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540 BBC-what spark plugs

Old 07-21-2020, 02:35 PM
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Default 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 BPR6ESs in there now which I believe is stock heat range for 502.

Last edited by H8TOLUZ; 07-21-2020 at 02:38 PM.
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Old 07-21-2020, 03:13 PM
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do those heads use a crush washer ?
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Old 07-21-2020, 03:32 PM
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If your going to stick with ngk Id step down to 7s and keep an eye on your ground straps. I never had much luck with ngks except in 2 strokes.
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Old 07-21-2020, 03:34 PM
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Originally Posted by F-2 Speedy View Post
do those heads use a crush washer ?

yes, crush washer style
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Old 07-21-2020, 03:34 PM
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Originally Posted by getrdunn View Post
If your going to stick with ngk Id step down to 7s and keep an eye on your ground straps. I never had much luck with ngks except in 2 strokes.

what is it that makes them unlucky with you?
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Old 07-21-2020, 03:51 PM
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Originally Posted by H8TOLUZ View Post
what is it that makes them unlucky with you?
Fouling and would rarely pick cylinders back up. Ive 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.
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Old 07-21-2020, 03:51 PM
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What does Canfield suggest
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Old 07-21-2020, 04:03 PM
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Originally Posted by GPM View Post
What does Canfield suggest
Dint hold me to it but I believe 3924 autolite
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Old 07-21-2020, 04:19 PM
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If so that would be a good place to start
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Old 07-21-2020, 04:19 PM
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what will this cross over to

NGK R5671A7 4091

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