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Old 11-30-2005, 05:34 PM
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desktop dyno please

350 bored .040 over
ported 58cc heads, no i don't got anything about flow yet
lunati voodoo 268/276 duration, and .489/.504 lift
10.3:1 compression, h345np pistons
holley 650 dp
performer rpm intake,

if i left anything out just tell me, please dyno this
2.02/1.6 valves or 1.94/1.5

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Old 11-30-2005, 05:40 PM
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Im gonna guess that with the big valves it will be right around the 400 mark. Hg
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Old 11-30-2005, 05:40 PM
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Quote:
Originally Posted by 82c10
if i left anything out just tell me
Exhaust/headers?
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Old 11-30-2005, 09:03 PM
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Quote:
Originally Posted by Parisienne66
Exhaust/headers?
1 5/8" headers, with 2 1/2" exhaust w/ flowmaster 40 series mufflers, also will have a 2500 stall, and a turbo 350 behind it, i am also thinking about taking it back out of the truck to change to the cylinder heads to the ported 305's, i might even go get it balanced
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Old 11-30-2005, 11:05 PM
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HemmiGremmie was right on. Here it is w/ the stock valves


Ands here it is w/ the larger valves


Valves add ~15hp.
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Old 11-30-2005, 11:46 PM
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How can you tell with no flow numbers much less intake port volume? are these 58cc vortecs or the older style 283 heads? the 305 vortecs will make 350 on a good day and the 283 power pacs will make about 315 with the mildest of port jobs.
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Old 12-02-2005, 12:28 AM
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Re-read the original request. The man asked for a Desktop Dyno readout, not a numerical simulation. I think everyone realizes the limitations of DD, that it doesn't have all the physics to perfection. I used the obvious option of "Wedge/Pocket Porting, Stock Valve Size" from DD's drop-down option list. They do give the option for using a custom air flow file but not too many shade tree mechanics have access to a flow bench to create the data. I have found over the years that little program is fairly good for ballpark guesstimates and great for playing around with the effects of various parametric changes on engine performance. Anything beyond that and he needs to step up to one of the ++$10,000 finite element programs.
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