ronald bruce taylor,jr wrote:
> The block has been checked for cracks, I asked what it needed done to make
> it useable and all it basically needed was the mains align bore honed,
> punched .020-.030, and decked .010 to square it up.
>
> It has the mounting bosses cast in it that are similar to the ones on my
> 3.9, I'm just curious as to what makes the difference between the Pre-Magnum
> and Magnum cylinder casing castings?
>
> I'm going back later this week to check it further and see if I can find the
> casting Date on it..........
>
> Ron-
> 01'Dakota Sport 3.9 4WD
> www.scsilverdak.1colony.com
>
>
>
> ----- Original Message -----
> From: "greg conner" <dodgeboy93@hotmail.com>
> To: <dakota-truck@dakota-truck.net>
> Sent: Monday, March 29, 2004 8:03 PM
> Subject: RE: DML: 3.9 Engine blocks ?
>
>
>
>>Well all the 3.9's used a roller cam. Look on the side at the casting
>>date.
>> Your gonna want a mag block (92 and up) I dont beleive the older blocks
>>have the bosses on them to use the motor mounts in your block.
>>
>>I'd check it over (maganflux) for cracks and such. Also check in and
>>around
>>the headbolt holes closely for cracks, thats a common spot on a high
>>millage
>>engine.
>>
>>
>>
>>Greg Conner
>>1996 RC
>>3.9 hybrid
>>
>>
>>
>>
>>
>>
>>>From: "ronald bruce taylor,jr" <taylor9565@msn.com>
>>>Reply-To: dakota-truck@dakota-truck.net
>>>To: "Dakota Mailing List" <dakota-truck@dakota-truck.net>
>>>Subject: DML: 3.9 Engine blocks ?
>>>Date: Mon, 29 Mar 2004 19:13:50 -0500
>>>
>>>
>>>I've run a across a Bare 3.9 engine block at a Pretty good price of
>>>$40.00,
>>>it needs to be fully machined and prepped for use.
>>>
>>>A local machine shop has it in the spare engine block core supply, and
>>>they
>>>offered it to me, since they don't do much in the way of V6
>>>engines.
>>>
>>>I looked it over and it is a Roller Cam block, and at this price I find
>>>it
>>>cheap enough to buy for a possible candidate to build a Supercharger
>>>specific shortblock.
>>>
>>>I just wonder if there are any differences over the 3.9 production run
>>>in how these blocks were cast.
>>>
Magnum heads won't fit on premagnum motors and vise versa. I believe
the differences are semi-subtle. Bolt patterns, water passages etc...
stuff doesnt line up between the premags and magnums from what I
understand. Thats why you never hear of anyone putting magnum
production heads on a premag block. The heads also use different bolt
patterns for the intake manifold. Premag intake manifolds bolts are at
an angle and at different positions - magnums are horizontal and more
uniformed in pattern.
The blocks all should accept the same motor mounts between premag and
magnum. That is pretty standard between 3.9, 5.2, and 5.9 engines. As
long as you can determine if the 3.9 core you have is 92 or newer, you
should be able to use it. I *think* 91 Daks had magnum 3.9's - I know
they had premag 5.2s.
-- -------------------------------------------------------------- "Why don't you ask me what it feels like to be a freak?"Terrible Tom -- AIM & Yahoo Name: SilverEightynine
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