which plugs should i run on a procharged 330hp 7.4L
 

hey guys...

quick question about plugs

i'm putting a procharger on my 330hp 7.4L and was wondering which plugs you guys would run.

thanks.
Ned

What boost pressure?

If below 3, then try one size colder.
If above 3, try two sizes colder.

If you can't keep a clean plug at cruise, then go up one hotter.

boost pressure
 

5lbs w/ an intercooler

Running stock plugs here...no problems yet...was told hotter is a no no.454 built...9lbs.

JimV told me to run NGK UR-5 plugs. I'll let you know how they look after a couple hours of runtime.

I'm running those same plugs in my 525SC. Ran them for 50hrs last year and they still look fine. They are the same heat range as an AC mr41's and have an extended tip.

your putting a charger on a stock 330,you do know that thing has small rods and cast pistons.....you should at least have a 365 magnum for one of those!

Hi, are you stoned or just stupid?:confused: When asking how to build more power 75% of the people on here sugjust a intercooled super charger. Have you ever taken a 454 apart with your one 2 hands and seen how big the "SMALL RODS" real are?

I don't think he's referring to the small rods, but the 3/8" bolts. Not to mention the fact that the cast pistons will melt if not explode when exposed to a slight bit of detonation for any extended period of time.

Go with cold one!!!

I melted one last season and did all sort of damage to the cylinder and one of the valves. At the time I was only running under around 3-4 pounds of boost (4400-4500rpm). You know what kind of damage detonation can cause as those rpms??? Damage that can cost a **** load of money to fix..

I currently run a V-power R5674-8

It's an extended tip, which I don't think is recommended for a blower motor to begin with, but no more problems so far(about 75hours). I just put new ones in it.

Good Luck.

I do see were you are comming from but posts like the one from Offshore Addiction dont help any one. This is not this guys first post about his project and it is not a what do you think question. He is completly aware of what might or could happen that is why he askes a question like this from people with simular experences and some thoughts and ideas as he finishes it up. Rag's

Really the only bad part for this project in my experance are the
cast pistons I've done several with 3/8 rods and cast crank as its rpm's that kill them not boost (with in reason )
T R W and speed pro had a piston that was very cheap for blowers in std,30,,60,over and I swapped them for the cast piston for next to nothing ,and they even have reverse deflector
domes !! They were turbo pistons I think ,no big deal they don't care blower or turbo ,,their cheap !!
Then you will have a reasonable 5 to 6 lbs blower motor cheap
use a 280 comp flat tappet cam on a 114 ,andput some extra clerance on the wrist pins
From here you can go as mild or wild as you want this is a good starter motor
The 330 with cast is tough to do with cast pistons I agree :D :chimp:

you guys are killin me here.

i know the 330 hp motor is not the ideal motor to put procharger on. i've know a few people who have run 5 lbs w/ an innercoler and haven't had any problems. i've got an EGT gauge and plan on checking the plugs on a regular basis. all i want to know is what plugs other people have run on similar applications so i don't run them to hot.

thanks.
Ned

Plugs won't do it ! run a step or two colder ,no big deal

The 330 is a great motor if you run it within it's limitations. Use your head when you're out there and you'll be fine.