ballpark rpm?

why cast iron and not aluminum heads? just curious...

as far as how high you can take it? i wouldn't go any higher than 6k. it depends on how the cam is setup to tell you where your peak power will be though
 
When I inherited the car that's what was on it...once I get some extra cash I may go aluminum. First thing's first...I also inherited a leak :bang:

But, I'm pretty sure that's coming from the lower intake gasket. It's being torn down right now and I just found out that he did some porting and polishing on these World heads. I always thought they were just stockers :shrug: ...the things you learn