What is the correct size bolt for "35 engine pan

[v8nut]

The rebuilder of my 1935 engine used 1" long bolts on the engine oil pan. They bottomed out before they were fully tight and I have been chasing oil leaks for a couple of years before figuring out what the cause was. Should they be 3/4 inch 5/16x16 tpi or what? Are there any sources of the correct non marked bolts? Thanks for your help. Jim in San Jose

 

[DavidG]

5/16-18 x 3/4" except for one 5/16-18 x 1" bolt at the rear where the threades are in the pan, not in the cylinder block.

 

[cas3]

Thats a shame that the rebuilder was not sharp enough to use the original ford bolts.
They have a thicker head, and are of better quality steel than what you can buy today

 

[TerryOH]

You can get a kit of the proper bolts from Third Gen Auto in Tenn check their web site.

 

[rockfla]

Try Michael at Third Gen for the correct bolts both in finish and length

 

[marko39]

5/16-18 x 3/4" except for one 5/16-18 x 1" bolt at the rear where the threades are in the pan, not in the cylinder block.

I found a longer bolt installed where the starter bracket is, makes sense to me.