292 cylinder head mystery bolt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pseigmund · 03-29-2009, 08:18 PM

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.

PanelDeland · 03-29-2009, 08:34 PM

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

pseigmund · 03-29-2009, 09:06 PM

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.

Willys47 · 03-29-2009, 09:16 PM

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

MXmaniac · 03-29-2009, 11:02 PM

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.

pseigmund · 03-30-2009, 08:00 AM

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.

**'68OrangeSunshine** · 03-31-2009, 06:08 AM

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

pseigmund · 03-31-2009, 08:40 AM

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.

Elephanthead · 03-31-2009, 09:25 AM

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.

Wrenchbender Ret · 03-31-2009, 06:07 PM

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

03-29-2009, 08:18 PM	#1
pseigmund Registered User Join Date: Feb 2009 Location: Whitefish, MT Posts: 27	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. Attached Images

03-29-2009, 08:34 PM	#2
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,993	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. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

03-29-2009, 09:06 PM	#3
pseigmund Registered User Join Date: Feb 2009 Location: Whitefish, MT Posts: 27	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.

03-29-2009, 09:16 PM	#4
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: 292 cylinder head mystery bolt I just looked at mine and it has a bolt there and thats it __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!!

03-29-2009, 11:02 PM	#5
MXmaniac Registered User Join Date: Jan 2007 Location: Denton, Texas Posts: 356	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. __________________ Andrew '69 C-20(292, 4-speed) Retired Daily Driver '64 C-10(250, 3-speed) Fixerupper '97 Frd Mustang GT(4.6L, 5-speed) Daily Driver If I only wanted two pedals I'd have bought a bicycle. Last edited by MXmaniac; 03-29-2009 at 11:08 PM.*

03-30-2009, 08:00 AM	#6
pseigmund Registered User Join Date: Feb 2009 Location: Whitefish, MT Posts: 27	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.

03-31-2009, 06:08 AM	#7
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 7,438	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. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 03-31-2009 at 06:08 AM.

03-31-2009, 08:40 AM	#8
pseigmund Registered User Join Date: Feb 2009 Location: Whitefish, MT Posts: 27	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.

03-31-2009, 09:25 AM	#9
Elephanthead Registered User Join Date: Nov 2008 Location: Carmel, IN Posts: 187	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.

03-31-2009, 06:07 PM	#10
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,228	Re: 292 cylinder head mystery bolt That is a boss for an engine handling bracket. No oil can come out of it.

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