This is why I am not in love with the 4" arm and limited CSA heads-REGARDLESS of flowrates. Wicked wicked street engine but very limited RPM for my likes. J.Rob
I love the arm, but not the readily affordable handicap heads we have to chose from.
Every sbm 4" motor I go straight to the pinch and divider wall and thin and widen as much as I can for a minimal rpm increase. 190-210cc starting point would be great...