Mort

Those plugs look OK to me. What plugs are they and what do you have them gapped to?

EDIT: Did you add some info while I typed or did I miss it ...LOL.

I would try some TR6 at around 35 thou. gap.

therock

iTrader: (2)

Those are stock iridium's at the factory .040 gap.

therock

iTrader: (2)

Forgot to include I have the 42# injectors and the 8.1 marine fuel pump both of which came in the Magnuson kit.

Mort

See previous post...LOL

Mort

That should be good at the boost level (6-7 psi) you are running.

loud5.3

I would ask the tuner if he thinks 12.5 is safe and if he says yes, ask him if he will warranty your engine if it blows. When he says no, then tell him you would like it to be just a little safer then because you don't have the extra cash to buy a new motor right now. If he balks, go elsewhere, it is your engine, not his. Where is this tuner located, Marietta or somewhere else? You can pm me the name if you wish.

terravast4

iTrader: (25)

I am about 11.4 at WOT but have seen it get to 10.8 on ocassion. I am at 10ish psi so I agree....better safe than sorry