On Mar 4, 9:08am, U. Goettsch wrote:
> Subject: dreaded leaded / unleaded
> This is straight from the Italian Cars list.
> Thought it was interesting.
> Ulix
>
> __/__,__ ________/____,,_______
> ................... (_o____o_) ..... (___ O _________ O ___/ ..............
> '67 Sprite '66 Caddy
>
>
> From: David John Williams <babyhuey@csd.uwm.edu>
> Date: Fri, 1 Mar 1996 07:49:55 -0600 (CST)
> Subject: Unleaded fuel
>
> In the US, by law every car solf here for model year 1971 and later was
> required to have hardened valve seats capable of running on unleaded
> gasoline. Apparently, not all manufactures followed this rule, or had to
> learn how to make hardened valve seats correctly.
>-- End of excerpt from U. Goettsch
Just in the interest of keeping the facts straight, there was no
requirement to use hardened valve seats in 1971. GM didn't start
using them across the board until 1973. I believe that Ford started
at the same time. I don't know where Mr. Williams got his info, but
it is not true.
I just verified the GM info with a former (retired) GM engine engineer.
I fact, the sequence was hardened valve seats - 1973, electronic
ignition (simple no breaker points) - 1975, catalytic converter - 1975.
Doug Mitchell
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