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I have in my shop seen almost all thats available and they all have good stuff and some have not so good stuff but over the past year or so all the heads we get we have had to check and some re do the valve job as it is all over the place we start buy lapping the valves with fine compound and check that all the seat margins are in the same place and as far as PC seals go their the best BUT if you dont use ( HYLOMAR - its a blue colored sealent originaly invented by Rolls Royce in the 70s ) it stays put when applyed use rubber gloves and the seal wont ride up and down with the top retainer if you use a small amount around the top of the valve guide it will keep motor from using oil and you wont see it smoke but it will use oil if you know what i mean ( at slow enging speeds the seal will sort of work but 70 mph with stock gears it will eat a quart in no time ) just my experence on doing this all the time -- most auto stores carry it again use gloves you will not believe how much you will end up on you if you dont jz
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