SM Head Modifications on a budget

Shortly after these RPM copies came on the scene someone sent me one to see if there was any “low hanging fruit” for big gains in flow.

It was several years ago, but I remember my takeaway being, after the valve job and blow blend/SSR tweak are done……. which gets you into the 260’s……..that you have to do some meaningful actual “porting” to get much past that point.