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Topic: Stainless Steel Valve question (Read 229 times)
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PA Dart Guy
Jr. Member
 Offline
Posts: 32
68 Valiant getting a 440 Heart Transplant
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I was told by a machine shop that if I used a stainless exhaust valve that I did not need to have hardened seats installed for unleaded gas. He told me that the hardened seats only needed to be installed if I was running a stock steel valve. Is this correct? It kinda makes sense to me.
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Womanator
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I wpuld run a hardened seat on a steet car.
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bOb shingler
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no he's not correct. heads need to have both, with a harden seat the valve face is eroded, with a ss valve the seat is eroded away.
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"bOb Built" (no matter how many times it takes)  |
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PA Dart Guy
Jr. Member
Offline
Posts: 32
68 Valiant getting a 440 Heart Transplant
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Yeah, I guess that makes even more sense...
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68_Val_Sedan
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non daily driver ? If so just get put the SS valves in,do a valve job and drive it ... it would take 30,00 miles of driving to have any issues with the non hardened seats ....
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67 dart 270 resto mod in progress ...
68 chrysler 300 wish it was my daily driver ...
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PA Dart Guy
Jr. Member
Offline
Posts: 32
68 Valiant getting a 440 Heart Transplant
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Gonna be a weekend warrior... Yeah, some really cool  member just gave me a set of 915 heads  ....Gonna use them until I can afford some aluminum ones... |
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Thin White Duke
Full Member
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Posts: 423
BigBlockDart.Com
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You need hardened seats as there is no lead in the gas anymore to help protect and lubricate them.
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68_Val_Sedan
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You need hardened seats as there is no lead in the gas anymore to help protect and lubricate them.
so as soon as they quit making leaded fuel all the cars on the road had the valves pound the seats out in 1000 miles ? Please .... |
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67 dart 270 resto mod in progress ...
68 chrysler 300 wish it was my daily driver ...
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Thin White Duke
Full Member
Offline
Posts: 423
BigBlockDart.Com
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No, but you will lose your valve seal quicker and will lose horsepower.
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NYrr496
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Is it possible to have heads induction hardened like factory heads? They just heat the seats with a torch or a friggin' laser or something... They don't add hardened seats.
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It takes a Mopar to catch a Mopar.
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pwmax
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If its a weekend warrior car, that your not going to tow a trailer with, or drive cross country, then, you can get by without them, if you use an upper cylinder additive, like Marvel mystery oil, or Lucas. It helps. Unless you have a real plugged up exhast, and work it hard, like in a tow truck, trailer towing, or motorhome application, with the plugged up ex, where the exhaust temps are elavated for a long time, then its mandatory. But for something your going to put 500 miles a summer on, I would use the additive, and not worry about it if they are done. But, the stainless valve, is actualy harder than a stock valve, and will hammer it worse.
Frank
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375InStroke
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I have cars that have been driving on unleaded for over 30 years without hardened seats and no problems.
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fourspeed
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My 340 had 360 heads on it and had too much compression for pump gas. The exhaust seats were ALL recessed. Ran like crap. If you're having heads done anyway, getting hardened seats (exhaust only) is not that much more...
OTOH, if you're not going to run those heads for very long, screw it.
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