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Home » Public Forums » GMCnet » Re: [GMCnet] engine change to 403
Re: [GMCnet] engine change to 403 [message #122510] Wed, 20 April 2011 16:03 Go to next message
sgltrac is currently offline  sgltrac   United States
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What is the easiest way to distinguish between the two visually?
------Original Message------
From: David L Greenberg
Sender: gmclist-bounces@temp.gmcnet.org
To: gmclist@temp.gmcnet.org
ReplyTo: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] engine change to 403
Sent: Apr 20, 2011 1:53 PM


On Wed, 20 Apr 2011 13:34:44 -0500 sgltrac <sgltrac@gmail.com> writes:
>
>
> I know I shoulkd know this by now but what year did they start
> putting the 403 in?
>
> Thanks,
>
> Sully
> 77 Royale
> _______________________________________________
Changeover began on Mar 1st 1977 with TZE167V101285 for GM finished
coaches and TZE337V101287 for Transmodes.



David Lee Greenberg
Port St Lucie, FL skype: david.lee.greenberg
Dedicated to the Preservation of the Classic GMC Motorhome
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Sully 77 Royale basket case. Future motorhome land speed record holder(bucket list) Seattle, Wa.

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Re: [GMCnet] engine change to 403 [message #122511 is a reply to message #122510] Wed, 20 April 2011 16:13 Go to previous messageGo to next message
gordh1   Canada
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5 bolts on the valve cover for the 455, 3 on the 403. Wink

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Re: [GMCnet] engine change to 403 [message #122524 is a reply to message #122511] Wed, 20 April 2011 19:14 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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Gord,

Sorry, close but no cigar!

The 455 has ten valve cover bolts; 5 across the top five across the bottom.

The 403 has 5; three across the top and two across the bottom.

Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Gord H
Sent: Wednesday, April 20, 2011 4:14 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] engine change to 403

5 bolts on the valve cover for the 455, 3 on the 403. ;)
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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] engine change to 403 [message #122528 is a reply to message #122524] Wed, 20 April 2011 19:38 Go to previous messageGo to next message
gordh1   Canada
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Registered: February 2011
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Robert Mueller wrote on Wed, 20 April 2011 20:14

Gord,

Sorry, close but no cigar!

The 455 has ten valve cover bolts; 5 across the top five across the bottom.

The 403 has 5; three across the top and two across the bottom.

Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426



Hmmm.... might want to have this picture pulled and Dick Paterson's note removed then?

http://www.gmcmhphotos.com/photos/showphoto.php?photo=26266

http://www.gmcmhphotos.com/photos/data/3619/medium/id_403.jpg

G Wink

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Re: [GMCnet] engine change to 403 [message #122531 is a reply to message #122528] Wed, 20 April 2011 20:06 Go to previous messageGo to next message
mike miller   United States
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5 bolts or 3 bolts _ON AN EDGE_ of the valve cover. Double that number if you wish to count the whole valve cover. But unless you are taking the cover off, why would you want to do that?

Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo' http://m000035.blogspot.com

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Re: [GMCnet] engine change to 403 [message #122533 is a reply to message #122528] Wed, 20 April 2011 20:09 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Gord,

Douh! First of all I screwed up!

This statement is correct:

The 455 has ten valve cover bolts; 5 across the top five across the bottom.

Here is a picture of a 455 valve cover:

http://www.gmcmhphotos.com/photos/showphoto.php?photo=28551

This statement is incorrect:

The 403 has 5; three across the top and two across the bottom.

It should read:

The 403 has 6; three across the top and three across the bottom.

I have no bloody idea how I came up with five, I haven't had anything to
drink; YET!

The picture is correct; it is talking about the number of screws across the
edge. Which is either 5 or 3 depending on the engine. Ten for the 455 and
six for the 403.

Regards,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426


-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Gord H
Sent: Wednesday, April 20, 2011 7:38 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] engine change to 403

Hmmm.... might want to have this picture pulled and Dick Paterson's note
removed then?

http://www.gmcmhphotos.com/photos/showphoto.php?photo=26266

G ;)


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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

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Re: [GMCnet] engine change to 403 [message #122534 is a reply to message #122533] Wed, 20 April 2011 20:15 Go to previous message
gordh1   Canada
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Registered: February 2011
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No worries mate - I didn't have a clue until I saw the picture and it stuck in my head as such a simple and quick method to spot one from another. I guess to that point we're lucky GM didn't choose to build all with 4 "per edge".

Gord Smile

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