DeTomaso Mailing List: May 98, Message #42

>I am not sure about Dave's valve, but if any of you newbies don't know
about
>one of Fords better ideas, you need to.  Ford, with the 351 and other
>engines, went to a "multi-groove" keeper on their valves.  These have
>rounded grooves, and were actually designed to kind-of float and allow the
>valves to rotate, thereby extending valve and seat wear.  The problem is
>that the "floating" keepers float right off the valve stems at higher RPM,
>allowing the valve to drop into the cylinder with drastic results.  When
>rebuilding your heads, ALWAYS insist on single groove valves and keepers.
>
>Ted (Vader) Mitchell
>http://home1.gte.net/tmitch/pe.htm
>http://home1.gte.net/tmitch/chpie.htm
>http://home1.gte.net/tmitch/index.htm
>
>-----Original Message-----
>From: Charlie McCall <Charlie.Mccall@HaworthInc.com>
>To: Multiple recipients of list <detomaso@realbig.com>
>Date: Friday, May 01, 1998 7:33 AM
>Subject: While I'm at it...
>
>
>>While I'm thinking about it, could someone educate me a little bit - what
>causes a valve to drop in the first place? Dave D did it because he used a
>cheaper part that wasn't up to the task, if I remember correctly. My motor
>is a relatively stock one with 37 or 38K miles on it, so it hasn't been
>driven a zillion miles and is just worn out. Got to wondering, because even
>if I didn't do this I'd wonder about doing it in the future, since others
>have done so  in the past...
>>
>>Thanks
>>
>>Charlie McCall
>>1972 Pre-l
>>#3847
>>
>