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Old 09-18-2010, 08:55 PM
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Need Help With Hp/tq Estimates For 400 Sbc

Hello, I have a 400 small block that came from the factory with 255 hp and 390 ft/lbs(it's a 511 block and clk suffix code). Now I have done a few small upgrades and would like to hear what you think the power output would be now. I have installed a Weiand action+plus intake(#8004), a Comp cams 280H, Hooker headers, 4 barrel 650 cfm Edelbrock AVS carb sitting ontop of a one inch 4 hole carb spacer. i would love to be close to 300 hp power and 415 ft/lbs. i would like to hear from people that could tell me a very close estimate. This is for my sons birthday, I have been building it at a buddies house for 6 months. His old engine had a pretty nasty crack in the cylinder wall when we pulled the head. THANKS!

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Last edited by projectman69; 09-18-2010 at 09:09 PM.
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Old 09-18-2010, 09:33 PM
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Easily over 300hp, probaby even a little better than 375hp, easily 435 ftlbs torque. You have opened everything up with intake, cam, and headers, now it can breathe. It was really strangled in stock form.
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Old 09-18-2010, 09:33 PM
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Well if the engine is built and tuned correctly you should be well over 300 hp with the equipment you stated. You might get second guessed on the 650 carb instead of a 750 but if its not a race car then it should be fine for the street. Good luck with it, hope your son is a sensible kid with his right foot.
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Old 09-18-2010, 09:37 PM
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You've got 300hp easily. The stock intake and exhaust really hold the engine back. I like the 650 carb on it too. IMO 750 would probably be too big for a slightly modified engine like yours.
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Old 09-18-2010, 09:45 PM
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Lucky kid! I wish my dad got me a 400 when I was young!

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Old 09-18-2010, 10:45 PM
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That should be a good sounding motor that runs decently well, but the overall package might work more harmoniously with a slightly smaller cam and no carb spacer. Are the heads stock? Stock torque converter? What are the gears?
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Old 09-19-2010, 07:31 AM
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The heads are stock. i have i 2200 stall that i got and it has i think either a 3.42 or 3.73 something like that.
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Old 09-19-2010, 07:39 AM
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Quote:
Originally Posted by projectman69
The heads are stock. i have i 2200 stall that i got and it has i think either a 3.42 or 3.73 something like that.
I think that will work out pretty nice, you will likely find it to be better with a 1" open spacer because the 400 is bigger cubes than most SBC's with that intake.

Hope the car/truck it is going in doesn't have the small 7.5" rear(78-87 G-body, 82-up Camaro/F-bird, S-10's) This engine will punish one of those.
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Old 09-19-2010, 07:45 AM
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Quote:
Originally Posted by ericnova72
I think that will work out pretty nice, you will likely find it to be better with a 1" open spacer because the 400 is bigger cubes than most SBC's with that intake.

Hope the car/truck it is going in doesn't have the small 7.5" rear(78-87 G-body, 82-up Camaro/F-bird, S-10's) This engine will punish one of those.
it's going into a 82 gmc sierra. it doesnt have the 7.5" it's a different one from a chevy
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Old 09-19-2010, 07:47 AM
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Quote:
Originally Posted by ericnova72
Easily over 300hp, probaby even a little better than 375hp, easily 435 ftlbs torque. You have opened everything up with intake, cam, and headers, now it can breathe. It was really strangled in stock form.
Really? That would be awesome. He might have to share the truck with me!
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Old 09-19-2010, 07:47 AM
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Quote:
Originally Posted by projectman69
it's going into a 82 gmc sierra. it doesnt have the 7.5" it's a different one from a chevy
'82 sierra is a full size truck?? (I think?). Would be an 8.5", plenty strong.
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Old 09-19-2010, 07:50 AM
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Quote:
Originally Posted by ericnova72
'82 sierra is a full size truck?? (I think?). Would be an 8.5", plenty strong.
Ya that sounds about right.
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