[DeTomaso] Lead Substitute

[Sean Korb]

I would lose sleep over it but only if you are ... exuberant.  I put a
motor together and the valves looked fine (CJ heads so 4V valves
without the quench area) and I heard that the redline was 6000 and I
put rollers in my rockers (Crane had a kit) and I bumped the camshaft
up to a Crane with .554 lift so for sure I was going to go faster!

Well, I did go faster and my engine ventilated itself when the valve
sank after the top of the stem popped off.  I was miserable.

There is no reason to shift above 4800 on a stock motor ever really,
so if you have a little fun and take it easy you'll be fine.  Don't
get all indy 500 on it or you will be sad.

Now I have 1 piece valves with a stock cam and I live in abundance and joy.

I took a bunch of pictures of the water pouring out of the crankcase
in 1996 with a fancy electronic camera but in another fit of "what
does this button do" they were all magically erased.  Ah well.

sean

On 6/5/19, Mike Drew via DeTomaso <detomaso at server.detomasolist.com> wrote:
> Wayne,
>
> Ford engines reportedly had high nickel content in their cast iron and lead
> additives aren’t generally considered necessary, especially considering the
> low mileages our cars typically see. That is what I have been told by people
> who purport to know such things—I claim no particular expertise here.
>
> More concerning is the propensity for stock valves to break in two which can
> wreak havoc on the engine block and pistons. I wouldn’t lose too much sleep
> over it, but if at some point you decide a valve job is necessary,
> definitely do NOT reuse the stock valves and instead insist on Manley or
> other one-piece stainless valves.
>
> Mike
>
> Sent from my iPad
>
>> On Jun 4, 2019, at 08:58, Wayne Boian <wayneboian at windstream.net> wrote:
>>
>>   I saw a bottle of Motor Medic a Lead Substitute by the makers of GUNK
>>   and was wondering if I should be using this or something like it for a
>>   73 Cleveland motor. The motor in #5683 is stock except for the intake
>>   and Holly carb. I am not sure if the valve seats were set up to run
>>   no-lead gas in 1973 or not. So what do you guy (and gals) do for or
>>   mildly modified motors?
>>
>>   Thanks
>>   Wayne
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65 Suprang,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso