These are machine shop fresh 440 heads that have been gasket matched and have the bowls blended,new 5 angle valve jobs, new seat and back cuts on the valves, all new comp springs retainers, amd locks. They flowed 200 cfm on the intakes before and flow 247 @28 inches of depression after. IF intrested please call 256-328-0830

 

what type of 440 heads are they? 906?

 

They are 452's. Also machined the guide boss down for a double spring and .531 ps seal.