Related Photo Galleries
We took off the intake, headers, coil packs, valve covers, rockers, and pushrods to access the head bolts. When we put it back together, you'll see the DOD (Displacement-On-Demand) lifter valley cover (notice the veins) was replaced with a flat (no veins) non-DOD LS2 valley cover. DOD removes the oil out of the stock DOD type lifters so the valves don't open in the respective cylinders for fuel savings. By eliminating the DOD we'll be able to run LS9/CTS-V lifters and say goodbye to the valve float we were experiencing above 6,300 rpm.