Correct spark plug

[Gary G.]

I have a question regarding the 75 L 48 engine. I currently use the R44TX plug, which is for the HEI ignition. What plug is one range hotter? Some people locally told me that the R44TX is obsolete, is this so? I still see it listed in many AC catalogs. If it is not available, what plug can be substituted?

Thank you for any information.

[Joe L.]

Re: Correct spark plug

I have a question regarding the 75 L 48 engine. I currently use the R44TX plug, which is for the HEI ignition. What plug is one range hotter? Some people locally told me that the R44TX is obsolete, is this so? I still see it listed in many AC catalogs. If it is not available, what plug can be substituted?

Thank you for any information.

Gary-----


The AC R44TX is the correct spark plug for your application. It is also known as GM #5613869. It's no longer available through the GM parts system but it is available through the Delco parts system.

Want one range hotter? No problem. Use an R45TX, aka GM #5614252.

[Gary G.]

Re: Correct spark plug

Thank you Joe.