NGK PLUGS

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At $10 each it may sound pricey but they will be the last set you will ever need. Long lasting.
As long as your engine is healthy
 
What heads does it have?
That ngk plug has a 13/16" hex
And may not fit in some aftermarket heads.
Factory LA heads would be fine.
Ngk probably has an equivalent plug with 5/8" hex...
I should have started with,
What Engine do you have and what's the build info, use, etc...
 
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BTW the 97382 is the stock number and GR4IX tells you what the plug is per the chart below.

BKR6E is what I run in my small blocks. Both iron and alum heads

IMG_5396.jpeg
 
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What heads does it have?
That ngk plug has a 13/16" hex
And may not fit in some aftermarket heads.
Factory LA heads would be fine.
Ngk probably has an equivalent plug with 5/8" hex...
I should have started with,
What Engine do you have and what's the build info, use, etc...
360 j heads 9 2 1 30 over
 
360 j heads 9 2 1 30 over
Ok the spark plugs will fit those heads
(As long as the threaded length is not too long.)
But it's ngk 4 heat range which is a little on the hot side in my opinion.
Maybe something in a 5 or 6 heat range
Would be a better choice.
I run a different brand spark plug.
But I'm sure there's people here that can help with a ngk suggestion.
 
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