305fan

Just looking for some advice on new plugs for my Formula.

I have the "Vortec style" Edlebrock 170cc E-Tec heads.

I found this NGK tech bulliten and was thinking of going with the plugs listed:


http://www.ngkplugpro.ca/content/con...inderHeads.pdf


my question...what heat range do I get? (regardless of plugs) I have 9:1cr--I beleive

Kevin91Z

Any spark plugs compatible with aluminum heads are fine.

With 9.0:1 compression (pretty low for aluminum heads) you're fine with the stock heat range.