WSsic66

iTrader: (2)

sorry if this is off topic but its
For a friend, much help appreciative::

Circle track build.
355
high compression 12:1
Running race gas
decent cam around .550 lift
750 demon race carb
and 200 shot of nitrous
esitimated hp @ 500-550
What type of plug should he use at about 32* of timing

not much known about the motor except he had autolite AP 103's

Wants to switch to NGK.

Would the TR-5 be any good ?

Thanks to the experienced ones!

87silverbullet

iTrader: (11)

With nitrous the TR5 is no no. TR55 is the plug for a stock LS1 so definately do not use the TR5.

You can go on Autolite site and find the cross reference for the AP103 then go 2 or 3 steps colder in the NGK

I'm no expert here but looking at the cross reference for an AP103 it is stock # 3344 in an NGK BP7EFVX I would call NGK and talk to them for something 2 or 3 step colder.

One tip here is that as the numbers go up in NGK plugs the plug gets colder

WSsic66

iTrader: (2)

thank you for your insight, anyone else has ideas please let me know.

Graham@NitrousOutlet

Call Brandon@NGK. Very helpful and polite. He is also a big gear head and has helped quite a few people, a few from this board as well.

Call the NGK tech number and he is EXT. 2.

createnit

great info. I will get a hold of this guy also. Need to know the best plugs to run with basically stock 2k z28 with 150 shot