Description
Feuling – Rivera 4 valve heads for Evolution engine with exhaust headers . These heads can be used on either stock 3 1/2″ bore or big bore 3 5/8″ cylinders.
The heads are very low time and in excellent shape, almost like new. One head has some dings in the chamber from a flat washer. Long story short it was sabotage. The bike was started for a split second and was immediately shut down. Other than the couple dings, no bent or damaged valves, guides, seats or anything. All that stuff is like new. The customer was pissed off at the shop and threw a fit and wanted them gone so I took a chance and grabbed them up.
These heads should be installed by expert engine builder. They will need to be taken apart so that some of the head bolts can be put in for assembly. Valve stem seals will need to be installed also. You might want to surface the dings out of the one head if using on 3 1/2″ stock cylinders. While they flow good as is, a serious builder would also see that they can be ported some.
These heads originally had a dual Delorto pumper carbs set up on them. In the install video you can see they used a single carb, so they can be dual or single carb. There are new gaskets and seals for the rocker boxes and intake. A low lift, long duration camshaft is recommended. Pistons will probably need to be notched. If you build you engine right with these heads you will have something unique, good looking and reliable.
