Product Features:110cc combustion chamber with 290cc intake runner2.19 in. intake and 1.88 in. exhaust valvesOval port heads will support over 540 HP with 9.5:1 compression when used as part of the Total Power PackageSemi-open chamber design maximizes efficiency with streetable compression ratiosSmaller-than-stock 11/32 valve stems promote excellent flow and lighter valve weight
