I finally decided to install new NGK TR55 plugs with Taylor wires. My original plugs had only 8800 miles on them and my car was running strong, so I believed. I wouldn't really notice much of a difference by making this change and did it primarily to see whether I was running rich or lean. As it turned out I was right on the money as far as air/fuel. In any event my engine feels like it picked up another 30 horsepower. I know it didn't but what a SOTP difference it made. I know it's not my imagination and I really don/'t understand why the major improvement but like they say , don't look a gift horse in the mouth, and I won't.

 

Yep pretty good plugs, plan on changing mine yearly, piece of cake to change. By the way noticed you have a Granatelli MAF, how do you like it? Most people on the forum are against them.

 

Great. You likely had some of the platinum pucks on the outer electrode missing on your factory plugs too. That really hoses up the gap. The TR55's are great plugs, for smoothness, and smooth heat dissapation characterisics.

 

Where can I get these plugs and how much?.....Thanks

 

O'Riellys carrys them as do many of the vendors on this forum. Price at O'Riellys is $1.65 ea :reddevil

 

Try a forum vendor GaryZ06. They help sponsor the forum.
Their banner/icons are down the right hand side of your screen.

XtremeMotorsports sells the NGK 55 plugs ($22 for a set of 8)
LAPD sells the NGK TR6 plugs ($32 for a set of 8).

I went with the TR6 plugs myself since they are more for supercharged engines.

 

Cool thanks......Do you think it is to my advantage to change to these plugs?My car has 13,000 miles.....Thanks .... Oh are the plugs very accessible to get to? In other words are they easy to get to?

 

If you realize half of the improvement that I did it is worth making the change. The rear plug on the drivers side is a real bear to get to even when you remove the hose to the brake resevoir and the hose to what appears to be an egr valve on the manifold. I followed the recommendations by KEWLBRZ in tech tips and they were very helpful but that one plug took about 45 minutes to remove and replace the rest took the same amount of time for all of them together and they were fairly easy. You will definitely need the Snap ON double swivel spark plug socket to get to that and a few of the other plugs. Aside from that one b-strd plug the others loosened with the plug wrench and were easy to remove and replace with a separate plug socket (with rubber inset to hold plug) and a two or three inch extension. Make sure you work when the engine is cool, use antisieze compound on the new plugs and dielectric jell on the ends of the wires . I bought my set from Steve Merenkovich on the Forum almost a year ago and finally put them in. They were not too expensive but I can't recall the price.
I hope you have small hands for that one plug. I don't and have a lot of cuts and scratches to prove it. Love those Vetts.

 

Thanks for the info......What do I set the gap at ?

 

They came with a gap of .57 and I did not change them. The gap should be no less than .55 or more than .60 but I think the latter is too much gap. Have fun.