Date:         Tue, 25 Jun 2002 16:39:43 -0500
Reply-To:     "joe@cedar.net" <joe@CEDAR.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         "joe@cedar.net" <joe@CEDAR.NET>
Subject:      Re: Commentary on Air Cooled Cylinder Heads
In-Reply-To:  <016201c21c64$104415c0$f4800fce@vern>
Content-Type: TEXT/PLAIN; charset=US-ASCII

Silly question: AMC--who is this or what is it an acronym of?

Joe

On Tue, 25 Jun 2002, Robert Donalds wrote:

> I currently use new AMC heads on my rebuilds for the following reasons
> the type 4-2 heads take a beating and see hotter temps than most other air cooled heads with the exception of the zambonis ice resurfacers that use a type 1 single port fueled with propane. I have stopped tiring to rebuild OEM heads due to the fact that most cores are just plain old used up. The AMC heads have gotten a bad name because they have in the past dropped seats like the OEM heads did. The current version of the air-cooled AMC are staked in place and I have not seen any of these newer staked heads loose seats or have any issues with seats that have gone soft (pounded out).  The AMC heads are made of a different alloy that is much less likely to crack but the new alloy also tends hold the heat a little more so they do run hotter.
> Aircooled type 2-4 engines need all the help they can get to keep the heads and pistons as cool as possible. In my rebuilds I currently use a cam with higher valve lift but not more duration so as not to affect the injection system. I hone the cylinders for more piston to skirt clearance as well as notch the con rods to spray oil at the pistons.
> the only other options I offer is a 2mm larger valves 42 intake and 36 ex with the extra hard seats and a high flow valve job nices upgrade
>
> Bob Donalds
> Boston Engine
> http://www.bostonengine.com
>