292 cylinder head mystery bolt
 

Hi All,

Does anyone know what goes in the bolt hole at the very rear of the cylinder head of a 292 (off a 1970, 3/4 ton). When I recently put the motor back in the truck, I thought it was for a bracket and left it alone (no bolt in it or anything). I have been trying to get my truck running and it started dumping some engine oil from the back of the value cover. I was wondering if it could have been coming from this bolt hole. In the attached pic, I put a bolt in it with some lock washers.

Thanks for any help.

Re: 292 cylinder head mystery bolt
 

Not sure on a 292 but IIRC that's where the oil pressure guage hooks up on my 250.

Re: 292 cylinder head mystery bolt
 

Thanks for the reply. The oil pressure gauge bolts in lower down on the block, passanger's side on the motor I have. The bolt in the back of the block is 3/8 or 7/16 in diameter so it is about the same size as the head bolts.

Re: 292 cylinder head mystery bolt
 

I just looked at mine and it has a bolt there and thats it

Re: 292 cylinder head mystery bolt
 

Could it be for a temperature bulb? My '69 292 doesn't have it, and I know the head bolts need to be sealed because they penetrate the waterjacket.

http://img11.imageshack.us/img11/1263/285j.jpg

Re: 292 cylinder head mystery bolt
 

Thanks for the info. and the pic. I guess I will just leave the bolt in it for now. Good looking re-build on the 292. I see you put a clutch kit in. I got one for my truck from northern auto parts (disc, release bearing, pilot bushing, pressure plate, install tool) for about $80. It is a great place to buy re-build kits as well.

Re: 292 cylinder head mystery bolt
 

Santucci's "Chevy Inline Six-Cylinder Power Manual" calls it a 3/8-16 UNC << Head Rear Accessory >> hole. Page 23.

Re: 292 cylinder head mystery bolt
 

Thanks for the information. Do you think engine oil could have come out of it since I didn't have a bolt in it?

Your 292 is incredible.

Re: 292 cylinder head mystery bolt
 

My 292 has a bracket there so you can yank the engine or head without having to climb in the truck and putting a bolt in there. I don't know if that bracket is original or left from a lazy installer.

Re: 292 cylinder head mystery bolt
 

That is a boss for an engine handling bracket. No oil can come out of it.