Hardened Valve Seats or Not??

[55 Fargo]

Hey all, whats the fact on Mopar L Head 6 engines, were they built in the factory with hardened valve seats, or not?

If so, were all Mopar flat head 6s equipped with hardened valve seats?

If so, why, were not most of the others valve seats, just ground into the cast iron?

Why would the Chrysler corp be different, was there a reason to have hardened valve seats way back when.........Fred

[greg g]

Conventional wisdom is that the exhaust valves are at least hardened in all 6 cylinder L heads, HD trucks got other goodies also.

[Guest P15-D24]

Hey all, whats the fact on Mopar L Head 6 engines, were they built in the factory with hardened valve seats, or not?

If so, were all Mopar flat head 6s equipped with hardened valve seats?

Answer is Yes and Yes

[Dodgeb4ya]

In the standard MoPar passenger cars and light trucks the block has hardened exhaust seats installed and the intake seats are just machined into the block. In the heavier truck and industrial applications the hardened exhaust seats are "Thompson Stellite" faced as were the valve faces of the intakes. Silchrome valves apply in a lot of engines too. Bronze valve guides were factory installed in the sodium valve engines.

Bob