550 cubic inch bb dyno!

Thanks guys. When i built the headers years ago i read that a straighter exit for ren inchs or so allowed a smaller pipe. Making virtually identical power to the ceramic coated 2 1/4 dyno headers seems to bear that out.
This motor originally made about 860 hp as a 528 with 13.5 compression and an isky rr735 cam with the rest being the same. So adding 22 cubes, a point and a half compression and the skirt coatings really brought all the stars into line IMHO.
This was not so much a calculated change as it was "lets do what we can to up the power some". Offset grinding the crank from 4 .15 to 4.3150, cutting the heads for compression, and coating the pistons for the .0043 bore wear. Putting it on the pump was a good move. My starting tune was supposedly rich by 8 percent.
The tune starting point was .108 main bypass and .038 nozzles. A high speed bypass set to open at peak torque fuel pressure of 50 psi has a .064 bypass. I ended up at a .090 main bypass and power was still climbing the richer i went but i ran out of pills at .090. The BSFC ended at 1.05 roughly from peak torque of 5600 to 7200 peak hp. Two things i never would have known without the dyno session was what it wanted for a high speed bypass and where the power would be. My thinking was way off on both. Timing ended at 34.