30-03-2018, 08:06 AM
(29-03-2018, 06:28 PM)Colin Wilks Wrote: I am sorting some sticky valves and apart from some strange grooves in the valve's sealing faces, which I'm putting down to somebody lapping them in by rotating them in one direction with a sucker on an electric drill, a couple of the exhaust valves (4&5) are sitting slightly below the level of the face of the block. I do not want to get the block refaced at this stage and intend starting afresh with some new valves, but how far into the block do people feel is "too far" for exhaust valves to recede before there is a serious impact on exhaust gas extraction?
Colin, I reckon most people nowadays try to build their engines as good as they can be, in the hope that they won't have to touch them again for a long while. If you're in this camp you'll know what to do.
On the other hand, if you only take the car out on summer Sundays and peak performance doesn't bother you it'll probably keep on running for years. The day will come though when you have to strip it all down again.