So the latest-
I've tried 3 different versions of a grinding set up to grind my own camshafts and the results I've not been happy with so next
Tried talking to several camshaft shops all over the US and Canada. Megacycle could do it and also Colt Cams in BC Canada also have master profiles to do it. Both want around $500 to grind a set of cams. and let's not forget this was to overcome deep valve seats that a machine shop cut for me too deep. And then there was the camshaft grinder in Toronto Ontario who ground a set of camshafts so bad that the base circle of the cam was cut below the cast material of the camshaft and the only follower that could ride on that base circle surface would be a roller lifter. IDIOTS !! Anyway, any work to be done on the cams was going to cost $500.
If I have to spend $500 to "fix the problem" I might as well get new seats put in the head and have the seats cut so that I can use 2.90 - 3.00 shims and have a virtually new head.
I talked to Competition Engines in Markham Ontario and they could do the seats for $500. They have a Kwik-Way valve guide and seat machine and the expertise to do it so I kept that in mind. I went back to Peterborough Automotive who are the people that did the original valve seat refacing but too deep and discussed the problem with them. They can also replace the seats and they have a far superior guide seat machine Sunnen PGM1500 and also the expertise to do it right. What happened when they refaced the old seats was the seats were too far gone with pitting and the shims were down to 2.20mm before they even started. I should have caught this before I sent them the head. Bottom line- the original seat refacing was $200. Replacing the seats this time, $30 per hole labor and $11 per seat. $491 total.
In a previous life I did valve seat replacement using a tig torch to lay a bead on the inside of the seat which sucks the diameter inwards and the seat will drop out. So for shits and giggles I got the tig torch out and had a go at one of the seats. First time around a little scary. Popping and sputtering, porosity, just ugly. After a second pass things settled down and the seat material formed a bead so I guess the seat was contaminated with oil and carbon which must have burned off.
Here's a couple of pics of what a seat looks like after laying a bead and popping it out of the recess in the head. And for the record, the recess is as clean as a fresh cut recess.i could just warm up the head and drop in a new seat.