Originally Posted by ap72
If you want velocity (which isn't always a good thing) then you may want to look into methods of fillin gyour ports with epoxy. Stock BBC ports (more so than SBC ports) can benefit from adding some material in the right places. Its very important to do it properly though and use the right material as you don't want it coming loose and going into your cylinder.
expoxy ports are for race engines only and it does fall out and go thru the motor usally doesnt do any damage but still not good.
velocity is always good until you get to the point where turbulence starts. At about .7 of mach speed of the air fuel charge. up until that point you want to speed up the intake speed as much as possible.
BBC usally you can go smaller ports if the shape is good so picking the good casting numbers is very important. also the exhuast ports are usally small on BBC heads and usally require more work than sbc heads.