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  #1  
Old December 10th, 2021, 08:52 AM
Jeffrey Jeffrey is offline
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Hi, I have a 1964 GMC 1000 with a 305E, just acquired and never driven it, engine requires rebuild, has been sitting for years, everything needs attention or rebuilding, although it has the original faded patina paint. Wanted to run the V6, engine had been removed and still have it, but don't have the needed rebuild parts.
Looking for insight on swapping out engine to a new 350 V8, yes I know that is not popular, but have the running V8 ready to install.
Thanks, Jeff
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Old December 11th, 2021, 08:07 AM
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Ed Snyder Ed Snyder is offline
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Quote:
Originally Posted by Jeffrey View Post
Hi, I have a 1964 GMC 1000 with a 305E, just acquired and never driven it, engine requires rebuild, has been sitting for years, everything needs attention or rebuilding, although it has the original faded patina paint. Wanted to run the V6, engine had been removed and still have it, but don't have the needed rebuild parts.
Looking for insight on swapping out engine to a new 350 V8, yes I know that is not popular, but have the running V8 ready to install.
Thanks, Jeff
Hey Jeff --

As you may have guessed, the majority of forum members here are fans of the V6, and prefer to discourage the all-too-common V8 swaps. That being said, how do you know the V6 requires rebuilding? These are very durable engines, able to go over 500,000 miles without a rebuild, provided they receive proper care. And proper care is simple -- never over-revving them, and changing the oil often enough.

I'm sure most of us here hope you can get that V6 reinstalled and running again.
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1962 1000 Pickup 401M & Muncie 318 with overdrive
1962 K1000 Suburban 401M & SM420
1965 2500 Suburban 351C & SM420 with Watson overdrive
1967 CM1500 pickup 351E & NP435
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Old December 11th, 2021, 09:52 AM
Jeffrey Jeffrey is offline
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Hi Ed, so I understand from previous owner that the engine did smoke and very had low power and leaking valve seats, maybe a sticking/broken valve, and engine is coated in thick oil sludge from leakage. The engine does rotate easily but was removed from truck before I purchased it, but is complete. I have viewed a great video series from vintageiron where he completely rebuilt a 305V6, he had all of the required parts for a complete rebuild, using NOS pistons.. I had checked with a few engine machine shops, actually two that have used are closed forever, the third one closing next week, they stated that there are no parts available.
So I would believe that it will require a complete top end, and perhaps pistons, but will know once I look closer at the engine. So, is there a thread that gives more detail about rebuilding and parts accessibility, as I have seen some that are years old, where the parts mentioned are not available at a retailer? Most pressing parts would be pistons, if I only was able to locate replacement a set for a 426, as they are the same bore but with one less ring grove, does anyone have experience with those?
Thanks, Jeff
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Old December 12th, 2021, 04:49 PM
Jim A Jim A is offline
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I am going into my 53rd year riding behind my 305; it will be even better with my "new" clutch (parts also difficult).
The engine sitting out makes a perfect time for inspection.
If you can buy, rent or borrow a good leak-down tester, it will tell a great deal about the engine's past and future.
Good luck and keep us posted.
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