This is where I would take my heads.
Hi-Flow Heads
Cylinder Head Hand Porting and Machining
Contact Mike Hally @ 708-396-0505
Alsip, IL
These guys reworked my heads, they do first class work.talk to tony @ aes in elk grove ..... 847-956-1244 .... http://www.aesracing.net/
SBC heads.3800 heads?
no, its a steel beehive retainer. i worked on the head some last night. its an art trying to get the right shim, retainer, and locator to the desired install height. I finished all but one exhaust valve because it was 0.005" too tight.your not referring to a rotating retainer are ya? lots of sbc heads came with them