I know sparkplugs have been discussed a thousand times, but I am looking for something a little more application specific.

Bone stock 440-6 in a '69 RR with an automatic. Not taken to the strip, I just like cruising around in it. I have RJ12YC's in it now, not sure I like them. They look OK so far, though the car runs a little rich and I think I can do better with plug selection. Timing is "mainstream" at 18 initial and 36 full, I do not have any detonation signs.

As a side comment, I have two 383's that I switched to the hotter RJ14YC's with excellent results (cleaner smell out the tail, hold up well when driving around, nice tan color).

What do you all run in a pure stock, street only, 440-6????

Autolite 84's or 85's are ok.

Bosch Platniums.......run'em in sm blk 6 paks and B blk 6pak, and Hemis.....if you ain't got the ignition "firepower" to run these, you won't like them,.......but if you have a "hot" ignition, these plugs perform great!

If you have Boschs that run buy a lottery ticket.Ive pulled hndreds from cars because they are crap period.Ive always run Autolites in my old stuff.I have them in my aluminum heads but will try NGKs as everyone says they run better.Rocky

The rj12-Y's are actually hotter than the factory plug already. (j11-y). going to the 14's is quite a few steps asay from factory. sure, they stay cleaner if you're doing a lot of low speed cruising, but would be prone to detonation. I'm using Mopar p-34 plugs (I think that's the number, its a j-11Y repackaged). Bought about 10 sets at a swap meet a few years back for $5 a set.

Accel 437S need them to clear my headers. Perform well.

Autolite 74's. Ron

Call summit and get a set of ngk v-groove, best plug you can get.

Autolite 85's

I have a 70 RR with a 440

I have NGK XR5s - the stock number is 3332 gapped at .40

also have Accel cap and rotor

and Accel Extreme spark plug wires (9004) - they are 8mm and black