SM Head Modifications on a budget
Not going to spend much time on this post other than to mention it. I cut the exhaust valve seat about 0.030" deeper to make the face of the exhaust valve flush with the intake valve. I also radiused the corner of the exhaust valve. I really thought there was going to be a 1-2 cfm gain because the exhaust valve was 'shrouding' the intake in a very highly active zone. Picture shows the exhaust valve sticking up into the flow zone before sinking. Pretty much nothing. Move on.
Not going to spend much time on this post other than to mention it. I cut the exhaust valve seat about 0.030" deeper to make the face of the exhaust valve flush with the intake valve. I also radiused the corner of the exhaust valve. I really thought there was going to be a 1-2 cfm gain because the exhaust valve was 'shrouding' the intake in a very highly active zone. Picture shows the exhaust valve sticking up into the flow zone before sinking. Pretty much nothing. Move on.