Highest flowing sbm heads?

If you get a good set, numbers have appeared in the 330 area. Mine went 312 on a 4.125 bore. The head gage up the ghost and needed epoxy.

More than 300 cfm is big flow? OK, then in the right hands, any aluminum head and the W2 are capable.


I agree.
I would think a set of Indy 360-1 or 360-2 should take care of anything a stock block can handle?
Yep. Indy 360 heads go past 300 and will bolt up to your stock block.