Posted by Kaegi [108.162.245.235] on Tuesday, April 11, 2017 at 12:11:09 :
In Reply to: Re: 251 Timing and Freeing Stuck Valves posted by John S [172.68.65.195] on Tuesday, April 11, 2017 at 11:39:15 :
the super HD version are stellite. some of the HD engines had sodium filled valves as well.