Re: 258 pistons, deck height

["Jim Blair" <carnuck@xxxxxxxxxxx>]

A: Part way into the year the head was redesigned to a more open chamber 
(part of AMC's lightening of the motor campaign) and the pistons were 
redesigned to make up for it. I have an '80 258 which has the lightened 
crank (12 throws vs 8 vs 6 in later motors with '79/80 in the middle) The 
bottom end is scrap (vented the side of the block with at least one rod) but 
the head with the last of the tin covers is available in my forsale stuff.


From: "Jim Mantle" <jmantle@xxxxxxxxxx>
To: <mail@xxxxxxxxxxxx>
Subject: 258 pistons, deck height
Date: Wed, 27 Oct 2004 19:00:21 -0700
Message-ID: <000001c4bc91$e52036f0$0100a8c0@BASE>

Something for you 6 cylinder guys, in 1979 there are 2 different pistons
listed for the 258, both with substantially different pin heights. The
single barrel carb engines show a different number than the 2 barrel but
the block and rods are the same. Does anybody know what was happening?
Did they just leave the piston further down in the block with the single
barrel engines?

Jim Mantle