What spark plugs do you recommend?

Iam also looking into an MSD box in the near future...

also what kind of cap should i be looking into?
am i better off with a HEI or an extrenal coil (example: MSN blaster 2)
does anyone know the MSD part numbers?

thanks.

 

What other modifications are done? You'll see better improvements upgrading other things before you go to a 6a or 6al box. Do your exhaust if you haven't already.

 

I will be doing full exhaust (inc headers) next week..shop said 3" is too big and i will have no backpressure...

what other mods should i do?

im looking for a good quality plug that will also work with the box.

 

Here is all you need to know about back pressure and why you don't want any: https://www.thirdgen.org/techbb2/sho...t=backpressure

Got the link from here: https://www.thirdgen.org/forums/tpi/...faq-index.html

As far as plugs go, any high quality (not no-name) single ground strap (none of those +4 or +2, they're just a marketing gimmic) will do you just fine.

 

In my truck, which has plugs that are hard to access, I use platinum plugs just because I don't have to change them for a long time.

In the race car I prefer an NGK race plug. The internal design is a little different than a normal plug but the price is about the same and externally they look like a normal plug.

I also don't recommend gimmick plugs. Claiming more HP with a plug swap doesn't mean much if the old plugs were worn out and any new plugs will give better results.

 

Just get the plain jane Delco plugs.

 

Right on, everytime. Delco in GM, Motorcrap in Ford, NGK and the like on the rice.

 

As long as it is a RapidFire good to go.

 

NGK 9's are the win.

 

Im just looking for a great quality plug that will work well with the MSD boxes and without..

thanks

 

A/C Delco plugs....

 

as was mentioned, platinum plugs aren't great, they're actually worse for power, but they last longer. Our cars are easy to get to the plugs, so it's not worth using these.
Iridium plugs are very expensive, and only really produce a power gain in HIGH compression motors, or forced induction. You can open up the gap more with these and gain the power back.

Copper plugs, AC delcos, are the best you can get. Change them at regular intervals, and be happy More spark power (msd box, bigger coil, etc) you can open up the gap and get a bit more power. If no aftermarket ignition, keep your gap low (stock).

 

so your saying AC are the best bet?

 

I've never seen anyone complain about the Delco copper cores. They're about a buck a piece, so when you upgrade to a new ignition, they're cheap enough to replace with whatever.

 

I'm using an Autolite 63 right now (mainly because it is cheap, copper core, and was one of the few that fit my head at Wal-Mart...) but a few people have told me to stay away from Autolite. I defenitly don't want to spend much on plugs; plugs are plugs, especially when you foul them out every motor startup trying to tune the thing

Can anyone cross reference the Autolite 63 with AC Delco? I'd prefer AC Delco if I could.

 

I like to put Denso Iridiums in high mileage engines and for those like my L98 where the plugs are hard to get to. They last really long, burn cleaner if there's any oil and hold their gap well.

There's lots of bad press about using Platinums, especially if you don't have a hot enough ignition system, so be careful- they do tend to last longer. No Champions or Split Fires or Accel products of ANY kind....
Nitro

 

Any quality copper core plug would be what you want. Certainly not a Bosch platinum (any) with the MSD, they get too hot. You want the least inline resistance when using an aftermarket ignition. (Don't get me started on the alleged 'low resistance' crapola wires MSD and others sell.)

Any of the expensive metal plugs are typically not needed on these cars (particularly with a 'hot' ignition set-up) unless you plan on neglecting your tune up interval. As was mentioned, these plugs are pretty easy to get to.

If you want to 'get a little extra' index the plugs and cut back the strap halfway into the center electrode.

 

Ill be running el-cheapo delco plugs. the things are a dime a dozzen so if i gotta replace them every few months i couldnt really care less.