Re: Hardened valve seats or lead additive...

Posted by PackardV8 On 2012/11/27 22:57:45

I'll agree with the advice of Ross 100%. However u mentioned a cracked block that had been repaired but did not indicate WHERE the crack repairs is. Assuming the crack repair is not in a valve seat then no seat inserts should be necessary. IF seat is cracked then a seat insert mite very well be a good idea.

Another potential problem with seat inserts is that they can come loose. UNless a seat is cracked i would avoid inserts Regardless of the type of valves used.

I mite add that u refered to "... have the seats hardened". I'm not real sure what u mean by that. I assume that means hardened seat INSERTS that require a machining process to install them. IF u were told by someone that the EXISTING cast integral iron seats as they came from factory could be hardened as opposed to a maching process to replace the seats then i would sure like to know what that hardening process is. I've never heard of simply hardenenig an existing valve seat.