Big block alumininium cylinder heads set of two bare 356 aluminium t6 heat treated 3 chamber 119cc 325cc intake runner 150cc exhaust runner flows strong to 6550 rpm flows up to 635 hp calculated at 15 inches 2.250 intake valves 1.880 exhaust valves bronze guide hardened valve seats improved combustion chamber shape for faster burn weight 17 kilo approx each head
