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GMC V6 and V12 Engines Engine repair and rebuilding

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  #21  
Old April 24th, 2020, 12:01 AM
jagarra jagarra is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

this outfit lists pivot studs, they may have that will work.

https://pitstopusa.com/c-132367-driv...all-studs.html
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  #22  
Old April 24th, 2020, 01:55 PM
Pursellauto Pursellauto is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Thank you for the link. I was actually able to come up with a GM part number that fits a whole slew of years and models. 3866568. Found a dealer in Macomb Illinois that had it and should arrive today.
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  #23  
Old April 29th, 2020, 05:21 PM
Pursellauto Pursellauto is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Quote:
Originally Posted by Pursellauto View Post
Thank you for the link. I was actually able to come up with a GM part number that fits a whole slew of years and models. 3866568. Found a dealer in Macomb Illinois that had it and should arrive today.

Got the clutch pivot stud from GM. We got the broken threaded portion out of the bellhousing and this fit perfectly.
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File Type: jpg PIVOT STUD.jpg (92.4 KB, Multiple views, 2 clicks)
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  #24  
Old May 1st, 2020, 08:56 PM
Pursellauto Pursellauto is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Here is a major difference in the block of the 305 and the 351. The 305 has a stud in the block on the right side near the timing cover that the motor mount bracket fastens to. The 351 has a pipe thread fitting in a hole in the same location.
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File Type: jpg 305 BLOCK.jpg (141.8 KB, Multiple views, 5 clicks)
File Type: jpg 351 BLOCK.jpg (117.9 KB, Multiple views, 6 clicks)
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  #25  
Old May 2nd, 2020, 09:24 AM
BobBray BobBray is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

As you probably know the 351C is a medium/heavy truck engine and was not used in pickups. I believe the pipe thread hole in the block was for a hose nipple for the oil return line from the air brake compressor. Large trucks had different front motor mounts than pickups too, so there was no interference with the oil return line. If the pipe thread hole is on the same center as the 305 engine mount hole, maybe you could drill and tap a pipe plug for the engine mount bolt if it's large enough or weld a stud on a pipe plug and use a nut to hold the engine mount.
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  #26  
Old May 2nd, 2020, 01:54 PM
GMCv6inND GMCv6inND is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

I’ve done this exact swap over in my 67 pickup, I don’t exactly remember what I did, but after looking at it just now and the other two engines I have in my shop (original 305 and truck 351c) - I have a plug, a stud and a bolt so must have just swapped over?! Of course, swapped oil pan, oil pump, oil filter housing, and clutch, since they were larger as well as swapping the timing cover housing to get the fan in correct location - just put all the pickup parts back on the truck engine. As for the carb, I swapped over to the Holley and luckily I had the power steering, so that and the motor mounts all swapped over fine. Can’t think of much else. Good luck
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  #27  
Old May 2nd, 2020, 02:42 PM
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sclor sclor is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Pursellauto:
I recall using a flush 1/2" brass plug that I got from a hardware store. The motor mount bracket then went over the flush plug. Doesn't look like I had any problem with the stud lining up, however. See attached. My engine is a 351e with magnum heads.
Regards Steve
New Orleans
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  #28  
Old May 2nd, 2020, 04:38 PM
bigblockv6 bigblockv6 is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Quote:
Originally Posted by Pursellauto View Post
Here is a major difference in the block of the 305 and the 351. The 305 has a stud in the block on the right side near the timing cover that the motor mount bracket fastens to. The 351 has a pipe thread fitting in a hole in the same location.
In a situation like this when installing a bigger truck V6 into a pickup truck I'll drill a hole in the plug, tap it and install a threaded stud..
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  #29  
Old May 2nd, 2020, 04:41 PM
bigblockv6 bigblockv6 is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Quote:
Originally Posted by Pursellauto View Post
Here is a major difference in the block of the 305 and the 351. The 305 has a stud in the block on the right side near the timing cover that the motor mount bracket fastens to. The 351 has a pipe thread fitting in a hole in the same location.
The 305C will also have a threaded plug, it's not so much the difference between displacement size but what application the engine is for, I have a 351E with the stud on the side of the block.
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  #30  
Old May 3rd, 2020, 02:14 AM
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LEWISMATKIN LEWISMATKIN is offline
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Default Re: Engine swap on 65 GMC 2500 305 V6

Pursellauto, this is Lewis Matkin. Both carbs are WW Stromburg carberators. All you have to do is to remove the Hoof Goveneror and the long studs, replacing them with the shorter studs of the 305. The main differences between the 305 and 351 carberators is the main jets and the power valve. the 305 has 0.55" main jets, and the power valve is either .62" or .65". The 351 is larger jets & power valve. Just use the 351 carberator.
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Last edited by LEWISMATKIN; May 3rd, 2020 at 02:16 AM. Reason: miss spelling
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