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Old 03-25-2011, 12:55 AM   #1
JohnnyBoy350
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'66 GMC: 250 I6 to 350 V8...?

I want to yank my 250 and swap in a 350. Questions:

As you know this truck has the starter mounted to the bellhousing instead of the block, I will need a V8 bellhousing mount starter right? The six banger one is the wrong tooth count?

Clutch linkage attaches to bracket attached with two bolts to side of block(I6). Is there a bracket for the 350 or do I need a different linkage setup?

Any other insight or advice? Info? I just want to run my old tranny and stuff, just swap out the engine for now.

Thanks guys- John
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Old 03-25-2011, 02:23 AM   #2
padresag
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Re: '66 GMC: 250 I6 to 350 V8...?

you can use everything on the 250 from the flywheel back on the 350 inc starter. you will need a ball stud for the z-bar(clutch linkage) as the i6 one will not work
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Old 03-25-2011, 10:20 AM   #3
MikeN
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Re: '66 GMC: 250 I6 to 350 V8...?

As stated above, use your 6-cyl flywheel, clutch, pressure plate, bellhousing, and starter.
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Old 03-25-2011, 12:21 PM   #4
JohnnyBoy350
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Re: '66 GMC: 250 I6 to 350 V8...?

Wow, I didn't realize that the flywheel was interchangeable. Cool, so thats figured out. Anyone know about the clutch linkage?

Thanks- John
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Old 03-25-2011, 12:35 PM   #5
padresag
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Re: '66 GMC: 250 I6 to 350 V8...?

what did I say above?
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Old 03-25-2011, 12:40 PM   #6
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Re: '66 GMC: 250 I6 to 350 V8...?

1 vote for keeping your inline! V8's are boooring
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Old 03-25-2011, 01:00 PM   #7
JohnnyBoy350
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Re: '66 GMC: 250 I6 to 350 V8...?

Hahaha seriously I have no idea how I missed that, I must have been tired lol. Sorry about that, I'm usually more "on it" than that lol.

Ok, off to the junkyard to find a ball socket for a V8...

I thought briefly about keeping the 250, but I love V8's...sound, power, ect.

Thanks again- John
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Old 03-25-2011, 01:03 PM   #8
NCD1966
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Re: '66 GMC: 250 I6 to 350 V8...?

if you cant find a ball socket; I bought one from LMC long time ago. You could check there
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Old 03-25-2011, 01:45 PM   #9
JohnnyBoy350
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Re: '66 GMC: 250 I6 to 350 V8...?

Ok, I looked in the LMC online catalog and spotted the ball socket. Now my question is; on the 350 does that just screw into the block? No extra bracket like the 6 cyl?

-John
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Old 03-25-2011, 01:58 PM   #10
padresag
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Re: '66 GMC: 250 I6 to 350 V8...?

just threads in
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Old 03-25-2011, 03:17 PM   #11
mikie 1954
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Re: '66 GMC: 250 I6 to 350 V8...?

That depends on yr of block, some older ones don't have the threaded hole for the ball socket. If yours has it ,it is above the oil filter.
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Old 03-25-2011, 05:15 PM   #12
NCD1966
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Re: '66 GMC: 250 I6 to 350 V8...?

I had a 87 and newer small block that did not have the threads. I just drilled and tapped a hole to the same depth and thread pitch as the ball socket. Not hard to do.
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2021 GMC Sierra 1500 AT4 6.2
1980 Chevy Camaro z28 383ci
1990 Chevy Suburban 350 tbi 2x4 (sold)
1984 Chevy C10 sliverado short fleet
1997 Chevy C1500 short fleet

Last edited by NCD1966; 03-25-2011 at 05:16 PM.
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