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11-14-2010, 10:26 AM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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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?
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11-14-2010, 10:42 AM
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#2 |
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Registered User
Join Date: Mar 2008
Location: Lowell, Massachusetts
Posts: 126
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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! |
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11-14-2010, 10:46 AM
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#3 | |
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Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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Re: 454 or 350 how do i tell?
this is a bigblock engine
 This is a smallblock engine 
__________________
Thomas Quote:
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11-14-2010, 10:49 AM
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#4 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: 454 or 350 how do i tell?
size matters lol
red 454 big block blue small block 350
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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11-14-2010, 11:01 AM
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#5 |
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Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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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 |
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11-14-2010, 11:10 AM
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#6 | ||
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Conversion Truck Addicted
Join Date: Sep 2009
Location: Denmark, Europe
Posts: 1,551
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Re: 454 or 350 how do i tell?
Quote:
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Thomas Quote:
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11-14-2010, 11:25 AM
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#7 |
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Registered User
Join Date: Jun 2008
Location: Lubbock, TX
Posts: 2,047
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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.
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11-14-2010, 11:31 AM
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#8 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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Re: 454 or 350 how do i tell?
ill post some pics. maybe itlle help?
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11-14-2010, 11:32 AM
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#9 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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Re: 454 or 350 how do i tell?
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11-14-2010, 11:33 AM
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#10 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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Re: 454 or 350 how do i tell?
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11-14-2010, 11:42 AM
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#11 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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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?
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11-14-2010, 11:43 AM
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#12 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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Re: 454 or 350 how do i tell?
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11-14-2010, 02:43 PM
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#13 |
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Registered User
Join Date: May 2008
Location: Waukesha, WI
Posts: 904
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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. |
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11-15-2010, 10:08 AM
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#14 |
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Registered User
Join Date: Nov 2010
Location: Davidson
Posts: 16
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Re: 454 or 350 how do i tell?
ill have the casting around 4pm et
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