JimSwan

iTrader: (3)

hey, i was just wondering abut spark plug gap, in the past i never changed the gap on other engines where i did head and cam swaps, but my question is this im runin a stock bottom end ls1 with ms3 cam and tsp 5.3l 2.5 ported heads, is there any gap that i should be putting the plugs at or should i just go with the stock gap?

Damian

iTrader: (89)

Since you've increased compression with your 5.3L heads, you'll need to back down the gap a little bit. If you're using TR55's, I'd go around .048 depending on your compression ratio.

For my heads/cam cars I build I like using the TR6 plug (a step colder) gapped .044. Works perfect especially for high compression engines and they never have false spark knock.

JimSwan

iTrader: (3)

yeah i was figuring that, im goin wit the tr 55 ix's and the ratio i belive is 10.75:1 with those heads.. thanxs for the help i wanted to double check

Smokin00WS6

iTrader: (4)

what is the stock gap? what would gap be for tr55?

JimSwan

iTrader: (3)

i believe .060

Mike94ZLT1

iTrader: (3)

I run TR6's gapped at .038

Smokin00WS6

iTrader: (4)

Thanks guys.

Z28/2002

iTrader: (27)

Same here

Smokin00WS6

iTrader: (4)

But you are gapping it at .038 becuase of your mods right. I dont think a mainly stock car would need gapped at those numbers right. All I have is a headers exhaust car when you come right down to it. So shouldnt I be higher.

Z28/2002

iTrader: (27)

The main reason I am running them is because I'm running nitrous. I ran them in my cam only 02 Z28(sprayed too) and it ran awesome on motor with the TR6s


You will be fine running the 55s