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10-25-2011, 03:46 PM
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#1 |
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Registered User
 
Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Horsepower Ratings
Is there a way to tell how many horsepower my truck's engine was rated for? It came from the factory in 1971 with a 350 / 4bbl. Were there factory options for more HP or are they all pretty much the same? How do I hunt down the original factory HP rating? Thanks for any help.
-Chuck 
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10-25-2011, 04:02 PM
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#2 |
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Registered User
Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Horsepower Ratings
That is an LS9 which was factory rated 255/355 hp/tq. (gross)
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Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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10-25-2011, 04:03 PM
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#3 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,855
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Re: Horsepower Ratings
The Truck Data Book for that year should have the info.
FWIW the 1969 350 4v was rated at 255 (Gross) @4600 RPM or 200 (Net) @ 4000 RPM. With the "A.I.R." Emissions pump it was rated at 195 Net
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'69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent. |
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10-25-2011, 04:06 PM
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#4 |
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Registered User
Join Date: Oct 2009
Location: Tampa Bay
Posts: 1,549
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Re: Horsepower Ratings
71, I found 250 hp and 350 tq on this website. It's a PDF file.
http://www.gmheritagecenter.com/gm-h...olet-Truck.pdf Scroll down to page 9. Your 350 is option LS9 on your SPID right? Also your engine assy stamp might tell. It's stamped on the block on a pad just in front of the passenger side head. Get the suffix code at the end. (last 3 letters)
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CHEVY/GMC VIN DECODERS Last edited by bruceman1968; 10-25-2011 at 04:07 PM. Reason: spelling |
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10-25-2011, 04:18 PM
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#5 | |
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Registered User
Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Re: Horsepower Ratings
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10-25-2011, 04:29 PM
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#6 |
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Registered User
Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Re: Horsepower Ratings
Apparently GM has recycled the LS9 nomenclature because this is what I get when I search the web for LS9 info:
The 2009 ZR1's LS9 engine develops 630 horsepower but actually has less displacement than the Z06's 505 hp LS7 engine (376 vs 427 cubic inches). Wouldn't mind having one of them... |
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10-25-2011, 04:45 PM
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#7 | ||||
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"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,921
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Re: Horsepower Ratings
"LS" engines nowadays are waaaayyyyyy different than the "LS" engines of yore...
 Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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10-25-2011, 05:25 PM
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#8 |
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Registered User
Join Date: Oct 2009
Location: Tampa Bay
Posts: 1,549
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Re: Horsepower Ratings
71, If you liked that you'll love this. This is the same website just a different page. From this page you can get to a pdf file for any year. Just scroll down to Chevrolet Trucks (all models not listed below) and click SHOW
http://www.gmheritagecenter.com/gm-h...tion-kits.html
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CHEVY/GMC VIN DECODERS |
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10-26-2011, 06:44 PM
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#9 | |
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Registered User
Join Date: Sep 2010
Location: Sullivan County, NY
Posts: 455
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Re: Horsepower Ratings
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