AC DELCO CR42ts or CR43ts?

[87ttypeV8]

well what plug would YOU recommend for my combo?

should be in profile but...
-ported heads and intake
-206/206 comp cams
-3" air intake to turbo with aluminum inlet bell 9" kn
-3" THDP and 3" atr Single shot exhaust
-underdrive pulleys, plenum spacer
few other little things but this is the most of it

my car i would imagine could be a 12 second car and just wondering what i should run... i cureently have in CR43s and just wondering if the 42s will help any... i get a little knock in high rpms and dont know if spark plugs could be cluprit... have 110 octane with ONLY 19 psi

and if you prefer a brand of plugs other than AC DELCO let me know!

 

[Otto J]

With 19#s and 110 octane, you either have one crazy timing chip, The car is to lean, or its just false knock.
What chip,injectors and fuel pump do you have?
Just did a car tonight with the new 60#ers and a Commander chip from Mike Licht and the thing runs incredible and no knock at 19#s on 93 octane

 

[buickboy]

AC CR43TS with a tight .035 gap. Works for a high ten car.
Mitch

 

[Renthorin]

Cars running 12.99-13.50 seconds or faster should use R43TS or CR43TS plugs (one heat range colder) and 12.00 and faster cars should use AC R42TS or CR42TS. The CR designated plugs have a heavier electrode (the "C" stands for "Commercial"), but are otherwise the same as the R42TS plugs.


So sayeth Gnttype

 

[TR Custom Parts]

So what do you use when you are hovering on breaking into the 11's? I am currently running 12.20's with the AC43TS plugs. Using alky and 24lbs of boost but only race once a year if I am lucky.

Anyone read the article in the latest GSCA newsletter about using the T series plugs vs the TS. Something about the shorter electrode being better.

 

[Renthorin]

I admit.... I don't use AC plugs right now.....

I jumped on the NGK UR5 bandwagon. Don't really notice any difference.

When I used AC plugs I ran the CR42TS

 

[XLR8]

I use the 43's gaped at .034 and run 11's with 26# of boost.

 

[strikeeagle]

IME, any of the plugs mentioned would be a good choice.

 

[87ttypeV8]

yeah i thought so... just didnt know if anyone had more preference or experiences than gnttype did... always like alot of input i guess my 43s will stay for a little longer!