Engine specs? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

magnethead · 07-25-2005, 10:46 PM

does anyone have the factory HP and torque specs for a 1977 GMC C3500 camper special Sierra Classic 454? I'd like to know what our engine had stock..

and does somebody know if it was equipped with smog? ours isn't.

60-66 Nut · 07-26-2005, 11:11 AM

These are the numbers my book gives for a 1977 454:

454 - 245 hp @ 3800 rpm - 365 ft.lbs torque @ 2800 rpm

454HD - 240 HP @ 3800 rpm - 370 ft. lbs torque @ 2800 rpm

As for the smog equipment, we had a bunch(about 60) 76-79 Chevy and GMC 1 tons with the 454, and only the 79's had smog pumps, although I'm sure California models were different.

60-66 Nut

**Captkaos** · 07-26-2005, 11:15 AM

There won't be smog on a 77 1Ton.

454 stock was 240hp @3800 and 370lb/ft @2800

magnethead · 07-26-2005, 06:43 PM

cool thanks.

magnethead · 07-26-2005, 11:03 PM

just realized that with 30" tires, 4.10's, and a TH400, our truck is dead on the torque peak at 60 MPH.

Is the coincedence or did GM do the math and do that deliberately?

07-25-2005, 10:46 PM	#1
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	Engine specs? does anyone have the factory HP and torque specs for a 1977 GMC C3500 camper special Sierra Classic 454? I'd like to know what our engine had stock.. and does somebody know if it was equipped with smog? ours isn't.

07-26-2005, 11:11 AM	#2
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	These are the numbers my book gives for a 1977 454: 454 - 245 hp @ 3800 rpm - 365 ft.lbs torque @ 2800 rpm 454HD - 240 HP @ 3800 rpm - 370 ft. lbs torque @ 2800 rpm As for the smog equipment, we had a bunch(about 60) 76-79 Chevy and GMC 1 tons with the 454, and only the 79's had smog pumps, although I'm sure California models were different. 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

07-26-2005, 11:15 AM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	There won't be smog on a 77 1Ton. 454 stock was 240hp @3800 and 370lb/ft @2800 __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

07-26-2005, 06:43 PM	#4
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	cool thanks.

07-26-2005, 11:03 PM	#5
magnethead 7000 #'s of american IRON Join Date: Dec 2004 Location: north tx Posts: 883	just realized that with 30" tires, 4.10's, and a TH400, our truck is dead on the torque peak at 60 MPH. Is the coincedence or did GM do the math and do that deliberately?



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