6066 (1960-1966) GMC Truck Club
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6066 (1960-1966) GMC Truck Club (https://6066gmcclub.com/index.php)
-   GMC V6 and V12 Engines (https://6066gmcclub.com/forumdisplay.php?f=9)
-   -   478M Loosening Rod Bolts (https://6066gmcclub.com/showthread.php?t=49859)

bluestreak1854 January 29th, 2017 10:29 PM
Re: 478M Loosening Rod Bolts
 
Redneck sir, I have a 478M out of a 8000 COE truck that only has 8696 miles on it. It has a Allison 6 speed auto transmission and I have all the mountings, radiator, shifter, and short drive line, everything to install it. I also have a 305V61 Clark 5 speed and a 6041 4 speed brownlite with shifter and pts if your interested.

1972RedNeck January 29th, 2017 11:28 PM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by bluestreak1854 (Post 66143)
the 401 and 478 have an externally balanced crankshaft-- that means that the flywheel and harmonic balancer have the counter weights on them-- if someone has the wrong flywheel or balancer on this engine it could be sending vibrations that are loosening the rod nuts-- but the vibration should be very noticeable
That is definitely something to check.

Also, only the 379, 432, and 478 have externally balanced flywheels. The 401 should be the same crank as a 305 and 351.

1972RedNeck January 29th, 2017 11:29 PM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by bluestreak1854 (Post 66148)
Redneck sir, I have a 478M out of a 8000 COE truck that only has 8696 miles on it. It has a Allison 6 speed auto transmission and I have all the mountings, radiator, shifter, and short drive line, everything to install it. I also have a 305V61 Clark 5 speed and a 6041 4 speed brownlite with shifter and pts if your interested.
I would be very interested. Do you ever travel up towards Montana? Texas is a long ways but if we could meet somewhere in the middle...

1972RedNeck January 29th, 2017 11:30 PM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by ilvracn (Post 66097)
are the mopar rods the same length?
I doubt it but I don't know. Due to the increased stroke, they will need to be shorter, but it doesn't mater as custom pistons will be needed anyway.

Mike Caldwell January 30th, 2017 02:02 AM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by bluestreak1854 (Post 66148)
Redneck sir, I have a 478M out of a 8000 COE truck that only has 8696 miles on it. It has a Allison 6 speed auto transmission and I have all the mountings, radiator, shifter, and short drive line, everything to install it. I also have a 305V61 Clark 5 speed and a 6041 4 speed brownlite with shifter and pts if your interested.
How much do you want for the 478? I've got family in Lubbock and may be down that way this summer and sure would like a good running 478.

PM me with details!

1972RedNeck January 30th, 2017 02:14 AM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by Mike Caldwell (Post 66159)
How much do you want for the 478? I've got family in Lubbock and may be down that way this summer and sure would like a good running 478.

PM me with details!
Hey, I got first dibbs...

Mike Caldwell January 30th, 2017 02:20 PM
Re: 478M Loosening Rod Bolts
 
Quote:
Originally Posted by 1972RedNeck (Post 66160)
Hey, I got first dibbs...
Yep, but if you pass I want to be second in line:thumbsup:


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