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Old 05-03-2004, 09:26 AM
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leak on my heads

i did a port and polish job on my 455 head and i kinda messed up when i did the chamber part because i went over the valve seats and now they leak. i found out because i read in this engine rebuild book that to check if its leaking, put the heads together, spark plugs and all, and fill the chamber with kerocene. if it leaks then you need new seats. well my heads leaked so i was going to take them in to get the seats redone but before i went i tried the same test on my other head (witch i hadent ported yet) and the also leaked.

My questions is: is the test any good or are both my heads bad???

i did a search but found nothing that would help.

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Old 05-03-2004, 10:59 AM
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If you in any way marked or touched the seats with whatever tools you used in porting, etc., you will want to have the valves reground. At this point, even if the seats were okay, you should think about a having a good valve job done anyway. It would be the basis of a good, solid build-up.
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Old 05-03-2004, 12:41 PM
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thanx, next thing would be if a 3-angle valve job would be necessary for a mild street engine (375 hp)
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Old 05-03-2004, 03:24 PM
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A three-angle valve job is nothing more than a seat angle and two correction angles. The correction angles are use to control the width and placement of the valve seat on the valve face. A three-angle valve job is what every valve job should be. If someone tells you that a 3A valve job is only for "high performance", they don't know what they are talking about. If someone charges more for a 3A valve job, go find real machinist. More angles are used to help the valve flow, but they aren't necessary for your application.

tom
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Old 05-03-2004, 06:20 PM
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thanx, you guys are too good
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Old 05-03-2004, 06:35 PM
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Make sure they check the clearances on the valve stem too! I've had "vlv. jobs" done then after installing the head have the engine "drink" oil. The vlv. stem clearances were the problem! AND DON'T let anybody talk you into "knurling" the guide either, a totally waste of money. Good Luck! ...Mark
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