RE: IML: Unleaded or Leaded gas

["Rob McCall" <Rob_Mopar@xxxxxxxxxxx>]

>From what I've read, the unleaded heads were being phased in for the '72
model year, along with the lower compression ratios.  By '73 everything
should have been unleaded.  I believe cat converters were phased in during
'74, and unleaded was mandatory for the cats to live.

Rob McCall
'67 LeBaron, lead-head (but I do have a pair of '452 casting heads on the
shelf if necessary at a future date).

----- Original Message -----
From: clgilleland@xxxxxxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: IML: Unleaded or Leaded gas
Date: Wed, 8 Mar 2006 00:36:57 -0600
Hi, I was wondering When did Chrysler start putting hardened valves in
engines so they could br ran on unleaded? I have a 74 Imperial with a build
date December of 1973. 

Fred Joslin





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