Where do the extra 41 horses come from?

[48ida]

Seems I might be missing out some horsepower! On the bench my engine came in at 152, and this other set up is claimed to have done 193.

I can see some obvious differences that might make engine 2 have a little more horses in the stable, but 41? Am I missing something guys?

My set up consists of this:

82mm Berg forged crank
90.5mm Mahle barrels & pistons ( total seal rings )
Engle FK8 cam with straight cut timing gears
Eagle race rods
040 cast cylinder heads ported & polished by Jeff Denham
valves 44 x 37.5
compresion 9.5 to 1
CB perfomance 1.4 ratio rockers
48 IDA's on skat trak ported maniolds
Pheonix 1 3/4 inch merged header with A1 Turbo muffler
Berg equaliser pulley

Vs. engine 2

76mm Revmaster Crank
94mm Cima Barrels and pistons
eagle 5.325” forged H beam rods
Fk8 Cam
Scat lifters
Scat 1.4 rockers
C/R 10:1
CB Performance street Eliminators 44x37 Valves / Ported By Jeff Denham
13 pound flywheel
Berg Chromoly push rods
Magnum Straight cut gears
MSD 6AL Ignition system
Pheonix 1-2/4” header
A1 Header
48 IDAS

[Brown-nose]

one was dynoed in the UK,the other in the states 

[Cheesepanzer]

While there are some critical differences (bore/stroke for example), I'm willing to bet the majority of it is related to different dynos.

The 76x94 engine combo would likely produce more hp where your 82x90.5 would produce more torque.  No telling about those heads, but I run Denham heads and know how well they flow.     You didn't mention your rod length in your 82 stroker, but check the rod ratio differences to account for some hp/torque differences.

Then there's the simple state of tune of each engine.  Timing, jetting, air/humidity, fuel, etc...