I've been going back and forth with them, this is what they said specifically about the head work
We install larger 1.94”/1.50” valves, cut a three angle performance valve job on the seat and then blend the VJ into the bowl. This increases airflow quite a bit in the head and allows us to make the extra torque and hp
When I asked about the hp..
Yes the 270hp is rated at the crankshaft. This number is with a stock intake, throttle body, header and exhaust. If you upgrade to a 62mm throttle body, cold air intake, aftermarket header and exhaust you can make up to 300hp and 340 ft lbs of torque.
I'm having a hard time finding any real world dyno info, JP Magazine did dyno one though
http://www.fourwheeler.com/how-to/trans ... -engine-3/
At one point the article states
Part of the delay in getting our engine was the fact that we asked for the optional engine dyno break-in and power test from Golen Engine Service. Here's what our 91-octane pump gas beast belted out using 24-pound injectors, a Hesco adjustable fuel-pressure regulator, a 66mm throttle body, and a Hooker header.
It provides a table showing the break in dyno gave
324tq/268hp with the above mods
However, the chassis dyno results weren't super impressive
Golen Engine Supply 4.6L with Turbo City mods & Accel Injectors
RPM: Power: Torque: Air/Fuel Ratio:
3,500 149
224 11.9:1
3,600 152 222 12.0:1
3,700 154 218 12.1:1
3,800 155 215 12.1:1
3,900 162 218 12.1:1
4,000 165 217 12.0:1
4,100 167 213 11.9:1
4,200
172 216 11.8:1
4,300 167 204 11.8:1
4,400 164 196 11.7:1
4,500 161 188 11.6:1
4,600 162 185 11.5:1
4,700 163 182 11.5:1
4,800 164 179 11.5:1
4,900 161 172 11.6:1
5,000 161 169 11.6:1
5,100 158 162 11.6:1
5,200 147 149 11.5:1
5,300 123 121 11.3:1
Even with 25% driveline loss thats 215hp/280tq, they did mention their tune wasn't 100%. Thoughts? I'm slightly leaning more towards my build as I'm using the longer 4.0 rods, forged pistons and a 12cw crank. Apples to apples it will be relatively the same cost
