybody know what size bolt I'll need to use before I have to go and buy a bunch of various bolts I don't need?
Any help would be appreciated.

[TBONE1964]

If you have a 1971 350 transmission, it should be a 1/4 x 20 The later 350 trans missions used a metric and some were a self tapping style screw.

Here is what you can try:

Remove one of your valve cover bolts and try threading it in the hole on the trans, if it threads in, then you have a 1/4 x 20 bolt. The length should be around 1/2 to 3/4 inch.

This might save you some unneeded inventory of bolts.

[Jayschevy]

Originally Posted by TBONE1964

If you have a 1971 350 transmission, it should be a 1/4 x 20 The later 350 trans missions used a metric and some were a self tapping style screw.

Here is what you can try:

Remove one of your valve cover bolts and try threading it in the hole on the trans, if it threads in, then you have a 1/4 x 20 bolt. The length should be around 1/2 to 3/4 inch.

This might save you some unneeded inventory of bolts.

Thanks, I will try the 1/4-20 bolts today after work.....