I pulled off my heads to do some minor porting. when i took a flashlight to the port to size up the work i noticed on two of the runners these huge (maybe a 1/2 inch wide to 1/2 inch deep) indentations. its obviously from the casting process, but man thats got to have a nasty impact on flowing.

 

you'd be amazed at the lack of quality control. I pulled a Buick 350 out of a buick I had, because it spun a bearing. When I started tearing it down, I removed the intake, and guess what? One of the intake runners was only open enough at the head surface to stick a pencil in. Needless to say that cylinder was dead weight. You'd be surprised at what the general has allowed to be "OK" What castings are you porting? I wonder if that's normal?

 

WOW....thats crazy... how the hell did the motor even run.

Im porting the intake runners but im taking the casting flaws off....alot of unecessary bumps in the runners....