LT1-LT4 Modifications 1993-97 Gen II Small Block V8

plug gap??

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Old 04-26-2008, 02:42 PM
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Default plug gap??

i have a 94 z28 with a forger 355 the compression is about 12.0:1 i have ngk tr6 and their gapped at .35 should the gap be opened up it currently pops through the exhaust on decel and has a slight miss unles your in it hard it goes away?...any suggestions....when i first got the motor back together the 6 and 8 plug wires were switched maybe fouled a plug?
Old 04-26-2008, 02:47 PM
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i was told that the smaller the gap the easier it is on an opti with high compression, but i had NGK in mine and they fouled out faster than i could imagine. it would clear out under WOT but begin to bog down again once i was at cruising speeds
Old 04-26-2008, 03:59 PM
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Originally Posted by mean94lt1
i have a 94 z28 with a forger 355 the compression is about 12.0:1 i have ngk tr6 and their gapped at .35 should the gap be opened up it currently pops through the exhaust on decel and has a slight miss unles your in it hard it goes away?...any suggestions....when i first got the motor back together the 6 and 8 plug wires were switched maybe fouled a plug?
The NGK specs call for 0.035 gap for that plug, which is one heat range
colder than stock, which is designed for high-compression engines. You
might want to yank the plugs, read them, clean, and re-gap them and
maybe, check the OHMS on the wires.

Is this a recent rebuild? How long has the 355 been in the car since the
rebuild? And the plugs and wires and opti?
Old 04-26-2008, 06:41 PM
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about 350 miles
Old 04-26-2008, 08:33 PM
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I just installed new TR6's set at .035" and they seem to work well so far. I'm running a bit over 12:1 and have an MSD D-6.




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