Which spark plug should I use?
Thread Starter
Melting Slicks
Joined: Dec 2006
Posts: 2,483
Likes: 1
From: Bay Area CA
Which spark plug should I use?
Folks,
1969 corvette with a GM crate HT 502 motor.
MSD ignition and distributor with 8mm wires.
Cast iron heads.
What type/heat range spark plugs are recommended?
I am getting confusing messages from the internet
GM Performance parts tech specs says - AC Delco R43T
Everywhere else on the internet - AC Delco CR43TS
Are there much difference between these two plugs?
1969 corvette with a GM crate HT 502 motor.
MSD ignition and distributor with 8mm wires.
Cast iron heads.
What type/heat range spark plugs are recommended?
I am getting confusing messages from the internet
GM Performance parts tech specs says - AC Delco R43T
Everywhere else on the internet - AC Delco CR43TS
Are there much difference between these two plugs?
Last edited by rajsid; Jan 13, 2010 at 08:34 PM.
Racer
Joined: Dec 2009
Posts: 380
Likes: 0
From: Glendale AZ
They're both the same plug, however a CR43TS has an extended tip (it protrudes farther into the cylinder)
There's differing opinion on both so it comes down to preference. Personally I'd stick with the R43T.
Here's a chart for reference showing you how to decode the plugs:
http://www.acdelco.com/parts/sparkpl...tification.jsp
There's differing opinion on both so it comes down to preference. Personally I'd stick with the R43T.
Here's a chart for reference showing you how to decode the plugs:
http://www.acdelco.com/parts/sparkpl...tification.jsp
Race Director
Joined: Apr 2000
Posts: 17,676
Likes: 201
From: Who says "Nothing is impossible" ? I've been doing nothing for years.
What do the specifications for that particular motor call for ? If it is a crate motor that is still for sale you should be able to find these specs.
If not what plugs were in the motor when you got it ? Extended tip on a motor with pistons not designed for extended tip could be disastrous, however if the specifications for that motor call for an extended tip plug that is the plug I would use
If not what plugs were in the motor when you got it ? Extended tip on a motor with pistons not designed for extended tip could be disastrous, however if the specifications for that motor call for an extended tip plug that is the plug I would use
Thread Starter
Melting Slicks
Joined: Dec 2006
Posts: 2,483
Likes: 1
From: Bay Area CA
They're both the same plug, however a CR43TS has an extended tip (it protrudes farther into the cylinder)
There's differing opinion on both so it comes down to preference. Personally I'd stick with the R43T.
Here's a chart for reference showing you how to decode the plugs:
http://www.acdelco.com/parts/sparkpl...tification.jsp
There's differing opinion on both so it comes down to preference. Personally I'd stick with the R43T.
Here's a chart for reference showing you how to decode the plugs:
http://www.acdelco.com/parts/sparkpl...tification.jsp
Actually the GM Performance parts website says R43T
http://www.gmperformanceparts.com/_r...Long_Block.pdf
Thread Starter
Melting Slicks
Joined: Dec 2006
Posts: 2,483
Likes: 1
From: Bay Area CA
I guess I will stick with the R43T.
