C5 Spark Plug tip

[v8d]

After 32k miles I decided to replace the plugs on the C5. Very awkward, especially #7 on the left bank. Spoke to a snap-on van chap, and they have a special double u/j plug socket just for the job. Part number S9721A if anyones interested. Makes the whole process very simple indeed. It is a nice snug fit on the plug body, so you dont snap the insulator when turning at high angles. I'm very glad I took them out. One was gapped at 25thou, (probably got dinged at the factory) and a couple had lost the platinum pads. So much for 100k mile plug service interval!! Have replaced them with NGK TR55-IX iridium parts, with a noticeable improvement in idle quality. Also changed the wires for Taylor 8mm Spiro Pro silicon ones which are cheaper than stock wires. Nothing wrong with the original wires, just the red ones look really cool. I'd suggest anyone with a LS-1 check out the plugs if you havent already done so, just to be sure.

[ZR1cliff]

Funny that,it must be a chevy trait,we also have a problem with access to #8 cylinder on ZR-1s which leads to mucking about with various tools and extensions.

[viper paul]

You guys want to try it on a Ram on # 8 when your 5 foot 6

[vetteheadracer]

Replaced all mine with the NGK Iridium ones and yes it does make a difference, I fitted the MSD wires with a set of "cool socks" to protect the wires from the header pipes.

[malc350]

viper paul said:

You guys want to try it on a Ram on # 8 when your 5 foot 6

Easier way would be to get Troy Wesvern (MiniMe) to change the plugs from underneath...!

[vetteheadracer]

malc350 said:

viper paul said:

You guys want to try it on a Ram on # 8 when your 5 foot 6

Easier way would be to get Troy Wesvern (MiniMe) to change the plugs from underneath...!

You need to get a step ladder or stand on the bumper which is what I used to do when working on my Bee.

[te51cle]

I've heard that no.7 is a pain to get out and hear many stories of missing pucks. Did you buy the plugs in the UK ?

[v8d]

te51cle said:

I've heard that no.7 is a pain to get out and hear many stories of missing pucks. Did you buy the plugs in the UK ?

I'm almost certain the ones I took out were the factory fit items. The Iridiums were sent to me by a pal in North Carolina, think he gets them from Summit, at jobber rate. $40 for 8
However, Paul at Wortec supplied me a set for the Monaro, somewhat dearer of course.