WR Stock Replacement Cylinder Heads for the 356/912

Finally, an improved cast reproduction of the factory type 616 cylinder head. No more fixing cracks and modifying 50+ year old heat cycled original heads that will probably just crack again.  Developed and produced by Willhoit Auto Restoration, these new castings solve the 356/912 cylinder head problem with a replacement that looks and performs better than the original.

Features:

• Cast just like the original heads but using a proprietary alloy and heat treat process that will not crack. The prototypes were extensively tested on the WR engine dyno and on the street. The flow through finning cools the ports and chambers for a cooler running head that will produce more power.
• The smaller DR6EA plug is 12mm x ¾” reach and allows for much more material around the valves. It is a commonly used plug size and is easily available. Four new plugs are supplied with each set of heads. 
• The special WR Stainless Steel 8mm stem valves, made for us by Manley,  are 38mm intake and 34mm exhaust. The custom WR Locking Valve Guides are silicon-bronze alloy for excellent heat transfer and long life and are locked in place by our special WR Spring Pads. Port design is similar to original, but the use of the smaller valves and guides allows for improved flow (7% on intake, 3% on exhaust). 
• Special hardened lash caps provide a large pad for the stock rocker arms. A set is included with each pair of heads.
• Special WR bead lock Chromoly Retainers are matched to the custom WR double springs and WR Spring Pads which locate the inner spring are good for 7k RPM and lifts over .525" without coil bind.
• The 61.0cc matched chambers have a 30-degree bevel cut to be compatible with the later factory and aftermarket piston and cylinder kits. Intake and exhaust ports are the larger SC and 912 version. 
• Test on our in house Superflow 902S dyno shows an improvement over even the latest 356C/912 heads. Improvements compared to earlier heads will be more. 
• Completely assembled and ready to install and run. The WR Standard Cylinder Heads are a perfect replacement for early and late 356 and 912 engines. 

$3800/pair

Beware of copies. If they don't have the WR part number they aren't WR heads.