Moonder

I was thinking the same

PEETYZ

Cylinder 7 is almost always leaner. Step colder plug is a bit safer there.

Milan any experience with different gaps?

romandian

is that right? why 7?

Lloyd Christmas

Something about the manifold design. Somehow 7 ends up with more air than all the others.

Milan

Cylinder #7 is the last to get fuel, or so that's the theory. I think that may be only an issue with stock rails but I will let someone else who knows for sure chime in.

Not that I have any dyno proof of. I run the D585 (truck coils) with the dwell cranked up so I can get away with a little more gap. E85 likes spark a lot.

SilverZ06NC

I went from the tr6 gapped at .35 to the br7 and gapped to .22. It works for my setup, but it is different for every setup. I just wanted to get away from the protruding tip, and it liked it. I think ohming out your plug wires a couple times a year is good practice also. I had a plug wire that ohmed high and changed it out, gained 17 RWHP. Nothing changed but wire, then they continued to adjust it from there. Just a little FYI.

MVP'S ZO6

I ohm my plug wires often too. I've caught bad ones.

jbsblownc5

BR7s here, around 32...

Guess I'll try dropping down a bit on the gap, and need some fresh wires, what do you guys like BEST???

Moonder

Some please say the cause of failer to piston # 7 when there is no steam line run from the rear of the cylinder heads to the radiator witch cause more heat

a/c man

I think the way the intake is it gets more air. May be wrong?

romandian

well, if intake is not perfect, i can see the front cyliders gettig more air or the rear ones. but just one?