Here we have a pair of dart #11710040P aluminum pro1 230cc runner SBC heads. These were used for a very short time on the dyno, then the customer decided to do a cylinder head change. I reveivrd them, had them pressure checked, surfaced and cleaned.
I installed a new comp cams #927 springs, comp cams tool steel retainers, Manley hardened 10” locks, and biting valve seals. The springs are good up to .700 lift solid roller cam, with 225lbs of seat pressure, 500lbs open, and a rate of 498 lbs./in.
They have 2.08/1.600 stainless severe duty valves, 64cc chambers, 7/16 ARP rockers studs, and Isky 3/8 guide plates.
These heads are new/fresh, with a new valve job and valves were just lapped in, making them ready to install.
