| [GMCnet] 403 to a 455 [message #203922] |
Sun, 07 April 2013 11:12  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Chevy also had a 400 small block with the same water jacket set up. Never seemed to be a problem there. It was a engine that was used in a lot of hard racing, thus lots of heat. There is a lot of water in that area. And were their together. It's fairly small. Bob Dunahugh
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| Re: [GMCnet] 403 to a 455 [message #203927 is a reply to message #203922] |
Sun, 07 April 2013 12:01  |
James Hupy
Messages: 6806
Registered: May 2010
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What most of the engine builders do not like about siamese cylinders is the
fact that in most circumstances, it is a limiting factor in how large an
overbore you can accomplish. Engines that have evenly spaced cylinders can
USUALLY be over bored and sleeved, but the back to back design of a siamese
prohibits sleeves unless you mill two flat sides on adjoining sleeves. If
you do this, they don't stay round and straight in high horsepower engines.
Probably why Joe M. did not like them. But, that said, the oversquare
design of the 403 makes it a favorite of mine, and Migel and several
others, in motorhomes.
Jim Hupy
Salem, Or
78 Gmc Royale 403
On Apr 7, 2013 9:12 AM, "Bob Dunahugh" <yenko108@hotmail.com> wrote:
> Chevy also had a 400 small block with the same water jacket set up. Never
> seemed to be a problem there. It was a engine that was used in a lot of
> hard racing, thus lots of heat. There is a lot of water in that area. And
> were their together. It's fairly small. Bob Dunahugh
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] 403 to a 455 [message #204016 is a reply to message #203927] |
Mon, 08 April 2013 08:43 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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I agree Jim. When I built my 352 stroker (400 w/Ford rods) we sonic tested
6 blocks before we found a 400 we could bore to .030 over. I have built
many 400's with no cooling issues. Just have to remember those steam holes
in the aftermarket heads.
Steve
On Sun, Apr 7, 2013 at 10:01 AM, James Hupy <jamesh1296@gmail.com> wrote:
> What most of the engine builders do not like about siamese cylinders is the
> fact that in most circumstances, it is a limiting factor in how large an
> overbore you can accomplish. Engines that have evenly spaced cylinders can
> USUALLY be over bored and sleeved, but the back to back design of a siamese
> prohibits sleeves unless you mill two flat sides on adjoining sleeves. If
> you do this, they don't stay round and straight in high horsepower engines.
> Probably why Joe M. did not like them. But, that said, the oversquare
> design of the 403 makes it a favorite of mine, and Migel and several
> others, in motorhomes.
> Jim Hupy
> Salem, Or
> 78 Gmc Royale 403
> On Apr 7, 2013 9:12 AM, "Bob Dunahugh" <yenko108@hotmail.com> wrote:
>
> > Chevy also had a 400 small block with the same water jacket set up.
> Never
> > seemed to be a problem there. It was a engine that was used in a lot of
> > hard racing, thus lots of heat. There is a lot of water in that area. And
> > were their together. It's fairly small. Bob Dunahugh
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
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--
Take care,
Steve
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