DrX

iTrader: (7)

Crower shaft mount rollers, LS7 style, 1.8 ratio.

DrX

iTrader: (7)

Few more pics:







This piston is different. Lighter/more reflective deposits. Melted?


After some scratching, I think it is just crud on the piston.





Looking through an injector boss into an intake port:


Cut plugs:

GMCtrk

iTrader: (27)

Looks bad. Mph was down, motor likely hurt.

DrX

iTrader: (7)

Just need to find the why(s). Think it should have done better than 124 MPH last year as well.

Gadgetized

iTrader: (9)

I wonder if your rings were butting. Do you know what your intake temps were at the end of a run? I am running more gap on E85 and an external intercooler/turbo combo that should work better to cool the air charge.

DrX

iTrader: (7)

Last log started the pass at a heat soaked 136* and ended at 180*

Gadgetized

iTrader: (9)

What im wondering is if the rings butted and hurt the cylinder walls. The hurt walls caused excessive blowby, and contributed to pushing oil down the guides. That could have been why you were getting the rear of the valve cover gaskets leaking and the dipstick pushing out. I'm not certain about this, but it is what I was thinking.

03sierraslt

iTrader: (22)

How much boost?

DrX

iTrader: (7)

19 psi

George C....

time to tear motor down and check for pistons that have busted lands