Author Topic: 1972 455 tune up spec questions  (Read 746 times)

rjpohl

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1972 455 tune up spec questions
« on: May 07, 2018, 08:19:53 AM »
I have engine stamped 455 with 3 expansion plugs on each side.
the engine code is YC, the heads are 7M5, I believe this to be a 1972 250hp engine.  I haven't been able to read the engine date code since engine is in the car.

right now it has autolite 666 plugs and they are gapped at .060, when I looked the engine up on the autolite website it didn't list this plug.

Need to know if these are the correct plugs or what you suggest to use.
What is the proper timing setting?

thanks
Bob

1972 455 tune up spec questions
« on: May 07, 2018, 08:19:53 AM »
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