Transmission Bell housing to Engine bolts - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pvienneau · 03-09-2014, 09:35 AM

Hello all, I was able to get the stove bolt engine of my 51 AD into the frame yesterday but some of the trans BH to engine bolts (i used new #5 bolts) seemed to spin and not tighten. I was wondering if this means the holes in the engine need work of if I should be using a different bolt.

Thanks

Patrick

**mr48chev** · 03-09-2014, 04:13 PM

I went out and checked the bellhousing that I have out of my 51 truck and it should take 6 each 7/16 NC X 1-1/2 bolts with lock washers on them and possibly 1-1/4 inch long measuring just the shank of the bolt and not the head.

The two smaller holes are for the dowel pins on the back of the block

Here is a shot of a 1-1/2 inch long 7/16 bolt that I put through from the inside with a lock washer on it. It may stick out just a bit too far though and possibly could bottom out in the block.

That is a fine thread bolt and the only one I had handy for show and tell.

By the way, as I have no clue as to how well you know bolt sizes you should be using a 5/8 wrench on the heads of the bolts you put in as normal 7/16 bolts take a 5/8 wrench. If you are perhaps using a 9/16 wrench you have 3/8 bolts which would be too small

**mr48chev** · 03-09-2014, 04:26 PM

Side note: you might want to take a phillips secew driver or small diameter bolt and check and see how deep the holes in the block are. Make sure you have enough depth in the holes in the block for the length of bolts you use so you don't bottom the bolts out.

Highsider · 03-09-2014, 05:09 PM

mr48 is a great resource!

pvienneau · 03-10-2014, 09:34 AM

Thank you again Mr 48. You definitely have the answers. I will double check the thread size and length of the bolts and make the correction.

Pat

03-09-2014, 09:35 AM	#1
pvienneau Registered User Join Date: Aug 2011 Location: Boston, MA Posts: 695	Transmission Bell housing to Engine bolts Hello all, I was able to get the stove bolt engine of my 51 AD into the frame yesterday but some of the trans BH to engine bolts (i used new #5 bolts) seemed to spin and not tighten. I was wondering if this means the holes in the engine need work of if I should be using a different bolt. Thanks Patrick __________________ Pat 1949 unmolested Indy Farm Deluxe AD 1949 Standard 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=581544

03-09-2014, 04:13 PM	#2
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,705	Re: Transmission Bell housing to Engine bolts I went out and checked the bellhousing that I have out of my 51 truck and it should take 6 each 7/16 NC X 1-1/2 bolts with lock washers on them and possibly 1-1/4 inch long measuring just the shank of the bolt and not the head. The two smaller holes are for the dowel pins on the back of the block Here is a shot of a 1-1/2 inch long 7/16 bolt that I put through from the inside with a lock washer on it. It may stick out just a bit too far though and possibly could bottom out in the block. That is a fine thread bolt and the only one I had handy for show and tell. By the way, as I have no clue as to how well you know bolt sizes you should be using a 5/8 wrench on the heads of the bolts you put in as normal 7/16 bolts take a 5/8 wrench. If you are perhaps using a 9/16 wrench you have 3/8 bolts which would be too small __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around. Last edited by mr48chev; 03-09-2014 at 04:23 PM.

03-09-2014, 04:26 PM	#3
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,705	Re: Transmission Bell housing to Engine bolts Side note: you might want to take a phillips secew driver or small diameter bolt and check and see how deep the holes in the block are. Make sure you have enough depth in the holes in the block for the length of bolts you use so you don't bottom the bolts out. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.

03-09-2014, 05:09 PM	#4
Highsider Registered User Join Date: Jun 2012 Location: Southern Iowa Posts: 944	Re: Transmission Bell housing to Engine bolts mr48 is a great resource! __________________ Jimi J from I-Oh-Way '57 Panel 3105 Met this deer... Roof Swap on my Panel Jim's Bread Truck

03-10-2014, 09:34 AM	#5
pvienneau Registered User Join Date: Aug 2011 Location: Boston, MA Posts: 695	Re: Transmission Bell housing to Engine bolts Thank you again Mr 48. You definitely have the answers. I will double check the thread size and length of the bolts and make the correction. Pat __________________ Pat 1949 unmolested Indy Farm Deluxe AD 1949 Standard 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=581544



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