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steponmebbbboom
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PostPosted: Thu Apr 07, 2005 3:20 pm 
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Shrouding relief?

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SlantSixDan
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PostPosted: Thu Apr 07, 2005 5:45 pm 
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Is this the original 62 engine that you are working on? The early ones could be bored out to .060, no more. The later blocks however used a thinwall casting that could only be bored out to .030.
Neither of these two points sounds correct to me at all. Where'd the info come from?
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At .090 I think you will probably break into a water jacket.
Doc and others have bored \6 engines 0.100".

The aluminum block can only be bored 0.040" in stock form -- I wonder if maybe that's what you were thinking of.

To determine the cubic inch displacement, use the following formula:

(½bore)² × π(stroke) × (number of cylinders)
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Dennis Weaver
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PostPosted: Thu Apr 07, 2005 6:34 pm 
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I believe there is an advantage to a larger bore when using large valves.
Good point.

The /6 in my Duster is bored .060, simply because the original owner insisted on an unnecessary rebuild and boring the block (.040") @ 90,000mi (car has almost 250,000mi now). I know this since I am friends with the machinist that did the work way-back-when. At .060", I have experienced no cooling problems whatsoever.

D/W

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steponmebbbboom
PostPosted: Thu Apr 07, 2005 7:48 pm 
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I believe the block was cast for aluminum and that it will usually withstand boring up to .100, or at least .090.
I think this was the comment that threw a couple people, including myself, into a loop. Can you sleeve an aluminum block?

Tiger, the slant was originally, in its earliest stages, planned as an aluminum block, as far as I know. It is this overbuilding to compensate for the expansion/contraction rates of aluminum, that is responsible for the durability this engine offers. As I understand it. But as pointed out, the production aluminum block differs greatly from the iron block.

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slantzilla
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PostPosted: Fri Apr 08, 2005 4:09 am 
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If you have not bought pistons yet, bore it as big as you can get pistons for. The larger bore will allow the head to flow better. The small bore of the Slant is a natural deterrent to good flow. :shock:

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Jeb
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PostPosted: Fri Apr 08, 2005 7:14 am 
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Is this the original 62 engine that you are working on? The early ones could be bored out to .060, no more. The later blocks however used a thinwall casting that could only be bored out to .030.
Neither of these two points sounds correct to me at all. Where'd the info come from?


A Mopar performance book on six cylinder engines and the info is on page 269.

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slantzilla
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PostPosted: Fri Apr 08, 2005 9:52 am 
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A Mopar performance book on six cylinder engines and the info is on page 269.
You will find quite a few things in the Mopar information that is not correct. Much of their information was designed to fit what they sold at the time, not what you could really do.

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SlantSixDan
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PostPosted: Fri Apr 08, 2005 10:02 am 
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A Mopar performance book on six cylinder engines.
That would explain the incorrect info, then.

Kesteb? Got your ears on?
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