2006EvoIXer

iTrader: (1)

This is what I found before I dropped it off. I shined LED flashlight on combustion chamber and took this picture through valve port on intake manifold side (60% leak from leak down test).

RazorLab

iTrader: (8)

Right, I saw that before, but the head overall looks normal to me. Valve seat wear seems about normal for a hard driven 4G63, been there done that.

2006EvoIXer

iTrader: (1)

Check out the buildup. Is there a way to keep this clean?

2006EvoIXer

iTrader: (1)

do i need to plan on pulling head every so often?

2006EvoIXer

iTrader: (1)

How are there stains on my exhaust valves on the part that is inside the bowl right above the seat?

MinusPrevious

iTrader: (3)

Not aware of the background on your EvO. Youve owned it for 6 years? and have been running E85 for less than a year.
This build up is obviously all 91 build up coupled w/leaky valve seals. Maybe the previous owner ran 87 through it?

Ive been on E85 for 10 years & was never out of service & always in a good state of tune. Now my spark plug issue may have been E85 related, but will always use anti-seize going fwd

Dont think youre going to see this level of deposits running mostly E85 w/your 91 cycles, as required

2006EvoIXer

iTrader: (1)

I got it brand new in 2006. I actually bought it 3 weeks before it was offloaded from port. It was stock for 2000 miles and then I got Vishnu V400. It stayed that way until last year where I started building it before 1st timing belt work at 56k miles. I'm at about 61k miles now. I guess 91 could have done all this over the years.

2006EvoIXer

iTrader: (1)

Forgot about this thread. Here's my head now.

2006EvoIXer

iTrader: (1)

2006EvoIXer

iTrader: (1)

Ayoustin

iTrader: (2)

Late to the party on this one but next time you've got a bunch of gunk on valves the quickest and easiest way to clean them is with a brass wire wheel on a pedestal grinder.