I have a set of 302 heads belived to a 75 heads. Went to buy e-3 plugs they gave me the standard plugs however the heads take the peanut size. Already have heads bolted down on the engine. Need help Thank you for your help.
Jim
Head Casting numbers
Engine, ignition, fuel, cooling, exhaust
Moderators: Ranchero50, DuckRyder
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