318 head porting for the average joe

need your help wild and crazy guy ! duplicating this question from my restoration thread

Working a freshening up my 318 646 heads, motor has 14 thousand KM's on it.. built by an engine shop 10 years ago.

Motor is apart and I pulled the valves from 1 cylinder to look them and the ports over.


On The exhaust valve, the seal had ridden up inside the valve spring.. not on tight on the base as the intake size was.. Is that wrong?

2nd question I had to use a center punch to push the exhaust valve out of the head, really had to use a lot of force to remove it. small bits of brass left in the valve lock grooves when it came out.

Is that normal ?.. Intake valve popped out no problem.??




3rd and final for today What do you think caused the build up on this intake valve.. This motor has 14 thousand KM's on it. I know it was running rich for many of those miles prior to dialing it in with wideband air/fuel setp.

Thanks ! Ken
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That is burnt oil and fuel deposits on the back Side of the valve, umbrella seals??...see positive seals press onto the guide boss and control the oil better...but I'd say that the guides and or valve stems r probably shot cause the int is sucking oil.
FWIW Umbrella seals ride on the valve and let oil get sucked into the guide easier.
Next time u remove valves....1st run a file around the lock groove cause u just carved out the bronze sleave.