Originally Posted by harleym

I have two sbc 406 engines with these heads(220). Make sure to use the stud girdle and offset rockers. They make very good power. Mine have the 2.10 intake and 1.6 ex valves. Aligning the rockers to the valves is a little tricky but easy to do. The correct pushrod length is very important. John @ Canfield is very helpful.