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desk top dyno numbers

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Old Oct 23, 2007 | 07:42 PM
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Dustin_86's Avatar
Dustin_86
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Question desk top dyno numbers

could someone please run this combo in thier desk top to see where i'm at.
78 block
ported/polished head
chevy rockers
comp 252* 4x4 truck cam
straight up timing gears
a 40k volt coil.
long tube headers
offenhouser 4bbl intake
holley 390cfm

can I make my 200hp 350ft/lb goals?
thanks,
dustin
PS I'm trying to decide on an engine build
 
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Old Oct 23, 2007 | 08:30 PM
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with your numbers plus 4 deg advance on cam
336lbs at 2000
205hp at 3600
VE of 79.2
These numbers are calculated at the flywheel.
 
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Old Oct 24, 2007 | 08:00 AM
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Using the Comp 260 with stock rockers will probably get you about the same lift as the 252 with the chebby rockers.
 
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Old Oct 24, 2007 | 11:12 AM
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jonbass,
thanks a bunch.
That will be the build then.
Using the formula eng tq x tire size x rear gears it should be enough motor to gross about 18k lbs with 4.56 gears. That's perfect.
PS I want to run an aftermarket OD, what is the better unit US gear, gear vendor.
Dustin
 
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Old Oct 24, 2007 | 01:04 PM
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gear vendor is a little more, but it alows you to shift on the fly. If you are running a t18 this will give you 8 gears instead of 4. It mounts after you trans or transfercase so you cant use it in 4x4 but i cant think of any reason you would need overdrive in 4x4 anyway.
While you are at it I would consider upgrading the brakes some, or at least inspecting all of the lines. you dont want to have a problem with them when you are towing 18k lbs. (don't ask why i would know)
 
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Old Oct 24, 2007 | 01:55 PM
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yes I already have a post about discs on rear and a dually brake booster and master cylinder. I hear if you put a dually booster on a SRW truck it helps braking tremendously, but what master cylinder?
The truck is a 78 f250 dual pistion caliper, with a 300 I6, it has the brake lines comming off the passanger side of master cylinder
 
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Old Oct 24, 2007 | 02:32 PM
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I cant really help you with that one but I would be interested to see how it truns out. I imagine the mounting flanges are all the same so i think you could keep your master and just switch the booster, but I cant say for sure
 
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