Spark plugs and gap question
Thread Starter
Teching In
Joined: Dec 2008
Posts: 31
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Spark plugs and gap question First off I would like to say that I searhed the forums for information. The issue I am coming up with is a wide range of information. I would like to try and narrow it down to something that will work well in my car.
I am building a 1985 C4 corvette with a LS1 and 4L60E. My LS1/4L60E came by way of a wrecked 2001 Z28. The car will be NA.
Here is the hardware:
Stock bottom
Milled 243 Heads with lightweight valves (out of a 2002 Z06)
The factory LS1 rocker arms (off my LS1)
Factory length rods
GM LS7 lifters
factory head gaskets
TSP Torquer V2 cam
LS1 Double roller timing set
Ported LS6 oil pump
LS6 intake
180* Thermostat
Full length headers
Full flow mufflers (no cats)
3500 stall torque converter
Does anyone have a spark plug and gap reccomendation?
Thanks,
Mark
I am building a 1985 C4 corvette with a LS1 and 4L60E. My LS1/4L60E came by way of a wrecked 2001 Z28. The car will be NA.
Here is the hardware:
Stock bottom
Milled 243 Heads with lightweight valves (out of a 2002 Z06)
The factory LS1 rocker arms (off my LS1)
Factory length rods
GM LS7 lifters
factory head gaskets
TSP Torquer V2 cam
LS1 Double roller timing set
Ported LS6 oil pump
LS6 intake
180* Thermostat
Full length headers
Full flow mufflers (no cats)
3500 stall torque converter
Does anyone have a spark plug and gap reccomendation?
Thanks,
Mark
Thread Starter
Teching In
Joined: Dec 2008
Posts: 31
Likes: 0
I am still a little upside down on the gap. The manual i have for the LS1 is calling out 60, Allthrotle is coming in at 50 and the parts store where i bought the plugs (thanks allthrotle) is telling me I need to gap the ngk tr-6 vpower plugs that allthrotle recommeded at 35.
So, anyone want to chime in on this?
Thanks,
So, anyone want to chime in on this?
Thanks,
I tried stock gap (60) with my new NGK TR-5's and it would barely idle. I closed them to 50 and it was a lot better. My friend that works at Advanced Auto pulled up the plugs in the computer and they had a Service Bulletin Announcement that said gap them to 40. We did and it runs perfect. My vote is for 40!
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First off I would like to say that I searhed the forums for information. The issue I am coming up with is a wide range of information. I would like to try and narrow it down to something that will work well in my car.
I am building a 1985 C4 corvette with a LS1 and 4L60E. My LS1/4L60E came by way of a wrecked 2001 Z28. The car will be NA.
Here is the hardware:
Stock bottom
Milled 243 Heads with lightweight valves (out of a 2002 Z06)
The factory LS1 rocker arms (off my LS1)
Factory length rods
GM LS7 lifters
factory head gaskets
TSP Torquer V2 cam
LS1 Double roller timing set
Ported LS6 oil pump
LS6 intake
180* Thermostat
Full length headers
Full flow mufflers (no cats)
3500 stall torque converter
Does anyone have a spark plug and gap reccomendation?
Thanks,
Mark
I am building a 1985 C4 corvette with a LS1 and 4L60E. My LS1/4L60E came by way of a wrecked 2001 Z28. The car will be NA.
Here is the hardware:
Stock bottom
Milled 243 Heads with lightweight valves (out of a 2002 Z06)
The factory LS1 rocker arms (off my LS1)
Factory length rods
GM LS7 lifters
factory head gaskets
TSP Torquer V2 cam
LS1 Double roller timing set
Ported LS6 oil pump
LS6 intake
180* Thermostat
Full length headers
Full flow mufflers (no cats)
3500 stall torque converter
Does anyone have a spark plug and gap reccomendation?
Thanks,
Mark
If you gap them anywhere from .045-.055 it will work on any N/A pump gas LSx engine from bone stock to 700 RWHP. There will be zero difference in performance between that range or even a larger range. Its just not that important with an N/A pump gas engine.
I've tried gaps from .040-.060 on my 427ci and there is absolutely zero difference all through the rpm range. NOTHING.
.
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11 Second Club
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From: Was New Orleans, but swam to Baton Rouge
Well, I am running Tr8 plugs with a .035 gap due to nitrous. Once I broke 450 rwhp though I went from Tr55 plugs to Tr6 plugs with the same .055 gap. I only closed the gap for nitrous, but once I got to a certain rwhp level I noticed the engine prefered a slightly colder plug.
