Re: [Amc-list] What I-6 Did I buy?

[Frank Swygert <farna@xxxxxxx>]

I believe some of the later model 258s had a 4.0 like valve cover -- the 87-89 models, maybe. 

But it could be either of the ways you are guessing -- 258 or 4.0L with mixed parts. The easy way to check is to look at the engine number near the distributor.  The third character is a letter and will be M or MX for a 4.0L, I think C for a 258. 

The tone ring flywheel is definitely 4.0L, but it will fit on a 258. The 4.0L flywheel is needed to run the 4.0L mini starter. Could be a 258 with the mini starter on it. The offset of the teeth on the flywheel is different for the mini starter vs. the old style 258 starter. 

There are no worries about the clutch -- they will swap between the 4.0L and 258. There really aren't as many differences between a 258 and 4.0L as you'd think, other than the fuel system. Most parts interchange, but there are some caveats like thi mini starter requiring the 4.0L flywheel. 


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Date: Fri, 13 Mar 2009 21:17:38 -0700 (PDT)
From: Jesse <j2sax@xxxxxxxxx>

Today I picked up a "258" while on my trip in Wichita.? The guy has a 5 spd, 89 Wrangler YJ and he is putting in a Chv 350.? 
?
I met up with him and took delivery of the engine and a 231 Transfer case, but something is weird with this engine.? 
?
It has a valve cover like a 4.0.
?
It has a flywheel with tone ring
?
It is carburated, with an "Electronic Carter".
?
It has V belts on the front accessories.? 
?
So, my first thought is, a 258 with 4.0 head, covnverted to carb... but why the flywheel with tone ring?? 
?
Next thought is 4.0 converted to carb... but why the v belt pulleys... didn't look like anyone ever changed the Wtr Pump.? 
?
Tomorrow I am taking to a pressure washer to clean.? My only real concern, will the clutch set that I have for the 258 in my J10 T5 work with this tone ringed flywheel?? The guy says the clutch set on there is pretty good, however, I don't want to put this back together with a used clutch.? 

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
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