Fresh ported n-351 heads from ford racing. Fits SBF 260-351
55cc chambers
2.05 manley intake valves
1.60 manley exhaust valves,
Isky springs for a solid flat, hyd flat, or hyd roller camshaft....
10 degree moly retainers and locks and teflon seals....
professionally ported: flowbenched 275cfm at .650 lift on the intake and 225cfm at .650 lift on the exhaust
heads are fresh with no miles or run time since assembly...