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10-21-2007, 09:30 PM
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#1 |
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Registered User
Join Date: Aug 2007
Location: Central Michigan
Posts: 42
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396 Hp?
Does anyone know what the HP rating on a 396 BB in a 1969 GMC is? I'm fairly sure my engine isn't stock because the serial number on the engine has been ground out. . . Isn't that sometimes done on a modified motor? In fact there's no markings at all on the motor, but hard core GMC buffs have said it was a GM BB. The previous owner really didn't know anything about it. He was a staright up collector and surprisingly, knew very little about the truck. He "thought" it was a 396 that had been bored out to a 402 (?) Of course it has a Endlebrock intake, Holly carb, headers, and flowmasters on her. . . The door plate DOES say it came with a "396" so I'm assuming that's what's in it, so I'm just curious what the OEM HP rating was. I'll put it on a Dyno next summer. It's my first "muscle" vehicle and man, it flat out screams (and sounds good doing it!!)
Thanks guys. This is really a great board. . . 
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10-21-2007, 09:42 PM
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#2 |
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Registered User
Join Date: Sep 2006
Location: League City, Texas
Posts: 732
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Re: 396 Hp?
A little hard to read but this might help if your engine was stock...
It is for 1970 trucks but shouldn't be much different than 1969. http://brochures.slosh.com/ Last edited by Texasdeere; 10-21-2007 at 10:38 PM. |
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10-21-2007, 11:14 PM
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#3 |
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Senior Member
 
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: 396 Hp?
310 Gross HP @4800,242 Net @ 4000.
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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, stereo speakers, 2nd owner, Work-Truck supreme. Last edited by WorkinLonghorn; 10-21-2007 at 11:49 PM. |
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10-22-2007, 07:23 AM
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#4 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
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Re: 396 Hp?
If the deck was shaved the numbers would get planed off.
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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10-22-2007, 08:43 AM
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#5 |
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Senior Member
Join Date: Dec 2006
Location: Studio City, Calif.
Posts: 2,883
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Re: 396 Hp?
Here's a little better shot of a somewhat blurry zerox of the original 1969 dyno tests you can use as a baseline.
__________________
'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, stereo speakers, 2nd owner, Work-Truck supreme. |
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