[GN138]

When I look at the spring cleaning guide and recipes on gnttype.org, it says "For cars running 12's and down run AC R42 plugs..."
Since we are over a mile above sea level and thus the typical 12 sec run is a high 12 to low 13 up here, would I still use the R42 or the R43? I don't know if the plug recomendation is based on ET or boost that you are running. Any help? Know what I mean? Thanks,

Justin

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87 GN, hotwired Walbro 340, RA volt booster, blue IC hoses, home made CAI, RA 93 chip/ KB Hotflash, AFPR, gutted cat, pinon snubber, engine tie down and free mods.

 

[Orlando_87GN]

Try the 42's and you will switch back to the 43's..

Don't know who came up with that hard fast rule, but it doesn't apply to any of my cars.

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Stock Block, Stock Cam, PTE-52, Champion Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, 16position MaxEffort Chip. 3680# with Driver
12.0 @ 116.5mph w/20psi using 17.9* timing

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