Highest flowing sbm heads?

RAMM said
I tried a BIG setup and made paltry 581 HP @417ci with them. IIRC IQ52 made 600+HP with the RHS's--I could never get there. J.Rob

RammerJammer75 said
I think it's a good head if you can get them for a deal, but I don't think you'll make over 500 without some work on them. Brian's might do it since he works them. Does he even sell them anymore though? I bought a bare set for $400 a few years ago, so I really like them!

Hey J.Rob,

Yes I bought set of them in 2010 and did a little work with them off and on until 7 years ago (2015). 2.05/1.625 valves, 250 cfm @ .400, 304 cfm @ .600". We used them on a 424.5ci/360 at 10.9:1 compression with a 258/260 solid roller, .680"/.688", 110 LSA 107 ICL. 572 LB-FT @ 4,800 rpm and 629 HP @ 6400 rpm on 91 octane pump gas. I was asked what it would cost to do another set and it came out to $10,000. No takers.