Reading spark plugs

Photos is #1 plug, 2-8 look very similar. This is a mix of 93 octane pump and 110 Rengade fuel.

How much leaner do you think I can go?

545 w/ TFS heads 12.25:1 CR 30* timing locked out. Thanks for any input!

is that one pass ? did you idle it around the pits ? or is this a street car with multiple miles ?

Street driving, 22 miles most of it highway @ 2600 rpm... two runs up to 6,500 rpm.

It looks good for street driving. I wouldnt go leaner

Thanks for the replies guys. This is the stongest engine I've had in the car so far and want to get as much out of it as I can without hurting it.

Please show a pic. of the ground wire from the side.

Thanks, I'll do that and try to post it this evening if I can.

color looks good for street driving, hard to get a good read on the timing mark.

I agree with Lem, need a better view from the side. From this angle the ground strap looks to be a little on the warm side.

Get a AF meter, the pump gas is almost impossible to read. The driving and Idlin around make it hard too. Make a full pass and shut it off and check them.

Thanks for the advice, I'll leave it as is, A/F monitoring guages seem to be getting more and more popular but I think a TFS Mafia intake is next on the shopping list...

i would guess you are pretty conservative at 30degrees, i would think 34 is more favorable