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A 1965 Chevy didn't come with a 350 and HEI. Best guess would be to use a spark plug for a vehicle that came with that engine and ignition. If the engine has iron heads, it probably needs a tapered seat plug. A good starting point would be R44TS or R44T(with washer) if not a tapered seat plug. For plug gap, try about .045".

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14y ago
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Q: What is the correct spark plug for 1965 Chevy 350 with HEI?
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