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) and cheapest, and fool proof ways to hold the valves in place is a few feet of plain 'ol cotton clothes line rope. pull all the plugs, use a straw or metal rod to determine how far down the piston is. you want it kinda low. push a few feet of rope down the hole then turn the crank until the piston mushes the rope. no hard stop, nothing breaks, nice soft landing etc. do your trick with the seals, OIL THEM!!, lower the piston and pull the rope out. guys have been doing it that way for over 100 years. just don't put the greasy rope back on the clothes line.Whenever I've done cam swaps with valve springs in OHC cars I just use a line from a compression tester kit with a regulator on it.....never heard of the cotton line trick....sounds kinda scary to me haha

Well guy told me $250 and thats the same guy who changed my bearings for $50. I just think he undercharges bigtime.
When I had a set of heads done, it cost me at the machine shop around $220 to get the valve stem seals replaced. These heads were the ones I did a head swap in the red MTX in my sig. It was probably a good $6-700 doing the entire swap with purchasing all the gaskets, and fluids.
Well guy told me $250 and thats the same guy who changed my bearings for $50. I just think he undercharges bigtime.