#6 Intake Valve sparkling clean compared to rest??

[Justa6MB]

The engine is out of my car and the heads are off. Last night a friend and I pulled all of the valve springs and checked the spring pressures. We pulled the valves out as we went to check the seats and valves. We did the drivers side 1-3-5 and then psgr 2-4-6. All of the valves were pretty sootey and black - I was running leaded race fuel last fall so maybe that had something to do with it also. Anyway we got to the last cylinder - #6 and the intake valve looked like it just came out of the dishwasher! It was absolutely spotless and sparkling clean. That made me nervous... I've got a Razors single nozzle alky system, and I'm not running a powerplate. I have one but have read mixed reviews on them and also since it goes against my logic it's not on there. But when I saw that valve it made me wonder??? Could too much alcohol be flowing to that cylinder and causing that valve to be that clean? And if that's the case I can't imagine that's a good thing? The nozzle is in the up-pipe I'd guess about 10" ahead of the throttle body spraying toward the back of the engine. Thoughts?
Thanks
D

 

[earlbrown]

Is the combustion chamber and intake port noticeably cleaner than the others too?

 

[SCOOBY DOO]

What's the plugs look like?

 

[Steve V]

Nozzle needs to spray towards front of the car to mix the alky into the airflow.

 

[Justa6MB]

I had another look at the plugs and they all looked similar. And the combustion chambers also all looked similar. I will double check the nozzle - I know the elbow faces toward the radiator but I thought the nozzle faced the rear of the car.