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So I have my engine build in Desktop Dyno 2k3, and I have been hunting for new heads. Just for grins, I put the 165 head specs in the program. With the 185s it shows 447hp/437tq. When I put the 165s in the spot for heads, leaving all other variables alone, I get an output of a whopping 503hp/456tq. Surely I am doing something wrong here.

Anyone care to double check me?
4.040 bore, 3.500 stroke, cr with both heads is approx 10.35
Comp Cams 275 DEH hydraulic flat tappet cam
1.7:1 rockers
Edelbrock RPM Airgap (high flow dual plane) intake
Holley 4160 650 cfm carb
Hooker Super Comps, for the purposes of this exercise, assume open/no mufflers or using cutouts.

If this does check out, is this actually a flaw in the calculations of the program, or will a smaller head produce more power? It stands to reason that is may, given that it will create a higher air velocity, but surely there aren't 50 ponies tucked away in there.
 

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Contributing Sr Motorhead
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On the AFR website, I see flow charts for both a 165 street head and a 165 race head. Same deal for 185s. I suppose it depends on which flow numbers you're using. But, assuming you are looking at the 165 street heads, and not with DesktopDyno2000 but the free CompCams CamQuest6 software, I see 465hp @ 6000 and 455 lb/ft @ 4500.
 
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