| Re: 455 or 403 in my coach? [message #361614 is a reply to message #361611] |
Sun, 10 January 2021 12:14   |
C Boyd
Messages: 2629
Registered: April 2006
Karma:
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Senior Member |
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Sir, if it is factory OEM.... the steel fuel line from fuel pump to carburetor is routed to the left of the top radiator hose on a 403 and is routed to the right of the radiator hose on a 455. A 403 will have an idle solenoid stop on the carburetor shaft and an extra vacuum tree on drivers side to control the electric solenoid on the front of the drivers side head which is fed from a solenoid bolted on the front of the passenger head.. A 403 and a455 have the same number of detents for valve cover bolts but 403s are only tapped and drilled in every other one. On a 403 it is cast on the side of the block in big numbers. A 455 is a big block and will have a sunk down intake to clear the floor. A 403 is a small block and does not need the lower intake. A 403 has a more noticeable dog leg in the pass exhaust manifold to clear the oil filter and cooler adapter.
boybach wrote on Sun, 10 January 2021 12:28Don't know for sure what engine is in my rig, did a quick search in the archive and unfortunately the "how to tell" link is dead but did come across this
> Changeover began on Mar 1st 1977 with TZE167V101285 for GM finished
> coaches and TZE337V101287 for Transmodes.
>
>
>
> David Lee Greenberg
I just found out my VIN is TZE167V101295, so 10 units after the changeover to 403? Is this correct, there's definitely a 403 in my 77 Palm Beach?
I just registered the coach's VIN with the GMC Motorhome Registry and found out it was registered a few times before - originally in Tucson AZ then Palmer Lake CO 2010 then Bakerfield CA 2014 (where the PO bought it and imported it to Canada)
Larry
C. Boyd
76 Crestmont
East Tennessee
[Updated on: Sun, 10 January 2021 12:20] Report message to a moderator |
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