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Old 12-28-2004, 04:20 PM
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can some one desktop dyno this for me

383
10:1 compression
041 heads 1.94/1.5
Isky Hyd 280 megacam
stock rockers
Performer Rpm manifold
Afb 625cfm

Thanks

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Old 12-28-2004, 04:39 PM
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with those heads your looking at about 375 ft. lbs @ 4000 RPMS & 321 HP @ 5000 RPMS.
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Old 12-28-2004, 06:26 PM
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do you think you could try it with a 750 CFM carb

Something is limiting it I rember hotrod did one with the same heads same intake and the cam was only slightly meaner then mine and it had 350Hp and 420 pounds of torque for mine to be down nearly 50 pounds of torque and it being at a higher rpm is scarey
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Old 12-28-2004, 06:28 PM
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You need better heads.Thats whats limiting your hp.BM
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Old 12-28-2004, 06:40 PM
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That carb is enough for a 383 to 5500 RPMs... problem is the heads.
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Old 12-28-2004, 06:50 PM
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I know the heads limit it
But they are still one of the best factory castings They are the same as camel bumps http://www.hotrod.com/techarticles/79478/index.html
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Old 12-28-2004, 07:01 PM
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dont believe every thing you read in a magazine first off. secondly, camel backs , although not bad...arent so great.
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Old 12-28-2004, 07:29 PM
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Is there a specific reason you want to use those heads?You need some darts or afr's to make that 383 scream.bm
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Old 12-28-2004, 10:36 PM
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Thanks for the effort But you must have done something wrong someone on another board just told me
332HP at 4500 rpm and 421 ftlbs of torque at 3500
which seems alot more on track

thank you though

And the reason I am running those heads is because I have them If I decide to go with new heads I will definately go for a set of darts
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Old 12-29-2004, 05:42 AM
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I ran almost your setup but used a 600 Edl & a Comp 280 with nice rockers.

411 Ftlbs@3000
336 HP @4700

You might ask on the other board which carb and cam they actually used.
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Old 12-29-2004, 05:31 PM
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There will be differences between programs as well, so find out exactly which program and version is being used. You can expect a 10% deviation from what the program shows, usually minus because the programs don't take climate and elevation into account, but I have seen a couple combos that came out up to 5% above the estimate. The important thing to remember is dyno programs are just estimates based on known performance parameters. They can't take everything into account.
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Old 12-29-2004, 06:55 PM
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Desktop Dyno 2000
I don't know what the heads specified flow at, so I chose "wedge, pocket porting" with the valve sizes provided.
cam had duration specified, 108 degree lobe center, "auto select" valve lift. as$uming "large tube headers with mufflers" for exhaust. Regardless, here's my specs.

625cfm
HP 386@5500
TQ 423@4000

750cfm
HP 392@5500
TQ 426@4000
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Old 01-08-2005, 02:06 PM
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Accuracy?

"Thanks for the effort But you must have done something wrong someone on another board just told me
332HP at 4500 rpm and 421 ftlbs of torque at 3500
which seems alot more on track

thank you though"

And who's to say the 'someone' on another board is accurate?
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