spark plug gaps for heads/cam?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
It depends on your compressions. Both SCR and DCR
For every 1 point up in SCR without going over 8.5 DCR, reduce .010>.015 to .040>.045 range
Now, the same but over 8.5 DCR then reduce also 1 heat range
For every 1 point up in SCR without going over 8.5 DCR, reduce .010>.015 to .040>.045 range
Now, the same but over 8.5 DCR then reduce also 1 heat range
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my tr55's are gapped at .040. i like my gaps tight 
but ya this is what ive heard as well.
but ya this is what ive heard as well.
Originally Posted by GuitsBoy
Mine are TR6 @ .045. Works well.
I heard the rule of thumb was to reduce gap .005 for every 50 BHP
I heard the rule of thumb was to reduce gap .005 for every 50 BHP
