Porting DC Stage IV iron heads

I had Jim and Cody Laroy prepare these Stage VI new castings for me. They are P5249579 Max Wedge Stage VI. This is the results.
Pretty impressive IMO.


ROY RIVEIRO STAGE VI HEADS



LIFT……...…OOTB INT /EXH Ported INT/EXH

.100…….…………61/58 77/70

.200……………...124/115 160/135

.300……………...188/149 224/184

.400………………232/156 273/220

.500….….….…..256/162 311/254

.600………….……257/165 335/271

.700……………….261/168 346/288