I need a new set of plugs and want to run cooler ones. What brand and serial no. is best?
I up graded my ignition and just installed a carter fuel pump with more psi. I just need a good set of plugs, retard my timing, and then giver s<x>hit time. What plugs are you using???

 

Um cold is the bbest that i cnan answer.

 

That depends on what you're starting with. Assuming that we're talking about something that started with AC 43 heat range plugs (something like 41-943, CR43TS or similar) like my 350 TPI, my LT1, the 350 TBI in my truck... LS1's... (may not be the case for 305's, my crossfire uses a 45 heat range...). I've had good luck with NGK TR6's (old part #, any decent import parts place should be able to find them by that). These are 2 heat ranges cooler. I actually gained a little ET installing those over some brand new normal heat range plugs.

They are the same as Autolite's 103's, although most using autolite's are running 104's which are about half an AC heat range warmer then the 103's. I've had problems with autolites in my '83 and my '97, in both cases I traced it down to an insulator that cracked without being touched in less then 1000miles. OTOH, they're working fine i my brother's ford...

BTW, these work fine in my formula and LT1, but I suspect that they’d be too cool and eventually foul in my truck…

 

check out www.zex.com

they sell plugs specifically for nitrous, blower, setups that are colder.

 

1- they specifically list them as for 'sport compacts,' not sure but last time I checked an f-body isn't one.

2- look at the design, they say that they are cooler running, but if you look at the insulator center electrode configuration there, unless they did something drastically different in the shell they're gonna run hot...

 

where does it say for sport-compacts only?

they sell them in packages of 4, 6 or 8.

know a lot of 8 cylinder compacts?

or do you mean the site is geared toward sport compacts?
because they sell kits for lt1's and fords as well, so i'd assume the plugs they offer are for all types. please correct me if i'm wrong.

not sure about the plugs themselves either, this is what i saw.

"They have special nickel ground electrodes with a copper core center for excellent heat dissipation which improves Nitrous, Turbo & Supercharged Performance. These spark plugs have a triple-ground electrode for more efficient combustion and the heat range is especially designed for Nitrous, Turbo & Supercharged performance vehicles"

 

I downloaded the catalog page off their site. I'm kinda bandwidth challenged here so I'm not going to go looking for it again.

 

Dude, first just go to your nearest competent automotive supply store and have them cross reference your existing plugs to NGK or what other brand you like. Next, solidly determine how much gas NO you intend to add and for every 75 hp you intend to make go one heat range cooler. I've been doing this for years and have never had a problem. Though, all of this assumes you know how to read your plugs to find the right ones for your engine before adding gas!!!! Peace!!!!!!

 

say no to platinum or "fad" plugs (grooved, splitfire, multi-electrode), or any other crap that has thin little parts that can heat up and cause a glowplug style detonation. our dyno shows the autolite race non resistor as the king in a plug shootout.