A little info about NASCAR Cylinder Heads you should know. First of all, all Winston Cup and Busch cylinder heads are cast of aluminum alloy and they’re a great bargain if they suit your application. Just about every engine builder uses the very best performance components available. For example, the porting job is usually CNC machined from a computer engineering design that costs millions. Del West Titanium valves and retainers are used almost exclusively. Isky “Tool Room” or equal valve springs are used. Most Intake and some Exhaust valve seats are of an exotic metal called Beryllium (an aerospace alloy), for greatest heat transfer and durability. About the only valve train assembly (rocker systems) used are Jesel or TD and are of the shaft mounted design. Most all engine builders use specially fabricated valve covers with spray oilers for the valve springs. These heads cost a typical Winston Cup or Busch Team over $14,000 to build but that’s where the big HorsePower numbers come from. A few caution comments when buying NASCAR Heads. There’s a lot to know about the value (or lack of value) of a particular head. A lot of heads are discards that didn’t work out while others are specific design for a specific purpose (such are restrictor plate engines). These may not be a real bargain especially if you can’t get THE matching intake manifold. In many cases, the intake manifold is of equal importance to the heads when it comes to performance. Only a competent engine builder that knows the head and intake design can match the two components and get maximum performance. There’s more to know than just “flow numbers” (what the heads flow in cfm). Combustion chamber size, intake runner size, intake runner location and angle, valve location and more are all things important when you spending thousands of dollars. |
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