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What is plug gap for a 67 400 w/HEI?

   
Old March 28th, 2009, 06:12 PM
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What is plug gap for a 67 400 w/HEI?
As far as I know, the internals are stock, with a later years Olds HEI added.

What should plug gap be?

Any particular recommendations on plugs?

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Old March 29th, 2009, 01:20 PM
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when i add HEI i go with the spark plugs and gap setting from a 77 cutlass. i do not know if this is the best method or not. i don't know the gap off hand.
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Old March 30th, 2009, 12:34 AM
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Smile Gaping gap
Originally Posted by jensenracing77
when i add HEI i go with the spark plugs and gap setting from a 77 cutlass. i do not know if this is the best method or not. i don't know the gap off hand.
X2 on the '77 setting or that era, the gap for a '67 with UHV is .045, as for plugs try R44S for general rushing about..
Last edited by Yellowstatue; March 30th, 2009 at 12:37 AM.
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