What spark plugs do you run...and what do you gap them at so the spark does not get blown out..

and what kind of boost are you running.....

I run NGK Tr-6's gaped at .32 ........ however I do still have three that are gaped at .40 ..#3 ,#5 and #7.they are a bitch to get to....and I think thats were my high rpm missing problem is coming from.....

 

I KNOW im not the only one with plugs..... come on guys......spill it!

 

Ok I was running 104's gapet at 37 with 14LB of boost and a MSD6A But i added a 50 shot of nitrous and whent to 103's gaped at 35 with 14LB of boost. The rest is in the down below.E-mail if you have any questions. troy

 

TR-6's gapped at 0.035"

 

hows that working out for you......???

 

autolite 104's gapped @ 0.032

 

NGK BPR11ES gaped to 0.035" (for AFR heads).

15PSI + a small nitrous shot.

Rich Krause

 

So how come you went with NGK BPR11ES ........ whats the difference between that plug and the NGK R tr-6?

 

It's the wrong size for an LTx casting, I am using AFR's. But the rationale for the plug is that it is very cold - 5 heat ranges colder than the TR-6. Interstingly, I have had no problems with fouling.

Rich Krause

 

>Is your car used everyday as a "daily driver " ?
I must guess (don't like to assume ) that you are also using one of the ignition boxes too ? MSD , Crane , etc.

 

I put about 4,000 miles on it last year including stop and go traffic. I was using a Crane box and it crapped out this year, so I am now using an MSD. BTW: I use OEM plug wires! Cheap, they fit right, and I can't say the car is suffering performance wise.

Rich Krause

 

I run Autolite 103's gapped at .035. I run these on AFR heads too.

Rich,

What do you mean your plugs are for AFR heads? I didn't know there was a difference in the plugs from the LTx castings and AFR's. Can you elaborate on this?

Bill

 

The "reach" (length) of the plug is different. The LTx castings usually use a 14mm reach. The AFR heads with large chambers (as I use) use a 3/4" (19mm) reach.

Rich Krause

 

i was reading a while back where people were having problems while running the MSD6AL and the plugs gapped at .032-.035, they were stating that the optis were burning up, or just going bad. have you guys had any of these problems. what do you think about the accell box, good and bad.... thanks

 

I was using Champion RS12YCs but with the new motor I'm going to RS9s. I ran as much as 21psi before the engine let go but it was fine and dandy with 14psi.