I have one of the gm goodwrench 350/290hp crate motors in my '78 malibu classic. I want a little extra power, and I'm getting ready to finally put some headers on. My main question here is about spark plugs. My dad had a 5.0 91 mustang, and he bought brand new splitfire spark plugs. He got into an accident and the car is trash. He spent some ridiculous amount on the spark plugs, so I wanted to take them out and get his money's worth by putting them into my engine. So far, I have had no problems using the bosch platinum plugs I have been using since I dropped the engine in. Is there any way to know if I would be fine using these splitfire plugs? Too much spark for this engine? Are they designed more for high compression heads or does it matter? I was just hoping I could REALLY feel a big jump in power by putting the headers and plugs on at the same time. Give myself some big difference in power to feel so I would know the money was well spent. any ideas on this?

I have one of the gm goodwrench 350/290hp crate motors in my '78 malibu classic. I want a little extra power, and I'm getting ready to finally put some headers on. My main question here is about spark plugs. My dad had a 5.0 91 mustang, and he bought brand new splitfire spark plugs. He got into an accident and the car is trash. He spent some ridiculous amount on the spark plugs, so I wanted to take them out and get his money's worth by putting them into my engine. So far, I have had no problems using the bosch platinum plugs I have been using since I dropped the engine in. Is there any way to know if I would be fine using these splitfire plugs? Too much spark for this engine? Are they designed more for high compression heads or does it matter? I was just hoping I could REALLY feel a big jump in power by putting the headers and plugs on at the same time. Give myself some big difference in power to feel so I would know the money was well spent. any ideas on this?
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I don't have a clue if they will interchange but I can tell you that the trick of the month sparkplug is a friggin joke :(

There is no power to be had in these fancy hi dollar plugs what so ever.
Unless of course you take into account your wallet will be lighter,,
This will be the only performance gain you will see :D

If your car runs better with them it is because it needed a damn tune-up, not because the plug has more than one place for the spark to go.

Instead of falling into the advertising hype stop & think about what the plugs job is,,
Once you ignite the fuel the plugs job is done & more spark does nothing.

Mike

We saw some power gains on the plugs we used in the Vortec heads as we went form the standard plug the Autolite AR-473 plug and it picked the numbers up on the dyno and other shops we work with could not believe the differance either when thay tried it.

I doubt on that stock engine there be any plug that would really help that out.

So it couldn't hurt the engine to use them, right? I know that these things helped the mustang. We went with bosch plantinum on it, and POOT. Put platinum 4 in it, and POOT. Splitfire made the damn thing run like a beast til someone t-boned it. I just want to make sure it's not too hot for mine. As long as the car runs good, I'll be happy. I'm not expecting to shave a second off the quarter mile cuz of the plugs, but I sure as hell don't want to add a second to it either. Should I be safe?

I'd take a regular extended reach, (if it will fit w/o hitting the piston top), resistor type plug and cut the upper "ground" electrode half back just like a lawnmower plug and go!!

Check out a cheap lawnmower plug and you will see just what I mean!!

Same deal!!

pdq67

PS., and use REAL wire sparkplug wires!!

I've decided I'll just try the splitfire since I already have them and can't return them and let you all know how they work.

But on a side note, I learned about this the other day where I work. We do a lot of commerical work for the big automotive companies like toyota and gm and such. In the process, we do work of our own to see if we can gain even more business. One of the things we are working on are alternatives to spark plugs. The alternative is actually a focused laser beam, or simply a "heat beam". I couldn't tell you if other places are messing with this technology or if we are one of the first, but it is awesome. They showed video of the explosion of a spark plug with fuel slowed down to some ridiculous speed, and it took what looked like 10 zaps to even get something to light, and it was this small little nothing of a flame. Then they showed the laser, which they can aim at the best position within the cylinder to ignite the fuel. Good God...it looked like an atom bomb went off in there. I've seen the future of internal combustion engines, and that was it. A simple change of plugs to lasers, and the car was running at almost 100% efficiency. Ridiculous gas mileage, ridiculous power. They'll be using that technology with the formula cars way before I bet any of us get to actually drive a car with that stuff.

Anyway, just thought I'd share that with you. I suppose it wasn't much of a secret if they shared it with me.