I am guessing you are asking whether the head end is a hex or slotted  screw style.  If I am reading my parts book correctly the pan attaching bolts are of a round slotted head style 1/4"-20x/1/2".

Hi Steve

Steve is correct.

The screws should be 1/4-20 slotted pan heads.

The extensive use of them on early six cylinder Chevrolets is what let to the engines being called "stovebolt sixes".  🙂

Thank you.  Are there still 5/16 bolts at the rear seal?

I'm not sure about that for 1936.

I know the "corner" bolts are 5/16 on my '46 and if I remember right they are hex heads.

PS

I may be wrong on the hex heads.

If I remember, I'll crawl under the truck tomorrow and look.

@steven-cavagnolo 

Actually...

If I'm reading the parts book right, the 5/16 screw/bolt at the corners wasn't added until 1942.

And, 1940 was when they began making the star lock washer an integral part of the screw (as it is on my '46).

@steven-cavagnolo 

Just looked under my '46...

The four "corner bolts" are 5/16 with hex heads (but can't say if they were that way 78 years ago 🙂).

All of the others are the 1/4-20 slotted pan heads with the integral star lock washers, including the fasteners on the side cover.

Hope that helps.

Ole, My understanding is that a "stovebolt" is a round head slotted machine screw. A panhead screw has a flattened head. Of course, things might be different in the Frozen North.

Mike

@35mike 

I agree.  👍

Stove bolts were more of a rounded head up here too.

Been a while since I've done anything with my '29, but I think they actually were more of a rounded head, like traditional stove bolts.

At some point Chev started using the flatter head... possibly when they added the integral star lock washer?

I suspect that may have been in 1940, as the parts book first lists a "Bolt, Oil Pan Attaching, w/Lockwasher" for 1940-54 under group number 1.428, but nothing before that.

I was hoping you'd join this thread... and I humbly defer to you on exactly what the screws would have looked like in 1936.  🙂