SBC 350, BR6FS plugs compared to RV15YC4's

[Sand Dawg]

What is the difference in these spark plugs? Thanks.

[Moneypitt]

All plug manuf. have heat range charts. The one # looks like a champion, and I think the other is NGK,( a guess). You need to ask your local dist. for this heat range info, its in the book, and they may have a chart to give you. ....... Someone here may know it off the top of their head, not me.........

[Sand Dawg]

One is a Champion and the other is a NGK. The NGK is what is in the motor now but looking back at a responce that Dennis Moore said a while back , he told someone on here to run the Champion's. My motor is the same as the other guy's SBC 350. Just trying to get the most out of a stocker...Thanks

[celeb1]

I think the champion you mentioned has a pertruding tip to position it deeper in the cumbustion chamber for a more efficient burn. I have heard that there is a possibility of the piston smacking the extended plug on certain septups but probably not on a stock motor.