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2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

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Old 06-30-2010, 04:14 PM
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Default spark plug cross

I have been looking on the web. And can't find what I need. I want a ac delco plug that is standard and one degree colder than stock the stock is 41-985 can't find anything that will list a standard plug. Any help would be great.
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Old 06-30-2010, 05:10 PM
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not gonna find a listing for heat ranges for these plugs. it's not coded in the number. 41 is a stocking/tracking number for ac delco. 985 is a 900 series plug, a double platinum type. 85 is the application number, being the 85th 900 series plug made. trying to use a colder or hotter plug in a computer controlled car may cause damage.
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Old 06-30-2010, 07:00 PM
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they do have a heat range in the number the number 5 is the heat range. I just can't use a platinum plug. I need a old school spark plug. if I use a stock plug I will cause alot of damage to my truck and I will melt the plugs. I need to cross the stock number of a platinum plug to a standard old school plug. and can't find the info anywhere.
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Old 07-01-2010, 10:50 AM
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I think you are wrong on the heat range for the AC delco plug. The last # is the heat range for Autolite plugs but not AC Delco.

On AC Delco plugs the second # is the heat range.



The ACDelco Spark Plug Identification Table

Prefix and suffix letters are used to identify a specific type plus the numbers relate to thread size and heat range. For example, the R45TS spark plug shown is:
  • R = Resistor
  • 4 = 14 mm Thread
  • 5 = Heat Range
  • T = Taper Seat
  • S = Extended Tip
Plug Identification Table Prefix
Identification CodeDescription
BSeries Gap
CCommercial
CSChain Saw
FFine Line 14 mm 5/8" Hex
MMarine
LMLawn Mower type
RResistor
SShielded (5/8-24 thread)
VSurface Gap
Prefixes are sometimes combined e.g., VB, CR
Numbering
  • 1st number denotes THREAD SIZE
  • 2nd number denotes HEAT RANGE
In the early 1990s, an all-numeric, identification code was developed to ensure that the proper spark plug would be selected for replacement in specific engine applications. The numeric code does not in any way correspond to the heat range of the spark plug. Therefore, selection of a spark plug with a different code number is not recommended. The heat ranges may be drastically different between two different plugs, and engine damage or poor performance may result. See your local installer or retailer for details.
The prefix “41” stands for the manufacturer’s product line (e.g., 41 = spark plug)
Numbers after the prefix indicate the type of spark plug and also the specific application:
  • 100 – 199 = Iridium
  • 600 – 699 = Resistor
  • 800 – 999 = Double Platinum
Plug Identification Table Suffix
Identification CodeDescription
AClip Gap
CCopper Core Center Electrode
CColder Version of M44 Plub
ESpecial Design Electrode Extended Tip
F1/2" (12.7 mm) reach
FF1/2" (12.7 mm) reach, fully threaded
GPin Gap (cold-running)
IIridium Center Electrode
JBoot Release Agent, Anti-Seize Compound
KSpecial Design
LLong Reach
7/16" (11.1 mm) reach, (14 mm) thread
3/4" (19 mm) reach, (18 mm) thread
3/4" (19 mm) reach, (14 mm) thread (fineline)
LTLong reach, .715" (18.16 mm), Tapered Seat
MSpecial Design Electrode
N3/4" (19 mm) reach, 3/8" (9.5 mm) thread length
RResistor (Sport Vehicle Plugs)
SExtended Tip
S7/8" (22.3 mm) Moderate Long Reach
23/32" (18.25 mm)
TTapered Seat Shell Design
TSTapered Seat with extended tip
XLExtra Long Reach, 3/4" (19 mm) fully threaded
Y3-Prong Cloverleaf Electrode
ZSpecial Gap (usually denotes wide gap)
5.050" (1.3 mm) gap
6.060" (1.5 mm) gap
8.080" (2 mm) gap
100Iridium
600Resistor Type
800Platinum Type
900Double Platinum Type
Suffixes are combined to form such AC suffix designations as FG, XLS, TS, FFM, TSX, SZ, etc.
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Old 07-01-2010, 11:01 AM
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thanks cooter26, that's the info i was looking for to help LARIDERS.
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Old 07-01-2010, 01:10 PM
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thanks for the info. the bigger problem was to try and cross a ac delco number with another ac delco number. I think I found the plug I am going to try next. I had went two ranges colder to start with, but after looking at the plugs I wanted to try just going one heat range colder. from looking around I will have to go two ranges colder. I had champion plugs in there. ( I was told they wokred well) but I want to try ac delco as I have always used them in the past. I could not find a listing for my truck that would give me a plug that was a copper plug. I am going to try a r42lts delco. I wanted a r43lts. just have to see if it works. I change the plugs 3 times a year anyway. thanks for the help.
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Old 07-01-2010, 01:24 PM
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Why do you change plugs 3X/yr?
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Old 07-01-2010, 01:34 PM
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I really only need to change once or twice a year, but I seem to do it about three times. the truck burns the plugs up. high spark plus boost makes them not last that long. plus they are a standard copper plug. last I checked in 2,000 miles I burned .005 off the plug. that made my gap.042
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41985, ac, chevy, colder, delco, gap, platinum, plug, plugs, prong, r42lts, r43lts, replaced, replacements, seat, spark, tapered, year

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