pgreene4

i have a 1993 Z28 with a newly rebuilt 383 Stroker. should i use stock spark plugs go colder or go hotter?
im not sure what info will help i have stock heads ported polished and gasket matched with bowl blending, gasket matched intake, 32 LB injectors long tube headers 11.5:1 compression
any help is appreciated
Thanks

bowtienut

iTrader: (1)

I'd go one step colder. For NA: NGK TR6 or Autolite AR103.
Stay away from platinum plugs for any performance use.

quik95lt1

iTrader: (7)

yea start with tr6 plugs read them if you can go warmer to tr5 do it.......start too cold and you just waste $25 fouling plugs start to hot and you can detonate and waste a motor....

speed_demon24

iTrader: (6)

I'm running autolite 104's with my setup. I never had good luck with any NGK plug.

pgreene4

Thanks for the help !!

Konman93

I have a 93 z28 with N20, I've been running NGK tr6 and never had a problem. I got all my friends running them to and no problems.