Doc99SS

iTrader: (2)

Are the plugs the same depth as the LS1 plugs? And what would be a good plug for my 402 LS2 engine? Please see details in my sig. The CR should be about 11.0:1...

89Formulaws6

iTrader: (52)

i was told tr6's for my 408 and my c/r is more then that

transAm-98

iTrader: (1)

i'm running TR6's, my compression is around 11.8,

ChrisS@sdpc

We have had good experience with the NGK's. Not for sure if a colder plug is needed in your setup.

rpmauto

iTrader: (14)

i ran the tr6 in my ls1 with the juice. no problem. transam98 and 89formulaws6 are you guys running pump gas with more that 11:1 compression?? just curious i am soon to order the heads for my 402 and was thinking of going 11:0 or 11:5 to 1

Order 66

TR6 if you run stocker style cylinder heads. If you run ET or another that new cast check with the manufacturer because they use a different plug.

silver01z06

11.0 is fine for pump gas. My engine is not that high but several friends are 11.0 or higher and have 0 issues with that compression and pump gas.

BadLtBlu99TA

iTrader: (9)

how do you calculate the compression ratio for an engine with heads ?

transAm-98

iTrader: (1)

I'm running 11.8 CR on shitty California 91 octane. with the right cam and the right tune it's not a problem

Fast99408

iTrader: (-1)

in my 408 im running tr6's there the best

Slowhawk

iTrader: (12)

TR-6 gapped to .045 -.050

supersub

iTrader: (25)

Tr 55,tr-6 .045-.055 depending on comp ratio's and coldness requirements