Actually,OU812/IMM Engines,got over 300 with a hand ported set,for a stroker build..,Car Craft,shown the pictures..they were NICE....(Ironically,..the member I sold my heads to,had Brian flow them..(IMM....)
Wow that is very impressive. And must have taken some seriously intense time and effort. Hughes standard CNC porting does 300 cfm. And we know how accurate CNC is. To reach the same level by hand take's a lot of talent, time and dedication.
If his X head's aren't ported. Even porting to 260-270 CFM with that cam, he will pick up at least 50 horse. At least.
I'm looking at porting my head's this winter, aiming for 260-270 cfm around .550-.600 lift. And then going solid roller to match. And I'm HOPING to make 475 horse. EXPECTING minimum 450, coming from 400-420 I'm making now. So with how much more is into his combo. He can really only expect much better results from better heads with more porting.
