I'm quite sure Sonny's flow checks all his heads and intakes, here's an ad from his site


GM Hemispherical Heads
Designed and Fully CNC Machined By Sonny's
Home About Us Engines Induction Heads Accessories Apparel Ordering Customers
2007 SAR/BRODIX BB-5 400 CC OVAL MAX FLOW HEADS



At SAR all head porting is done in house. We use a state of the art 5 axis CNC vertical machining center, which can produce precision work to programmed "blue print" specs.

The BB-5 heads are the largest intake port BBC head castings, with raised port aluminum cylinder heads recommended for 565 cu. in. and larger engines, with capabilities of sustaining 600 + cu. in. Other features include replaceable step bronze guides, 2.350" x 1.900". Custom Sonny's heart shape chamber design is also incorporated in this cylinder head.

* LABOR

• CNC machined castings

• Install/fit bronze guides

• Machine for larger valves

• Precision, multi-angle valve job and equalize seat depth

• Full competition port, polish and flow test

• Hand contoured by one of our cylinder head experts

• Machine for Vasco-Jet springs and teflon seals

• Mill for compression

• Pressure check

• Correct spring height and assemble

•

•

PARTS

• Manley "Severe Duty" stainless steel valves

• Manley titanium 10 degree retainers

• Manley 10 degree hardened locks

• Manley hardened spring cups

• Manley Vasco - jet springs

• Manley 8740 rocker studs

• Comp guide plates

• Teflon valve seals

• 11/32" bronze guides

• Chamber volume 113.5 cc

• In. runner vol.: 400 cc

• Ex. runner vol.: 149 c.c.

• Peak in. flow: 445 cfm @ .900” lift

• Peak ex. flow: 311 cfm @ .800" lift with 28" H20
Fully race prepared CNC ported castings $4,075.00
Race ready fully assembled heads $4,920.0

Sonny doesn't have or use a flow bench, sure does have a lot of flow numbers in his ads!!!!!!