Correct NGK plugs?

[FLAT BOOSTED]

I just bought a TTA and I'm having a hard time figure out which are the correct plugs for our cars. I know I want NGK but cant seem to cross reference the exact part #. There seem to be variations.
Thanks in advance,
Dave

 

[dvernst]

I found this chart. Does this help? http://www.sparkplug-crossreference.com/convert/AC_DELCO/R42LTS

 

[dvernst]

On pump gas, or race gas I never had a problem with the stock AC Delco R42LTS.

 

[FLAT BOOSTED]

Thanks for the replies. The cross reference chart helped alot.
Thanks,
Dave

 

[Scott89TTA]

On pump gas, or race gas I never had a problem with the stock AC Delco R42LTS.

Same here...all I have ever run in my car the last 11 years and mostly at 26 psi with Alky. Had to tighten the gap up after going from 22 to 26 psi to stop from blowing out spark.

 

[tta983]

I run the AC Delco 42 LTS and gaped at .30 and it works great for me.

 

[gusszgs]

I run NGK-UR5's Gap .o30" 24 psi...... decent so far

 

[turboponcho89]

Anybody using platinum plugs without issues? Or any other type metal besides stock.

 

[dvernst]

On e85 I've been running the Autolite racing plug. Ar474, 473, and 472.