Spark Plug

[chiefshocker]

So i did a search and a bunch of reading, but i'm still not sure what to go with. I have an 83 turbo 3.8, with a 4 barrel 600cfm Holley. I'll be driving a lot of WOT and need a lot of low end boost.. not sure on the current boost, but i hope to run around 15 (guage installation in progress)

I see threads on the NGK UR5-2771, autolite 24, R44tsx and r45tsx per the manual. Non of them cross reference to each other.. I understand the gap needs to run smaller for the turbo's.
Any recommendations on which plug to run.?

Thanks
Fred

 

[WarWagon]

Run the NGK UR5 on your drawthru setup, I ran those for along time in drawthru and blowthru configuration with no problems at bigger gap and didn't swap them out until I was going over 20# boost because they were misfiring with a stock ignition.
So my vote is for the UR5's they are a good heat range and can run a gap of.025-.032 depending of how good your ignition is.

 

[chiefshocker]

Run the NGK UR5 on your drawthru setup, I ran those for along time in drawthru and blowthru configuration with no problems at bigger gap and didn't swap them out until I was going over 20# boost because they were misfiring with a stock ignition.
So my vote is for the UR5's they are a good heat range and can run a gap of.025-.032 depending of how good your ignition is.

Thanks,, I ordered some online.. They came in yesterday.. I left them all at .032.. I'll try it out this week.. Thanks

 

[mikemcvaney]

Is your holley boost referanced?

 

[chiefshocker]

Is your holley boost referanced?

Its not, but the powervalve is higher than normal half the idle vacuum plus 2