Dual Port Cylinder Heads, 35 x 32mm Valves, 500-400 (per PAIR) are a GREAT deal on stock sized valve heads for that engine project you are going to do! These are complete with Valves, HD Single Springs, Keepers, Retainers, bolt them on! These heads have combustion chambers of approx 59cc without modification
Price is for a PAIR of matching cylinder heads. These heads use 14mm x 3/4" spark plugs.
These are equipped with HD Springs, so they are perfect for cams up to around 290 advertised duration (Engle 110, SCAT C-35, etc). Bigger cams than this will need Dual Springs. These heads are a good choice if you are building a mild engine with a non-stock cam, since you would need to buy new HD Springs and Chromoly Retainers, removing the stock stuff. Why pay for stuff you are going to take off an not use? Use these instead, they have that already! Another beautiful feature of these heads is they do NOT have the #)*($)*& step in the combustion chamber, which causes NOTHING BUT PROBLEMS!