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spark plug gaps for heads/cam?

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Old 02-25-2007, 04:31 AM
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Default spark plug gaps for heads/cam?
what should the gap be on ac delco platnium plugs?? im running .050 inches

is that too wide

mods in sig
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Old 02-25-2007, 06:57 AM
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Ummmm Call TSP and ask? I knwo I will when I do my heads and cam
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Old 02-25-2007, 10:36 AM
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Good question, I'm running a .044-.045 gap on my TR6's, wondering if that's a little too tight for optimal on a H/C setup.
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Old 02-25-2007, 10:43 AM
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I would say .040 is a good gap for H/C. I know some that run .035.
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Old 02-25-2007, 06:37 PM
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i have been told to run stock gap with my set up (TR55's)
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Old 02-25-2007, 06:40 PM
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I run stock gap on my setup too, also with TR55s. When I switch to TR6s, I'll be cutting that gap down to .035-.040 for the spray though.
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Old 02-26-2007, 06:07 AM
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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
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Old 02-26-2007, 06:58 PM
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Mine are TR6 @ .045. Works well.

I heard the rule of thumb was to reduce gap .005 for every 50 BHP
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Old 02-26-2007, 08:14 PM
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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.

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
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Old 02-26-2007, 10:28 PM
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TR6's gapped at .038, but I'm putting down 500 to the ground. I would run closer to stock gap with TR55's like around .045 for your app.
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Old 02-26-2007, 11:29 PM
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I gapped all my tr6's tonight @.035-.040".
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