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Recommended spark plugs for late model head
https://slantsix.org/forum/viewtopic.php?t=52935
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Author:  hideogumperjr [ Fri Aug 02, 2013 9:12 pm ]
Post subject:  Recommended spark plugs for late model head

Hey follks, I know I have seen it here but cant seem to locate the thread for recommended spark plug for the late model heads, I have a head off of an 83 van.
Thanks.
John

Author:  DusterIdiot [ Fri Aug 02, 2013 9:16 pm ]
Post subject:  Only one...

You only have one plug available:

NGK UR-5

If you need hotter UR-4, colder for UR-6.

I found on my hipo engine builds that UR-5 was too cold, and UR-4 was too hot and ended up with AC Delco R-45TS gapped at .040 as being 'just right' for some reason.

We do not have a readily available extended tip plug like the drool tube heads guys have, so you are stuck with the above options.

Good Luck,

-D.Idiot

Author:  hideogumperjr [ Fri Aug 02, 2013 9:26 pm ]
Post subject: 

Thanks DI.
John

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