Hey guys.

I was just wondering if you can tell me what would be a good plug and what heat range. I have been told I was running to hot of a plug. I was also thinking of going to autolites or NGKs.

I am not wanting to spend $4 on each plug like AC rapids or anything like that. Just wondering if autolites or NGK would work as good if not better and what heat range do I need.

Thanks
-Terry-

 

The heat range of the plug only needs to be hot enough to keep deposits from forming. The tip temperature needs to be around 900*. A lot depends on what heat range you need. Too cold of a plug and it fouls up. Too hot and the tip burns off.

I ran AC R43TS plugs for a few years until I went to alcohol and 13:1 compression. I couldn't use them any more because the pistons were hitting the plugs. I run NGK race plugs now. I use the -7 heat range. They don't cost any more than a normal plug.

Plugs like rapid fire, Bosch +4, splitfire etc are just marketing gimmicks. they don't do any better than any other plug. If you want a plug that lasts a long time so you don't have to regularly check the plug gap, buy some platinum plugs. They'll cost you a bit more but they'll last longer.

Your best choice is to install the heat range plug that your owners manual suggests. When you go plug shopping, look through the plug listings for your car. They'll list what's required. Buy the plug make that you want that cross references to the original required plug.

 

I've run NGK UR4's in a combo similiar to that for years ( Previous car ). Worked great. Only plugs that have ever worked worth a hoot in ANY of my SBc's have been NGK's or AC Delco's.

 

Try some AC R44TS or another eqivalent brand that crosses over off that p/n. The R45TS are great for stock low compression motors since they're hotter and the R43TS are good for high compression engines since they're colder, your kinda in the middle with a 10.0:1 compression so R44TS it may be.

 

The AC Rapidfires cover two or three heatranges, so they're not a gimmick after all!!
(in fact they're three plugs in one, think about that when laying under the car, sweating to get the old plugs out and new ones in...)