The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.
Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board > The 1973 - 1991 Blazers, Jimmys, and Suburbans Message Board
Reload this Page 454 or 350 how do i tell?

Web 67-72chevytrucks.com
Home Forums Gallery Site Merchandise Register FAQ Members List Subscribe Calendar Mark Forums Read


Reply
 
Thread Tools Display Modes
Old 11-14-2010, 10:26 AM   #1
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Exclamation 454 or 350 how do i tell?
I have a 1977 C20 burb 2wd 3spd and the plus are hortizonal in the head. I was told its a 454 and a 350? And help to tell what the motor is for sure?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 10:42 AM   #2
blazn79
Registered User
 
Join Date: Mar 2008
Location: Lowell, Massachusetts
Posts: 126
Re: 454 or 350 how do i tell?
Easy, the valve covers are about double the width size on a 454 than on a 350 and it should say on the emissions sticker on the the radiator support in
the top left corner if it still there!
blazn79 is offline   Reply With Quote
Old 11-14-2010, 10:46 AM   #3
GmtGmt
Conversion Truck Addicted
 
GmtGmt's Avatar
 
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
Re: 454 or 350 how do i tell?
this is a bigblock engine

This is a smallblock engine
__________________
Thomas

Quote:
Tonight mine pulled a few cars out of snowbanks, and is sitting in my driveway, icicles on the grille, wheels just white cakes of snow, buried up to the lug nuts in powder, straps and chains wrapped around the bumpers, the outline of the wipers clear in 4 inches of snow on the windshield... A tired warrior of the 1980s in a world of low profile tires, front wheel drive, and plastic bumpers, where people stay in their houses until snowplows move the offending substance from their paths, too helpless to travel without AAA and chains and salt, clearing their windows with longhandled brushes while gently stepping around in the snow trying to stay nice and dry.
GmtGmt is offline   Reply With Quote
Old 11-14-2010, 10:49 AM   #4
motornut
78K & 79C Jimmys
 
motornut's Avatar
 
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
Re: 454 or 350 how do i tell?
size matters lol
red 454 big block
blue small block 350
Attached Images
  
__________________
John
1978 GMCJimmy4X4-350/203
1979 GMCJimmy4X2-305/350
motornut is offline   Reply With Quote
Old 11-14-2010, 11:01 AM   #5
russgt
Registered User
 
russgt's Avatar
 
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
Re: 454 or 350 how do i tell?
I think he meant to say the opposite... Maybe the guy meant that its got a 454 and a turbo 350 trans.
__________________
70 stepside
76 blazer
86 Silverado
20 Max Trailering 6.2 Crew
71 Nova SS

My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634
russgt is offline   Reply With Quote
Old 11-14-2010, 11:10 AM   #6
GmtGmt
Conversion Truck Addicted
 
GmtGmt's Avatar
 
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
Re: 454 or 350 how do i tell?
Quote:
Originally Posted by russgt View Post
Maybe the guy meant that its got a 454 and a turbo 350 trans.
im leaning towards this too also if its 3 speed
__________________
Thomas

Quote:
Tonight mine pulled a few cars out of snowbanks, and is sitting in my driveway, icicles on the grille, wheels just white cakes of snow, buried up to the lug nuts in powder, straps and chains wrapped around the bumpers, the outline of the wipers clear in 4 inches of snow on the windshield... A tired warrior of the 1980s in a world of low profile tires, front wheel drive, and plastic bumpers, where people stay in their houses until snowplows move the offending substance from their paths, too helpless to travel without AAA and chains and salt, clearing their windows with longhandled brushes while gently stepping around in the snow trying to stay nice and dry.
GmtGmt is offline   Reply With Quote
Old 11-14-2010, 11:25 AM   #7
BigBlocksRule
Registered User
 
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
Re: 454 or 350 how do i tell?
If the exhaust ports/headers/exhaust manifolds are equally spaced, it's a big block...or an LS If there's a pair in the middle of the head, it's a smallblock.
BigBlocksRule is offline   Reply With Quote
Old 11-14-2010, 11:31 AM   #8
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
ill post some pics. maybe itlle help?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 11:32 AM   #9
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 11:33 AM   #10
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 11:42 AM   #11
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
its a 3/4 ton 8 lug, if that helps, what are the specs for the 454 and 350?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 11:43 AM   #12
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
77C20454 is offline   Reply With Quote
Old 11-14-2010, 02:43 PM   #13
russgt
Registered User
 
russgt's Avatar
 
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
Re: 454 or 350 how do i tell?
its a small block, need the casting numbers to verify the exact displacement. Also looks like the truck was originally yellow
__________________
70 stepside
76 blazer
86 Silverado
20 Max Trailering 6.2 Crew
71 Nova SS

My Blazer build http://67-72chevytrucks.com/vboard/s...d.php?t=363634
Last edited by russgt; 11-14-2010 at 02:44 PM.
russgt is offline   Reply With Quote
Old 11-15-2010, 10:08 AM   #14
77C20454
Registered User
 
Join Date: Nov 2010
Location: Davidson
Posts: 16
Re: 454 or 350 how do i tell?
ill have the casting around 4pm et
77C20454 is offline   Reply With Quote
Reply

Bookmarks

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 10:26 AM.

67-72chevytrucks.com - Archive - Privacy Statement - Top

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com