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| | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | So I cane across a 261 block numbers 3769717 so that makes it 60 to 62 I believe. The head is 3836848 and that's where I'm puzzled. Isn't that head for a 235 motor?I thought that the 261 head was 3836850please someone School me. | | | | | Joined: Apr 2010 Posts: 114 Shop Shark | | Shop Shark Joined: Apr 2010 Posts: 114 | The 848 is a 235 head. Someone already helped you out. Hopefully they drilled the steam holes the 261 block has | | | | | Joined: Dec 2001 Posts: 14,522 Moderator: Welcome Centre, Southern Bolters, Legion Hall | | Moderator: Welcome Centre, Southern Bolters, Legion Hall Joined: Dec 2001 Posts: 14,522 | Yep, also have an "848" head on my 261. I did have to get the "steam holes" drilled. Machine shop guy charged either $25.
If I remember correctly drill them at 12 degree angle to be sure the holes come out completely in the water passage. I think Deve has some pics on his links.
The 848 is a better compression head as I understand it. And its hard to find some of the others, even 848's, that aren't cracked. | | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | The guy I'm getting it from pulled it from his truck to put a v8 it's a running motor with no problems. | | | | | Joined: May 2001 Posts: 1,904 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,904 | Still might want to magnaflux the 848.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
| | | | | Joined: May 2001 Posts: 1,904 'Bolter | | 'Bolter Joined: May 2001 Posts: 1,904 | Still might want to magnaflux the 848.
1948 3/4-Ton 5-Window Flatbed Chevrolet 34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.
| | | | | Joined: Jun 2012 Posts: 142 Shop Shark | | Shop Shark Joined: Jun 2012 Posts: 142 | Yeah we thinking the same thing. | | | | | Joined: Dec 2010 Posts: 97 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 97 | I know you aren't close to the Canadian border, but most of the 261s that I see from Canadian Pontiac cars seem to have the 848 head. | | | | | Joined: Mar 2005 Posts: 1,513 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,513 | The "inventor" of the idea to drill the six steam holes in the 3836848 head and place it on top of a 261 block is none other than General Motors of Canada Limited. Interestingly this engine made the same power with a single carb/exhaust as the Corvette 235.
1952 1300 Canadian 1/2 ton restomod You Tube | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Curt,
Thanks for that information.
Did GM of Can Ltd publish a technical service bulletin regarding using an "848" head?
Was the "848" head standard equipment in some years?
Thanks,
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