Re: Hardened valve seats or lead additive...

Posted by D-train On 2012/11/28 0:41:23

To be clear... The block that cracked is the one that I used the additive in. (however, I am not attributing the crack to that). That block had previous water jacket corrosion that caused the re-crack. I mentioned that block but didn't finish my thought... When I pulled the head, there was alot of oily buildup in the cylinders. I'm wondering if it was the lead additive. I don't really feel that it was oil, but I could be wrong.

The block that I am rebuilding is in good condition and is at the machine shop. The machinist and I were discussing the installation of hardened seat inserts. ...not actually flame hardening. He doesn't have the equipment to do it.

The previous poster brings up a good point about sustained highway speeds. I will probably do some highway driving, so I may use the additive then.

Sorry for the confusion!

Mark

BTW... I had bought the replacement engine from Mike Dulinski. The engine turned out to be in great rebuildable shape. Thanks again Mike!