78 replies to this topic

[KeavDog]

So what is the read on those plugs - clearly fouled but what caused it? To rich?

I've got a set of the NGK 1 step colder iridium plugs. What should I gap them at given an 09 5.7 stock block with a maggie @ 8 PSI?

Thanks,
John

[rdrdr90]

The material isnt as important as the heat range.

Thanks Andy! I was going to to 1 step colder, just wasn't sure if copper or iridium was better or even mattered.

[Speedy]

So what is the read on those plugs - clearly fouled but what caused it? To rich?

I've got a set of the NGK 1 step colder iridium plugs. What should I gap them at given an 09 5.7 stock block with a maggie @ 8 PSI?

Thanks,
John

.032 - .034 for that boost

Make sure you use the proper gapping tool for iridiums. Info on my site of course.

[Andy@PWR]

What he said

[KeavDog]

Gracias. Already watched the video
Got the tools. Love the magnetic plug socket.

[Speedy]

Yeah, it's a life saver in these cars with the deep wells.

[Boatman]

My litlle socket has the rubber insert. I only tried one so far it worked fine. I waited till I got a wobble extension before I di them. Some of them look like they could be a bitch W/O the wobbler.

[BayouTiger]

Rubber insert works fine for me to. And yes the wobbler helps a LOT! A tilting head (?) ratchet helps a bunch as well.

[Boatman]

.032 - .034 for that boost

Make sure you use the proper gapping tool for iridiums. Info on my site of course.

Yeah not like I used to do back in the day. Stick the flat Gap in and Smack the plug That would not work out so well with these little treasures.

[HemiSam]

Money well spent if you're gapping 16 plugs...

http://www.summitrac...rts/SUM-900313/

I agree it's the heat range, Sean. Hell, there's nothing wrong with copper plugs if you can find them in the right heat range. I'm also not bothered by having used a 6.1 tapered seat plug on the Eagle heads (i.e. not a crush washer) as long as you keep using them...hundreds have had zero issues doing so. I'm using the Brisks simply because of compound boosting (blower and spray) and the blower at 12-13 psi at peak while spraying a long way. Nitrous Outlet can give you great advice on heat range. I never got my head around why the 5.7 HEMI's plugs were a range hotter than the 6.1's of the same year so my only question would be do you step down 1 or two ranges from the stock 5.7 plugs for your application.

HemiSam

[rdrdr90]

I went with the NGK 7787's....one heat range colder and copper.

[HemiSam]

You'll be fine and the price is right. Just make sure you get good advice on the gap and take a good caliper to whatever gapping tool you use. And no, I'm not referring to Jim...

HemiSam

[BayouTiger]

That's a neat tool. I've always just used my trusty Craftsman keychain tool!

[rdrdr90]

@ Sam! I've got my good ole Craftsman spark plug gap and feeler guage tool that my dad gave me when I was 8 or nine......gapped many a set of points and even more plugs with this bad boy...

[Speedy]

I got these and love them.

http://www.amazon.co...5161&sr=8-3



I use that same exact tool Sean, although mine's a little...ummmm cleaner

[rdrdr90]

^^^^

The feeler gauges are way rusty...haven't used them in a while. I'm just glad I've had it for almost 40 years.

[BayouTiger]

I got one of those too! I bet mine look more like Sean's than J's. I think it right there in the drawer next to my timing light!

[Roomraider]

Now that we have been porting 6.4L heads left and right, I have a ton of 6.4L spark plugs in a box and I wanted to determine how they compared. Here is that part number.
NGK-LZTR6AP-11EG

The 6.4L plug is the same heat range as the 2315 plug listed above which makes it a good plug for 500rwhp applications. The differences are that the 6.4L plug is platinum and not iridium, it comes gapped at .044" instead of .052" like the 2315 plug above and it has a 10k ohm resistor instead of a 5k ohm resistor. Evidently 5k is industry standard but 10k is supposed to increase plug life. 
 

So if this works for the 6.1, then which iridium plug & gap should be used for a blown 6.4?

[BayouTiger]

I wish I could find the NGK's around here. No one stocks them in anything other than the stock ranges. 

[Pat McCrotch]

Gotta ask if there is any proven benefit with any type of indexing as in enhancing flame front ? I do know a 440-6PAK I once had the reigns of would without question run measurably better (hundredths) (no dyno runs) with the gap a few degrees towards the exhaust vs a random 8 plug change. No boost, 1 non centered plug, low power in comparison to some of these things but still my grey matter is a wondering about their orientation and effect if any ?