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AMC 390 rebuild...what Valves? |
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1968Javelin343 
AMC Apprentice 
Joined: Jan/21/2008 Location: New Jersey Status: Offline Points: 158 |
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 Posted: Dec/04/2018 at 11:08am |
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Bryan
1968 Javelin 343 |
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Trader
AMC Addicted 
Joined: May/15/2018 Location: Ontario Status: Offline Points: 6881 |
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Posted: Dec/04/2018 at 12:22pm |
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To answer the valve stem question, I have never used valves unless 0.030" above the spring retainer, regardless of rocker type.
And yes, I have ordered AMC valves (and returned them) and seen valve stems below the spring retainer. Comp has disappointed me a couple of times on new, but they exchange and I get +0.050" on the same part number. I believe it must be a supplier issue. I have a couple of stock 360 and 401 pistons with some dents in the tops. It's usually the 502 heads with the exhaust valve rotator, but I cannot definitively state the valve stem extension or rotator was or was not the problem. Just took apart some 291C heads and someone did a fancy valve job with only 1/16" (or less) exhaust valve contact area. That contact area is for cooling the valve and should be 3/32". There is were I see valves failing more often.
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super-bee_ski
AMC Nut
Joined: Nov/13/2012 Location: Edwards AFB Status: Offline Points: 489 |
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Posted: Dec/11/2018 at 2:09pm |
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Thanks for the input on purchasing "over the Counter Valves"
Yes, as many on the forum agree, CHOICE is limited... Going the LS route seems to be my option...
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-1977 Gremlin X 4-speed AC LEVI with 500,000+ miles on her!
-1969 SC/Rambler "A-paint scheme" -Her name is "Abby" |
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