what spark plugs for a mild built 340

1970Duster said
I use Bosch plat 4 no problems ever

Except the electrode goes away real fast in a heavy service motor....

The higher compression 340's ran the colder plug.... :thumblef:

if you are running the correct heat range...the brand of spark plug is not going to matter..

:thumblef:

Autolites were the worst....I run a 750 DP high 11 second car. MSD loves NGK and its not even dyno tuned yet.

Run great in a blown alchy 6 sec olds based car.......