Author Topic: What spark plugs are you using in your 340? (Read 1464 times)

Katfish · « **on:** September 11, 2007 - 09:19:56 PM »

Any recommendations for spark plugs for a 340, brand and heat range?

Thx

vinb · « **Reply #1 on:** September 11, 2007 - 09:22:25 PM »

Champion- RN-9-YC or NGK- BP8ES....

GoodysGotaCuda · « **Reply #2 on:** September 11, 2007 - 09:23:35 PM »

Autolite 65s are stock. I run Autolite 64s in my 318, i have a little higher comp, 9.8.

IMNCARN82 · « **Reply #3 on:** September 11, 2007 - 11:10:17 PM »

I prefer the NGK's...

Chryco Psycho · « **Reply #4 on:** September 12, 2007 - 02:04:45 AM »

Champ RN12YC typically gapped at .040

Katfish · « **Reply #5 on:** September 12, 2007 - 05:35:01 AM »

Champ RN12YC typically gapped at .040

Does gapping them larger make them work like a cooler plug?

Thx

Chryco Psycho · « **Reply #6 on:** September 12, 2007 - 11:56:57 AM »

no just makes a bettter spark as long as the coil is a high output

Katfish · « **Reply #7 on:** September 12, 2007 - 06:18:25 PM »

Thx, now I have a mini-project for the weekend

GoodysGotaCuda · « **Reply #8 on:** September 12, 2007 - 06:28:14 PM »

no just makes a bettter spark as long as the coil is a high output

More resistance in the circuit to ground from the coil = more spark. Does make the coil work harder however. I'm around .040 as well, MSD coil/6a