I have a 1994 gt that i just out p heads on and a f 303 cam i was wondering what plug to run. If anyone can help id appreciate it. Thanks Jeff

 

autolite 25s

 

I was looking at those, are they really that good of a plug?

 

i have p heads off of a 2000 exploder the autolite 25's wont fit those heads the explorer calls for 764's but im not sure if thats the right heat range

 

I have yet to find anything better. I've tried iridium, platinum +2s, platinum +4s... in the end I find that nothing seems to be able to beat the autolites. With the Bosch +2 and +4 plugs, the spark qould literally extinguish under boost. As you can imagine, you can't make too much power when your spark can't ignite the mixture.

If naturally aspirated with a few mods, go with the 25s. With forced induction / nitrous make it a step or two colder.

 

What are you using for headers? That may be your problem right there.

 

i have bbk long tubes but the thread pattern is different between the newer heads and the older ones