GM 243 Head Max Ported Intake Flow
Everyone keep in mind raw flow numbers do not indicate a good head that makes power. It's all about airspeed and the fine details the porter takes to shape the port in such a way that can maximize both flow and speed. You can have a high cfm head that doesnt make power and a head with less cfm that makes great power.
I don't know what my heads flow but they are 799s I had ls3 light factory valves turned down to 2.05s installed and a good valve job and factory exhaust valves. I ported them. I know I pulled them after dynoed my car and just opened the chambers to unshroud the valves and re dynoed my car on the same Dyno and gained 16 hp from that. From what I've tested there are big gains in mid lift numbers just form working the valve seats. My car made 492 rwhp on ls2 bottom end so they do descent just didn't have this set flowed.
TECH Apprentice
Joined: Apr 2019
Posts: 365
Likes: 133
From: California
I recommend you leave the cumbustion chambers untouched and focus on the throat, the rocker stud boss, the valve guide boss, and the pushrod pinchpoint. Only the pushrod pinchpoint might leave you scratching your head. Those things will get your heads to flow.
