| [GMCnet] Differences between a 403, and a 455. [message #283248] |
Mon, 27 July 2015 00:05  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
|
Senior Member |
|
|
From what I think I knew. Since the 403 is a small block. Thus has parts in common with the Olds 350. Shouldn't the 403 be shorter then the 455 big block from the center line of the crank to the top of the block were the intake sits. On my 78- 403 the air cleaner is up against the engine cover. And I've seen this on other 78- 403's. So I must be wrong. I found a 350 Olds Edelbrook alum intake manifold that I want to install when I finally put my EFI on. Should that intake fit?Bob Dunahugh
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Differences between a 403, and a 455. [message #283251 is a reply to message #283248] |
Mon, 27 July 2015 03:28  |
appie
Messages: 902
Registered: April 2013
Location: denmark
Karma: 2
|
Senior Member |
|
|
There are different aircleaners. That is different in the way they fold around the carb making total height different
Appie
eleganza 76 "Olga" now sadly sold
6 wheel discbrake
Quadrabags
Springfield stage 2 462 olds
Manny tranny
( pictures at http://www.gmcmhphotos.com/photos/g6489-olga.html
Fulltiming in Europe july 2014 til july 2016
Denmark
|
|
|
|
| Re: [GMCnet] Differences between a 403, and a 455. [message #283276 is a reply to message #283248] |
Mon, 27 July 2015 10:46 |
winter
Messages: 247
Registered: September 2007
Location: MPLS MN
Karma: 0
|
Senior Member |
|
|
Which intake are you looking to install? Performer, performer rpm?
I put a performer on my 77 10 years ago and it seems to fit fine. There isn't any extra room to the engine hatch though.
I also plugged of the exhaust crossover and put in an electric choke when I switched intakes. The choke was a little work to get dialed in but this is also the only carb I've really worked on.
The rear AC support didn't want to fit back in after I changed intakes but I don't recall what the issue was.
Jerrod Winter
1977 Palm Beach
Green Jelly Bean
Twin Cities, Minnesota
|
|
|
|
| Re: [GMCnet] Differences between a 403, and a 455. [message #283281 is a reply to message #283248] |
Mon, 27 July 2015 11:25 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
|
Senior Member |
|
|
BobDunahugh wrote on Mon, 27 July 2015 00:05From what I think I knew. Since the 403 is a small block. Thus has parts in common with the Olds 350. Shouldn't the 403 be shorter then the 455 big block from the center line of the crank to the top of the block were the intake sits. On my 78- 403 the air cleaner is up against the engine cover. And I've seen this on other 78- 403's. So I must be wrong. I found a 350 Olds Edelbrook alum intake manifold that I want to install when I finally put my EFI on. Should that intake fit?Bob Dunahugh The 455 intake manifold is sort of concave. I am going to guess the 403 intake manifold is sort of convex. That'll raise the carb, and therefore the breather.
[Updated on: Mon, 27 July 2015 11:26] Report message to a moderator |
|
|
|
| Re: [GMCnet] Differences between a 403, and a 455. [message #283380 is a reply to message #283248] |
Tue, 28 July 2015 11:29 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
|
Senior Member |
|
|
BobDunahugh wrote on Sun, 26 July 2015 23:05From what I think I knew. Since the 403 is a small block. Thus has parts in common with the Olds 350. Shouldn't the 403 be shorter then the 455 big block from the center line of the crank to the top of the block were the intake sits. On my 78- 403 the air cleaner is up against the engine cover. And I've seen this on other 78- 403's. So I must be wrong. I found a 350 Olds Edelbrook alum intake manifold that I want to install when I finally put my EFI on. Should that intake fit?Bob Dunahugh
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
The 455 in the GMC used a low profile intake while the 403 used a regular RWD passenger intake. So, even though the 403 is lower, the regular intake uses up that extra room.
Bob de Kruyff
78 Eleganza
Chandler, AZ
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
