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11-10-2002, 10:52 PM
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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82 350 Hp?
What was the stock horsepower for an 82 gmc 350? I just installed an edelbrock performer plus cam, performer intake, and a 600cfm performer carb. Also, my heads were shot so i had to work with what I have and threw on a set of 305 heads with 1.84 I and 1.5 E valves. I did a compression test and I have between 160 and 175 psi. Is this way too high? What would be my new horsepower approx.?
Thanks for the help! 
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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11-10-2002, 11:43 PM
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#2 |
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Account Suspended
Join Date: May 2000
Location: IL
Posts: 0
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no thats not too high, the HO305 engines had 9.5 compression ratio, you wont have that much unless you have HO305 pistons, as long as you have regular 58cc 305 heads like the 144014416 ones, 1.84 valves are hurting your airflow, and so are the intake runners volumes of them. stock PSI otherwise is 150
Last edited by Fast68Chevy; 11-10-2002 at 11:47 PM. |
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11-11-2002, 01:00 PM
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Gentleman Jim Driver
Join Date: Nov 2002
Location: Poulsbo, WA
Posts: 1,553
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The 1982 LS9 (Vin A) 350 was rated at 165 Horsepower @ 3800 RPM and 275 ft-lb of torque at 1600 RPM.
Pretty mild by todays standards, but the mods you have made make a really big difference on these early 80's gas guzzling smogged down monsters. My guess would be that you are around 250 HP now. But that pretty much a SWAG.
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Joe '75 GMC Gentleman Jim '84 Chev C10 Short Wide - Super duper plain (manual steering, manual brakes, no dome light, no cig lighter) '85 Chev C10 Short Wide - Super plain Vortec 4.8 4L60E trans also: '81 K30, '83 C30 Crew Dually, '84 M1028 CUCV, '85 M1009 CUCV, another '85 C10 SWB, '89 R3500 Flatbed |
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11-11-2002, 01:54 PM
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BeWarE tHe eViL CrAnkTOe!
Join Date: Oct 2002
Location: Yukon, OK
Posts: 3,605
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Hey Fast 68....I thought stock was like 180psi??? or was it just for that motor?? 150?
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~Dave~ You can call me Mike, Mike Oxlong - 1986 Chevy SWB - Stock for now - 1986 Chevy Custom SWB *Stolen 6/26/05* - 1985 Chevy SWB SOLD - 1999 T/A Some mods  www.cardomain.com/id/ramairdave AIM Screenname - Jester84 |
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11-11-2002, 02:04 PM
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
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at the crank without water pump or alternoator or any of that crap those 350's were makin 239hp. With your cam+intake you should be up about 40hp. But then you have 305 heads, so Id say your right at about a stock 350, maybe just a tad better.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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11-11-2002, 02:51 PM
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#6 |
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MOTORHEAD!
Join Date: May 2000
Location: Devon AB, Canada
Posts: 849
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Just thought I'd add that I removed all of the EGR pollution crap, this probably makes a difference as well.
Thanks for all the help!
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82 GMC High Sierra VortecPro 496 12 Bolt, 3.42's AFR 265 Holley 850 Performer RPM Air Gap Hooker 2455's TCI Turbo 400 Super Street Fighter TRRC 12 Bolt Eaton Posi Mark Williams Axles Cal-Tracs Hoosier 30x10.5 Radial Slick Full weight long box pickup Current best- 11.33@117mph |
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