View Poll Results: Which plugs work best for the LT1?
TR6
4
5.56%
NGK TR55
41
56.94%
Factory AC Delco platinums
13
18.06%
Autolites
9
12.50%
Bosch Platinum +4
4
5.56%
Other..
1
1.39%
Voters: 72. You may not vote on this poll
Which plugs are best for the LT1
yeah scratch what i said about the bosch platinums... they run like hell... i thought my opti was what was causin my skipping problems, and the opti did end up failing, but with a new opti on it it is still missing... so ngk tr-55's for me next week!
Another vote for NGK TR-55s here (v powers), no problems....And Ive used NGKs on alot more stuff than just mine...Also love the stock GMs, can never ever go wrong with GM factory....
Banned
Joined: Feb 2008
Posts: 325
Likes: 0
From: I moved to over there
I have run
NA
4 Iron and 2 Aluminum head combo’s all used TR 55 with stock gap with up to 150 Juice and no problems.
Boosted
Iron TT 12 psi MSD box, Iron TT 15 psi MDS box, Iron Vortech 12 psi Delteq, Aluminum Single Turbo 9 psi Delteq all run great with TR 55 gapped @ .035
I prefer using Autolite 106 gapped .035 because it is easier to get a consistent gap, but the TR55 WORK so my preference is for esthetics only.
I tried TR 6 and Autolite 104’s, but couldn’t get them to fire consistently at idle. I tried changing the timing fuel etc always would foul if they idled long (start to foul idling at a lite). Tests were in 8.5 CR boosted vehicles, since TR55 work in a wide range of setups I would recommend keeping it simple use TR55.
NA
4 Iron and 2 Aluminum head combo’s all used TR 55 with stock gap with up to 150 Juice and no problems.
Boosted
Iron TT 12 psi MSD box, Iron TT 15 psi MDS box, Iron Vortech 12 psi Delteq, Aluminum Single Turbo 9 psi Delteq all run great with TR 55 gapped @ .035
I prefer using Autolite 106 gapped .035 because it is easier to get a consistent gap, but the TR55 WORK so my preference is for esthetics only.
I tried TR 6 and Autolite 104’s, but couldn’t get them to fire consistently at idle. I tried changing the timing fuel etc always would foul if they idled long (start to foul idling at a lite). Tests were in 8.5 CR boosted vehicles, since TR55 work in a wide range of setups I would recommend keeping it simple use TR55.
Banned
Joined: Feb 2008
Posts: 325
Likes: 0
From: I moved to over there
If my setup runs rich for whatever reason, I change the plugs, I don't expect MSD or any amount of driving to clean them I can afford to replace them because TR55 are a LOT cheaper than the others. It is a pain to replace them but not that bad once you do it and figure out the combinations of wrenches and sockets.
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I refuse to run the Bosch +4 plugs they suck major butt, I ran them once and only once. the only problem with NGK I have ever had is not all auto part stores stock them, all else is all good 
Interesting thought, but how many people have 'worn out' a set of plugs on an LT1? I contend 1 in 9,999 at best was a plug problem the others were fouled from running rich. No plug is better than another at recovering from fuel fouling IMO.
If my setup runs rich for whatever reason, I change the plugs, I don't expect MSD or any amount of driving to clean them I can afford to replace them because TR55 are a LOT cheaper than the others. It is a pain to replace them but not that bad once you do it and figure out the combinations of wrenches and sockets.
If my setup runs rich for whatever reason, I change the plugs, I don't expect MSD or any amount of driving to clean them I can afford to replace them because TR55 are a LOT cheaper than the others. It is a pain to replace them but not that bad once you do it and figure out the combinations of wrenches and sockets.
