Our BBM assembled head will come standard with high quality stainless steel 11/32″ stem valves. Intake valves 2.200, and exhaust valves 1.650  diameter.
We offer assembled heads in two configurations. For Hydraulic roller application will come equipped with beehive springs on ID locators,  
10 degree retainers and locks,
and positive Viton seals.

Installed height 1.880 @ 155 pounds. Open pressure @ 1.280 height is 377 lbs.
Coil bind at 1.230. Springs are intended for a max lift of .600 inch, and adequate for hydraulic roller use.
Some flat lifter cams will be compatible with these specs, however, proper requirements and break-in are the responsibility of the end-user.

For milder flat tappet application we also offer a single spring with damper 110 lbs,
seat pressure with 285 lbs @ .500 lift, max lift of .550 inch. This package  comes with 10 degree steel retainers, locks,
and positive Viton seals. 
Consult  with your cam manufacturer about compatibility.

If using solid or hydraulic flat tappet lifters, consult the cam manufacturer of your chosen camshaft to insure these specs are suitable for your use.

*Please discuss with your professional engine builder for your application needs.