I just bought a gorgeous 95 Z...green w/t-tops. It was female owned and meticulously cared for, you'd be amazed at the shape this is in and the life left in the engine. Anyway, I'm replacing all the filters and figured I'd do the plugs as well. For a completely stock 95 LT1, what are thoughts on plugs? From what I've been able to gather, these bosch platinum are pretty decent. Are these what I need, too good, not good enough, etc...?

 

NGK TR55 Iridium. Anyone I know who has used the Bosch multi-electrode platinum plugs has not been satisfied with them.

 

+1 ^.....When I bought my car it had half Bosch +4's and half original Delcos....Missed like an S.O.B. I put it the TR6's from NGK and have zero issues, car even runs a tad but cooler on the temp side as well... I would and will stick with NGK's.....2.19 a plug or 7.10 a plug for original spec Delco's you decide

 

The NGK iridium plugs are priced close to the AC Delco plugs as well. You're comparing copper plugs to platinum/iridium plugs.

For a stock engine, use the TR55IX plugs...they have the stock heat range and gap. IX means iridium....

 

Thanks for the replies guys, I'm liking this forum already! I have yet to pull a plug to see it's condition (or what type of plugs are in there for that matter), but if I see just cause to replace them, I'll go with the NGK's. Car has 75k on it and has been babied. Idles at a steady 600rpm until you hit it..me and my son drove it back from Jersey last week when we bought it (to albany ny), 4 hour trip and had no overheat issues whatsoever, except for the pesky check coolant light, which i'm finding is a common problem with these..maybe the sensor. Engine temp has never approached red. I don't think I'll be able to fit one of my paws in there to change a plug so looks like my boy will be doing it..

 

Be sure to use a little anti-seize on the plug threads and thread them in by hand, being sure they start correctly/smoothly. The biggest rookie mistake is cross threading a plug into an aluminum head.

 

By anti-sieze, you mean lightly oil the thread on the plug, or is there actually a product named anti-sieze?

 

I just replaced my Bosch Platinum +4s with NGK TR55 Platinum's. Can't really tell a difference since I also replaced my ORP pipe/cutout with a high-flow cat at the same time.

Yeah, there is a product called anti-seize (different brands - Never-Seize is one) and I used this on the plug threads.

 

Be sure to use an anti-sieze that is O2 sensor safe when using it upstream of the sensors. If it doesn't say that it's sensor safe then it isn't. They make it...you may just have to look around for it.

 

ah...understood. So basically this stuff is the opposite of loctite...thanks all

 

 

Gotta love Shoebox.....Always has the picture everyone else is looking for!!!