It is possible that the plastic crank pointer was introduced along with the
HEI ignition mid year 1975. I have seen a couple of 455 engines that had
the plastic ones. I will have to dig out my General Motors Training School
literature that I got when I went to training, and see what the upgrades
consisted of. I know the Olds small blocks came with the plastic pieces,
but, I am unsure of the EXACT DATES they were introduced. As motor homes
were kind of an "Orphan Vehicle", it is possible that GMC received some
pieces that Olds did not use in their production cars, but I do not know
that for the gospel truth. Treat this information accordingly.
Jim Hupy
Salem, Or
78 GMC ROYALE 403

On Feb 14, 2018 1:33 PM, "Carl Stouffer" wrote:

Hmmm...My 455 has a plastic one as well. Pretty sure it came that way, but
who knows???
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
Eagles,
Solar battery charging. GMCSJ and GMCMI member

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