489 with 9.8 to 1 comp, alum heads 2.25 and 1.88 valves, solid roller cam victor jr intake. any ideas on type of spark plug to run with this and the heat range?
489 with 9.8 to 1 comp, alum heads 2.25 and 1.88 valves, solid roller cam victor jr intake. any ideas on type of spark plug to run with this and the heat range?
If you use NGK racing plugs, go with a -7 heat range. I believe the 3/4 reach gasket with projected tip is R5672a-7. Non projected tip (my preference) is R5671a-7.
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