On my new heads(Pro Toplines) They reccomend a champion v59c plug. That crossed to an Autolite AR133 which is their Race Plug.Special order at the parts store, PITA! It has a cut electrode. Anyone know anything about em? Can i use a standard plug.I got them already so i'll try them, but if i need to experiment with the heat range its a pain to order them and they're not cheap. And how do you gap a plug with a cut electrode?

I run C63CX Champion race plugs with the cut back electrode. I have to run them for piston dome clearance reasons. They are also quite expensive and not available anywhere locally. My C63's are a bit cold for street use, but I don't have trouble with them fouling. The 59's are even colder. These plugs are more difficult to gap. The electrode is much harder to bend and you will destroy normal gapping tools because they bend first. I carefully use a screwdriver to set the gap and then check it with one of the circular gapping gauges inserted at an angle all the way to the base of the electrode.

How do i determine which 'regular' plug would work?

You'll need to find a plug with the same reach, thread diameter, and heat range. I would recommend contacting Pro Topline and ask why they say to use the race plug. It's safest to start with the plug they say to use. What's the chamber size and intended application for the heads? I'm thinking there is a reason they are saying to use the cut electrode plug. It's better to start colder and go progressively hotter if you need to.

I forgot to mention in my last post that, in addition to reach and thread diameter, the replacement plug will need to have the same seat type (either tapered or flat/gasketed).

Thanks for the info. Heres the heads im using.
http://www.protopline.com/223400080a.asp

my pro topline heads (220 lightning, 64cc) reccomended a c57c champion, but i'm not a huge champion fan, so i cross referenced them into a ngk v power, also a racing plug, but the car is pushing the boundries of street car anyway, so i'm o.k. with the race plugs. the ngk are only about a 1.50 a plug, not bad imo. i just order a couple of extra sets. but i would think with yours you could look for a correct seat, reach, and thread dia. as mentioned earlier, in a more common plug and be o.k. just be sure its the correct plug, and i think calling pro topline is also a good suggestion. good luck graemlins/thumbsup.gif

We just had this same issue with a friends 327 and new Pro Toplines. The plug is a standard 14mm 3/4" reach type, so there are a LOT of different plugs to choose from.

We tried the Champion race plugs (actually the Autolight equivalent) and they gas fouled very quickly when we fired the engine (its cold here!). But the plug is a cold plug so we are now trying a hotter plug. I know a guy that runs this plug in his low 8 second 13:1 BBC Camaro with 300 N2O shot. Its a cold plug.

Try AC Delco FR3LS. I compared the Delco side by side to that Autolight race plug and they are identical except that the Delco has a full electrode and is several steps hotter.

ps. If you try a different plug make sure you compare them side by side so you know they will clear your pistons and seat correctly. Pro Topline recommended the C57C plugs for our 200cc straight plug aluminum heads.

ditto, eric, the ngk plugs that crossed to the c57c was a bit too cold for my motor as well, 11.6:1 compression. i just upped the heat range a couple and all seems well. the race plugs in general are colder, it seems, so thats another good reason to look into other plugs. and eric, yeah its funny, my buddy w/ a low 7 second 632 shoebox runs the same ngk that crossed from the c57c :eek: , they must want you to start out plenty cold, i guess.