Need some help w/ Pro Action heads. What plugs??

[LT1Nova]

I just figured out that the old plugs from my "double hump heads won't reach into the chamber on my new Pro Actions. So what spark plugs do I need? The ones I use are AC Delcos that are 2 ranges colder than stock for gobs of nitrous.:D Also, there's a threaded hole on the side of each head. What do I need to plug that big bastard and what's it for? Thanks for the help!

[krly79]

The holes are probably for a temp sensor, from what you describe. If you want to plug them you can get a plug from home depot or lowes or something like that. As for you plugs being short, you might be able to have them cross reference them to another set that is the same, but longer. :shrug:

[Cashmunson]

the hole on the drivers side head is my temp gauge sensor for the gauge inside the car. I'm not sure what the other one is for.

[SLEEPER 86]

same thing dude the heads are cast the same, there is no right or left.krly is right you just need a pipe thread plug,if you want an original,go to the junkyard and grab one,i'm not sure of the thread size,but it's a good place for teflon tape or better locktite as it's a direct hole into the water jacket.
Eric

[SLEEPER 86]

which toplines do you have?

[LT1Nova]

This is a real old post and I figured out the problems. Now I've just gotta figure out how to get my torque and power back. These are the 220cc heads and they're way too much on motor but it feels pretty good on the spray.