540 BBC-what spark plugs

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07-21-2020 | 01:35 PM

H8TOLUZ

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540 BBC-what spark plugs

Just finished my 540 build, Dart block, Canfield aluminum heads with 9.5:1 compression. Stock heat range plug be fine or should I go a step colder?
I believe I have BPR6ES’s in there now which I believe is stock heat range for 502.

Last edited by H8TOLUZ; 07-21-2020 at 01:38 PM.

07-21-2020 | 02:13 PM

F-2 Speedy

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do those heads use a crush washer ?

07-21-2020 | 02:32 PM

getrdunn

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If your going to stick with ngk I’d step down to 7’s and keep an eye on your ground straps. I never had much luck with ngk’s except in 2 strokes.

07-21-2020 | 02:34 PM

H8TOLUZ

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Quote:

Originally Posted by F-2 Speedy

do those heads use a crush washer ?

yes, crush washer style

07-21-2020 | 02:34 PM

H8TOLUZ

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Quote:

Originally Posted by getrdunn

If your going to stick with ngk I’d step down to 7’s and keep an eye on your ground straps. I never had much luck with ngk’s except in 2 strokes.

what is it that makes them unlucky with you?

07-21-2020 | 02:51 PM

getrdunn

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Quote:

Originally Posted by H8TOLUZ

what is it that makes them unlucky with you?

Fouling and would rarely pick cylinders back up. I’ve always had good luck with ac delco and autolite. But what ever brand you prefer and have had good luck with. Heat range as you mentioned most important.