I'm a machinist and have a question for all you Honda guys. I have spent my life building big and small blocks. Building a Honda motor for my brother. I have a b18c1. I have port and polished the head and welded the combustion chambers with reshaping for more quench area. Here is the build...

P72-2 head fully worked and b18c1 block
Skunk2 Pro stage 2 cams
Skunk2 Pro springs and titanium retainers
Blox adjustable cam gears
Skunk2 intake (port matched with TB and head)
Skunk2 70mm throttle body
81.5mm bore
With piston and rods he has with reworked head calculated compression ratio is 11.3:1
Arp head studs
AEM fuel rail
Walboro 225 fuel pump
All GSR water, oil pump, timing belt
He is hoping to see over 200hp but finally to my question,

With this build can stock injectors sustain 200hp or will the duty cycle be pushing over 80%? This will not be a track car but a DD with enough power where he can stop worrying about one of my small blocks pulling up next to him and will most likely see more then 8500rpm a couple of times depending on what story the dyno tells.

 

You will need bigger injectors. At least 440 to be on the safe side. I have tune several 200 whp b series and the stock injectors usually run 100 percent duty cycle around 175-180 hp give or take.