360 - Lean/Burnt valves

[GoodysGotaCuda]

I've had my Warlock for two years and have only put about 3,000 miles on it. The engine is stock with a retrofitted factory 4bbl intake and thunder avs carb. Just putted around, no towing or hauling worth mentioning.

I pulled the heads to swap them with some 2.02 jheads that I have and can't help but wonder why the original heads are like they are.

My lc2 wideband would show it running lean in the top end, about 15:1 but I rarely ran it up there because it was such a dog anyway. Cruising was a healthy 14-14.8 AFR. Idle and lower rpm acceleration was in the 12-13 AFR range and it gradually ran leaner.

It had no signs of vacuum leaks, stock full exhaust [manifolds] but it looks like the fuel distribution must have been off somewhere.

Thoughts?






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[Cudakiller70]

  Those look like mine did, all exhaust where gone. I'm back together and AFR readings are same as yours. 

[Chryco Psycho]

Cruising at 14 range to me is a bit lean , what you have to remember is the exhaust valve takes all the heat hanging wide open in the middle of 2000* exhaust heat with no cooling until it closes .
IMO those look relatively normal to me , often the exhaust is a bit more brown like the middle valve

[YellowThumper]

Agreed with above post. Mine also have looked like that. Would suspect fuel blends contribute as well.