Home » Public Forums » GMCnet » Overbore Size (Related to my engine failure)
Overbore Size [message #328505] |
Mon, 22 January 2018 14:12 |
Carl S.
Messages: 4186 Registered: January 2009 Location: Tucson, AZ.
Karma: 13
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Long story, but I have a full reciprocating assembly that I acquired from Steve Ferguson, that HE got from another GMCer who received it as part of a warranty settlement from Mondello. The only problem is that (I believe) it has .060 over pistons and rings. I am looking for opinions on whether or not this much of an overbore is an issue on a 455. If it is even questionable, I will try to work out some kind of a deal on those parts and go with about a .030 overbore.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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Re: [GMCnet] Overbore Size [message #328506 is a reply to message #328505] |
Mon, 22 January 2018 14:19 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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.060" is OK on the 455. .030" on the 403. If in doubt, have a sonogram
done on the block. Probably not a bad idea in any event.
Jim Hupy
Salem, Or.
On Jan 22, 2018 12:14 PM, "Carl Stouffer" wrote:
> Long story, but I have a full reciprocating assembly that I acquired from
> Steve Ferguson, that HE got from another GMCer who received it as part of a
> warranty settlement from Mondello. The only problem is that (I believe)
> it has .060 over pistons and rings. I am looking for opinions on whether or
> not this much of an overbore is an issue on a 455. If it is even
> questionable, I will try to work out some kind of a deal on those parts and
> go with
> about a .030 overbore.
> --
> Carl Stouffer
> '75 ex Palm Beach
> Tucson, AZ.
> Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive,
> Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American
> Eagles,
> Solar battery charging. GMCSJ and GMCMI member
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Re: Overbore Size [message #328538 is a reply to message #328505] |
Tue, 23 January 2018 10:31 |
kingd
Messages: 592 Registered: June 2004
Karma: 2
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On a LOT of engines 0.060" is probably over the RECCOMMENDED maximum.
Ken H. knows some engine people that could probably give a very educated opinion.
0.060" might work on a particular block but not on another of the same type/brand, etc.
Core shift.
Ken H's friend might also be willing to tell us about "core shift"
DAVE KING
lurker, wannabe
Toronto, Ontario, Canada
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Re: [GMCnet] Overbore Size [message #328540 is a reply to message #328538] |
Tue, 23 January 2018 10:52 |
powwerjon
Messages: 849 Registered: March 2013
Karma: -2
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Dave,
You are not that far from Dick Paterson up in Coldwater, ONT. You can reach him at 705 325-4554. He is the go to person on the 455 engine and the 403 too.
J.R. Wright
GMC GreatLakerTech Editor
78 Buskirk 30' Stretch
75 Avion Under Reconstruction
Michigan
> On Jan 23, 2018, at 9:31 AM, Dave King wrote:
>
> On a LOT of engines 0.060" is probably over the RECCOMMENDED maximum.
> Ken H. knows some engine people that could probably give a very educated opinion.
> 0.060" might work on a particular block but not on another of the same type/brand, etc.
> Core shift.
> Ken H's friend might also be willing to tell us about "core shift"
> --
> DAVE KING
> lurker, wannabe
> Toronto, Ontario, Canada
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Re: [GMCnet] Overbore Size [message #328541 is a reply to message #328540] |
Tue, 23 January 2018 11:18 |
jimk
Messages: 6734 Registered: July 2006 Location: Belmont, CA
Karma: 9
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It's worth the time to contact people like Dick Patterson as he is familiar with the 455/403
Sent from my iPhone
> On Jan 23, 2018, at 10:52 AM, John Wright wrote:
>
> Dave,
> You are not that far from Dick Paterson up in Coldwater, ONT. You can reach him at 705 325-4554. He is the go to person on the 455 engine and the 403 too.
>
> J.R. Wright
> GMC GreatLakerTech Editor
> 78 Buskirk 30' Stretch
> 75 Avion Under Reconstruction
> Michigan
>
>> On Jan 23, 2018, at 9:31 AM, Dave King wrote:
>>
>> On a LOT of engines 0.060" is probably over the RECCOMMENDED maximum.
>> Ken H. knows some engine people that could probably give a very educated opinion.
>> 0.060" might work on a particular block but not on another of the same type/brand, etc.
>> Core shift.
>> Ken H's friend might also be willing to tell us about "core shift"
>> --
>> DAVE KING
>> lurker, wannabe
>> Toronto, Ontario, Canada
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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Re: [GMCnet] Overbore Size [message #328547 is a reply to message #328506] |
Tue, 23 January 2018 15:58 |
James Hupy
Messages: 6806 Registered: May 2010
Karma: -62
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Keep in mind that .060" is only .030" on each side. Less than 1/32". The
455 is an "OLD SCHOOL" engine. SMALL bore, LOOONG stroke. Lots of meat
around the cylinders, and a really good casting with high nickel content.
Not much problem with "core shift" in these engines compared to "modern"
engines like 350 chev. Don't believe me? Ask Dick Paterson.
Jim Hupy
On Jan 23, 2018 9:18 AM, "Jim Kanomata" wrote:
It's worth the time to contact people like Dick Patterson as he is familiar
with the 455/403
Sent from my iPhone
> On Jan 23, 2018, at 10:52 AM, John Wright wrote:
>
> Dave,
> You are not that far from Dick Paterson up in Coldwater, ONT. You can
reach him at 705 325-4554. He is the go to person on the 455 engine and
the 403 too.
>
> J.R. Wright
> GMC GreatLakerTech Editor
> 78 Buskirk 30' Stretch
> 75 Avion Under Reconstruction
> Michigan
>
>> On Jan 23, 2018, at 9:31 AM, Dave King wrote:
>>
>> On a LOT of engines 0.060" is probably over the RECCOMMENDED maximum.
>> Ken H. knows some engine people that could probably give a very educated
opinion.
>> 0.060" might work on a particular block but not on another of the same
type/brand, etc.
>> Core shift.
>> Ken H's friend might also be willing to tell us about "core shift"
>> --
>> DAVE KING
>> lurker, wannabe
>> Toronto, Ontario, Canada
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Re: Overbore Size [message #328553 is a reply to message #328505] |
Tue, 23 January 2018 17:26 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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With the amount of work it takes to R and R an engine in a TZE, I would not want a + .060 in mine when pulling a long long grade over 6%.
I would put a meatier block in the MH and use that one in a Cutlass, 442, or 98 where long term heat loads are much lower.
John Lebetski
Woodstock, IL
77 Eleganza II
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Re: Overbore Size [message #328558 is a reply to message #328505] |
Tue, 23 January 2018 20:47 |
JohnL455
Messages: 4447 Registered: October 2006 Location: Woodstock, IL
Karma: 12
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I have a 10k engine that runs great so hopefully I won't be spending any money on it at all!
John Lebetski
Woodstock, IL
77 Eleganza II
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