Part# for RapidFire Plugs

[95SleeperAcheiva]

I ran #4's in my 1992 Z-34. But I was running 116 octane, 150 shot of dope, no emissions, and full port and polishing with a ice box on the fuel lines and (naturally aspirated) ice box (spearco) to chill the air in tropical heat race track conditions. worked great. Also match that with mallory wires, you'll have to make them yourself from a universal kit. When I did that I was apart of a fairly large race team, and we had bought 1 set of every spark plug wire in the summit catalog, the mallory's ohm'd out the best.

[Identity Crisis]

Got the plugs. Took a look at them and they dont look like rapid fires at all. I have an older set from my 3.1 and they have divits all around the anode and these new ones are just a fine point and look like platinums.

I mentioned it to the sales guy and he said that rapid fires changed up. I said that how can it be a rapid fire with out the divits cause my understanding is that is what made it a rapid fire plug.

I bought them anyway. #10 and if anyone ever wants the GM Part number let me know cause it took 4 days of talking back and forth to just find the right plugs.

What is everyone setting these to? Stock is .060 but I am thinking maybe .045. Opinions/suggestions.

Thanks

[pwmin]

they redesigned the rapid fires. they have a different platinum electrode now...lame. 8s are about 1 step colder than 12s, i think.

[95SleeperAcheiva]

Fine tip ussually means iridium. And they should be pregapped, with that real fine tip you will crush it very easily, leave it be. If you were NOS'd, blown, turbo'ed, and dragging for consistancey, in the neighbor hood of being worried about .005 +/- sec) then I would say to adjust their gap. Otherwise, street app, don't touch it.

[bve32k]

RapidFire 8's come pregapped @ .035. Here is the GM Part # for it. 25171347

Now I was looking at getting these. Should they be regapped to .045 or be left alone?

[3400beretta]

I put Rapidfire 8's in my 3.4. The lower the number, colder the plug.

This is not the case with the rapidfire numbers. Number 12's are equivilent to R42LTSM, which are the coldest you can get for our engines, as far as I know. #8's are R42LTS which apparently doesn't have the "special design" electrode, whatever that means. #6's are R44LTSM equivilent, so that throws your theory out the window. #4's are R43XLS, actually 1 heat range hotter then 12s or 8s, and not designed for our engines at all.

[93Oldsdroptop]

This is not the case with the rapidfire numbers. Number 12's are equivilent to R42LTSM, which are the coldest you can get for our engines, as far as I know. #8's are R42LTS which apparently doesn't have the "special design" electrode, whatever that means. #6's are R44LTSM equivilent, so that throws your theory out the window. #4's are R43XLS, actually 1 heat range hotter then 12s or 8s, and not designed for our engines at all.

OK, I stand corrected.

[Identity Crisis]

Still have not put them in yet. Waiting to buy some plug wires. Any suggestions? Other then Magnacore.

[pwmin]

taylor makes 8.0 and 8.2 mm wires in black, red, or blue (others?) for 91-95 engines for less than magnecor.

[93Oldsdroptop]

The stock Delco wires are plenty good for the LQ-1. I'd stick with those.

[Identity Crisis]

Ok 95 V6 3.4L (X) GRAND PRIX 8mm-74X42 8.2mm84X42

THese are the part #s for the 95 but I cant find anything for my 96GTP.

Is there a major difference between the 95 and 96 3.4X Engines?

I just checked with my supplier and I can have these ones for $100

[bve32k]

The 95 spark plug wires have the long extension on the rear ones. Makes it easier for changing. You can't put those on the 96 engine. The UIM takes over the whole back of the engine where the plug wires go into.

[Identity Crisis]

God Damn it!