big block heads, getting them rebuilt/upgrades

[supersize75k5]

I am trying to finish up the motor on my 71 project, I want to upgrade to a lopy cam and thuse requires some more head flow,


so to build a bad a$$ set of big block heads where do i start???

any advice or exp is helpfull, I want some nice new heads but those are pretty spendy for aluminum

 

[k20]

049/781 set of heads, put in large valves, 2.19/1.88 or 2.25/1.88 if you are going really big. Either Chevy Hi-performance or Car Craft magazine, did a flow test between the 049's and the LS6's(of 1970 vintage) heads, and the 049's, with the large valves flowed better.

I got my 049's off ebay for like $175, then enlarge the valves and if you are ambitious, port match em, theyll flow all you need unless you are planning a 9500rpm race motor.

 

[Burt4x4]

Yup, on my 454 I have 781's with oversized stainless valves.
I just ran this engine again yesterday and Raaaappp Raaaaaap RRaaaaaaappp

Is sounds angry
Next step is to actually drive it

Here is a pic: