Spark plugs

[STDog]

Rebuild a 1970 472. Stock ignition and carb.
And recomendations on plugs?

I though about trying the platinum, like the Bosch Platinum2, but can not find a direct cross.

Stock is Delco R44XLS (.035" gap), Autolite 66.

I did see a cross for a '76 500, but it used HEI, and a 0.060" gap originally.

So how do I find a good match? What are the trade offs?

[cadzu]

imo i would stick with the ac-delcos i've never had any problems with them.
plus you'll get a better burn with a cooper plug.platinum runs cooler that's why they last longer but dont burn as good.

[Gorf]

I have had really good luck with Bosch platinums. I have also run split-fires in years past. Don't seem to see them much anymore. They really paid off with high-fire ignition systems like MSD.

[cadillac512]

I have R44XLS in the '70 472 in the malibu and in both 500's I race the T with. They have been perfect.
Terry

[cj2/500]

I always run ac plugs in my cads. In fact, I run factory plugs in everything even remotely stock. not as important on older cars as it is newer ones though. Wanna pi** off a 4.9 caddy? :evil: try a set of multiple electrode platinum plugs :!: What a p.i.t.a. to do a set of those twice :!: :oops:

[Caddycarlo]

if you are going to stay with the points ignition you need to stay away from platinum plugs as they are harder to fire and can cause arcing of the ponts and short point and condensor life ...... if you are looking for a better spark you can add a msd box or go to hei or some other electronic ignition ........ also non carbon core wires ......