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I am in the process of reporting my 1990 sundancer. I know the casting number from the heads are 3917215. Can anyone help me out to find the correct spark plug for it?
Those heads cross to 68-69 closed chamber big block heads, pretty desirable in the auto world, anyway, stock was AC Delco R43. If you have a pretty high compression motor and want to run a cooler plug, an R42XLS would work.
I am in the process of reporting my 1990 sundancer. I know the casting number from the heads are 3917215. Can anyone help me out to find the correct spark plug for it?
