Re: [Amc-list] 4.0 #7120 Head to 258 Swap

[Frank Swygert <farna@xxxxxxx>]

There are plenty successful 4.0L head/258 block adaptations though. But maybe saying it's "a crock" is a little strong -- it's all theory and no proof though (as you said). Not only that, but for good reasons which I laid out I can't see how it could possibly help. Like the quench theory that's about all it is. Lots of strokers have been built (like mine, and I think yours?) without worrying about "proper quench" and they put out very good power. Lots more time and money for very little gain. Even the long rod theory does the same -- more expensive custom pistons for very little gain. The most gain that I can see is a slight reduction in wear by using the slightly longer 4.0L rod, the acceleration gain is in the 0.0x second range... got to be pretty tight competition for that to make a difference, at a relatively high cost. Of course if you're going custom forged pistons for other reasons anyway you may as well use the longer rod since it won't cost any more to have the pin h
 eight moved up slightly.

I didn't think about a die grinder at the time, the router was my first thought! Note that I did mention making a template too though. I wouldn't try hand guiding it on something hard, or taking off very much. I've used one on cast iron before, but just rounding off an edge about 1/16" with no problem at all (it wasn't an engine block, may have been softer iron). Of course a heavy long sleeve shirt or jacket (like a "blue jean" jacket), a face shield (not just safety glasses!), and gloves are a must! flying hard metal chips don't feel good...

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Date: Tue, 08 Jul 2008 01:48:51 +0000
From: Wrambler242@xxxxxxxxxxx
	
Uh, I for one don't agree that any of this is a "crock"...
Just not been proven or dissproven. 


I'd also hesitate to attempt to "mill" the block with a router.
Pistons and or aluminum would be fine. I'd still not do it.
Trying to do a clean cut on a cylinder bore with a hand held router and a carbide bit?
You can do it as quickly with a diegrinder and have better control.

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


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