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Factory Horsepower numbers?
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diecast92
New User
| Posts: 1
| Joined: 08/04
Posted: 08/07/04
05:54 AM
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Can anyone tell me where I can find the factory horsepower numbers for a 1971 350 out of a 1971 GMC 2500 4X4 truck with a four speed tranny? I'm struggling to find it. Thanks in advance!
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gearman
Enthusiast
| Posts: 270
| Joined: 08/04
Posted: 08/27/04
03:25 PM
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I remeber a 71 impala i had was 245 two barrel and 275 4 barrel remeber theese are gross figures and after 72 they went to net hp.
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Posted: 09/02/04
03:58 PM
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check out this site im sure you will find something here
www.nastyz28.com/sbchevy/sblock.html
get the casting #s from your block first
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gearman
Enthusiast
| Posts: 270
| Joined: 08/04
Posted: 09/13/04
04:44 AM
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Just for the hell of it what is the h.p of it? If you look in a chilton book the engines in the trucks always seem to have like 10 more horsepower.I dont know why ,it could be the exhaust or they may get a different cam I always wondered why?
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Posted: 09/24/04
04:47 PM
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It could be that truck motors came with heads that have better flow and bigger runners. but i'm not to sure
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Posted: 09/26/04
05:41 PM
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250 hp is the only 350 listed in my truck manual
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gearman
Enthusiast
| Posts: 270
| Joined: 08/04
Posted: 09/30/04
05:36 AM
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Some trucks had factory hard valve seats .Remeber lead
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Posted: 09/30/04
12:34 PM
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hello gearman
my shop manual (G M )
shows only one 350 for the c-10/c-20 truck 2 or 4 wheel drive ...
for that year...
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gearman
Enthusiast
| Posts: 270
| Joined: 08/04
Posted: 09/30/04
05:05 PM
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Are you sure it is a 350?It could be a 307 or a 400.I mean could it have ben swapped somewhere down the line? Want to check the casting #s?
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