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Old 02-25-2013, 08:38 AM
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BBC build hp? 1/4 et?

ok guys i would like some help I'm building a 454 with aluminum heads 320cc, a 550 lift cam forged pistons 10-1 cpr high rise intake holley 850 carb. with a built 350 turbo tranny 2500 stall and a built rear end with 3.73 i would like to know how much hp i would be making and what my 1/4 mile et would be in a 4700lb truck and any suggestions to make changes in the build any and all help will be appreciated

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Old 02-25-2013, 10:13 AM
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not enough information ,so lets start at 500 hp or less and high 13s
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Old 02-25-2013, 11:53 AM
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For some odd reason, it's common for folks to "list" the lift numbers but not duration. I'd like to request when posting detail, PLEASE give the camshaft brand, lift, duration (@.050" tappet lift) and LSA (lobe sparation angle). Each cam grinder has their own "method" of measuring seat "time", so the "@.050" numbers give us a more accurate comparison across brand names. One can tell a whole lot more about power capability with the duratoin numbers than lift. Hydraulic? Solid? Flat? Roller?

Need the brand name of the heads, flow capability, actual displacement, intake type and header size. Then I can give you a fairly accurate estimate of power.

Jim
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Old 02-26-2013, 04:46 AM
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I think you are over estimating the weight. 4700 is the gross weight for a c10 short bed and is 3700 is the empty weight, then add another 200 for the BBC and 200 for the driver. 4100 pounds would be a better estimate.

Assuming 500hp at the crank and 4100 pounds I would say the truck should have a trap speed of 110 mph. This should be around a high 12 second 1/4 mile in a truck with street tires.
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Old 02-26-2013, 07:48 AM
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One of our friends and customer, has a '79 GMC "C" 1500. It has a 400SBC we built here. TH350, 3.73 rear and a 2,800 RPM converter. The engine makes right at 500 HP, MAYBE 475 lb. ft. The truck goes consistently, 12.20s and has been 12.08 with "good air". He's still working on traction, as 60' range is around 1.8-1.9. He's adding the CalTracs system as we speak. It weighs 4,125 lbs. with him in it ("race weight"). 93 octane. We expect some 11 second times early this season.

Just some "real world" results of an engine in the power range being discussed, in a similar vehicle. I would give the big block the "edge" at the same horsepower, due to better torque production.

FWIW

Jim
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Old 03-04-2013, 12:13 AM
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thank you guys and i was thinking a lunati voodoo cam not sure which one im gonna get yet. im gunna have 3in true duals, not sure on the suspension yet and im gunna be running drag radials
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Old 03-04-2013, 12:15 AM
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and today i traded that 350 turbo for a th400
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Old 03-04-2013, 04:41 AM
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what year truck?

I would avoid an ultra fast ramp flat tappet cam, especially in a BBC. That means voodoo or extreme series.

Look at the compcam 280H or 286H. A little slower ramps than the voodoo or extreme, a little less power, but much less likely to go flat.
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Old 03-04-2013, 05:29 AM
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its a 89 single cab short bed chevy with full interior and thank you for the advice on that cam im glad i didnt order one yet
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Old 03-04-2013, 05:45 AM
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but im thinking im gunna go with the 286H rpm range 2200-6200,duration adv. both are 286 @.050 both are 236, valve lift at 1.7:1 both are .556, Lobe sep. angle is 110 degrees, Valve settings hid
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Old 03-04-2013, 05:49 AM
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by the way im hoping to push around 500+ hp
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Old 03-04-2013, 08:46 AM
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500 hp

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Originally Posted by Short-Bed Chevy View Post
but im thinking im gunna go with the 286H rpm range 2200-6200,duration adv. both are 286 @.050 both are 236, valve lift at 1.7:1 both are .556, Lobe sep. angle is 110 degrees, Valve settings hid
seriously?
consider using a roller cam and a well thought out engine.All parts matching,,,,
list what you have,cr and deck height if you want serious HP
could go 12s with proper thought
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Old 03-04-2013, 09:45 AM
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To make that power, I like the 292h but with a 10" 3000 stall.
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Old 03-04-2013, 11:33 AM
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all i have is the stock tall deck motor with the th400 and i was just trying to see what to get before i start buying and also so i can a matching motor and i was thinking a solid roller at first and my dad and i were kinda throwing around the idea of a 150 shot
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Old 03-04-2013, 11:42 AM
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figure out your budget first
quality parts
how often its driven
purpose etc
Be reasonable with power. A powerful BB will destroy stock driveline pieces or blow the tires off everytime you nail it.
Lets figure out the purpose of the vehicle,then add in the driveline improvements to get you there.
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