The KRE Aluminum D port Pontiac cylinder head has been on the market since 2004. This is the first D port head on the market to incorporate the latest developments in cylinder head technology into it. They feature the standard Pontiac exhaust arrangement; Saving you lots of money not having to buy a set of round port headers. These heads can be used with stock Pontiac exhaust manifolds or with standard d-port headers.

The heads are cast from 356-T6 aircraft aluminum and are nearly half the weight of a stock cast iron head. They come with hardened steel seats, and bronze alloy guides. The deck thickness is 5/8″ and they sport a new high efficiency heart shaped combustion chamber. The spark plug location angle has also been improved upon to create a very efficient chamber burn. Stock port heads have an approximate runner volume of 185 cc while the fully ported 340 cfm version have an approximate runner volume of 225 cc.

65cc chamber

These heads feature optimized oil return passages for increased oil flow.  Three heart shaped combustion chamber sizes are available : 65cc, 74cc and 85cc. The 65cc combustion chambers are as-cast while the 74cc and 85cc chambers are fully CNC’d.   The chamber on these heads is SO EFFICIENT we are able to run compression ratios of 11.5 to 1 AND SILL RUN ON 93 octane PUMP GAS!  The spark plugs have been relocated closer to the exhaust valve for improved performance as well. The heads are available in varying CNC port options. Complete heads include guide plates, rocker studs and high quality valvetrain for direct bolt-on application.

The heads are designed to use all of your stock D port head parts! (except your head bolts / head studs – see recommended installation items) Intake and exhaust valve centers are in the stock locations as well. These heads were designed for easy iron head replacement. These heads will bolt to ALL traditional Pontiac blocks and do not require you to run any off-set lifters or rocker shaft systems. They were designed to pick up where the stock D ports leave off; Taking you to that next level of performance!

Improvements:

• Oil drain backs are positioned to allow for a more complete draining back of the valve cover area preventing oil from standing on the valve seals
• Pushrod tubes are designed to accommodate 1.65 rockers without grinding on the heads
• Ports have a thick roof, wall, and gasket material areas for performance port work
• Exhaust port is standard Pontiac D-port configuration
• Utilizes standard pushrod location for 5/16″ pushrods
• Stock ports flow of approximately 260 cfm on the intake
• Come standard with 2.11 intake valve and 1.66 exhaust valve
• Standard valves are Ferrea 5000 series valve with a  5.100 length
• Valve angle is 14 degrees (stock pistons will work)
• Heads can be used on your 1965 – 1979 Pontiac motor with displacements from 350 – 455 cid
• CNC’d combustion chambers available on 74 cc and 85 cc chambered heads
• CNC ported options of 290, 310, 325 and 340 cfm

As Cast 85 CC D Port Head flow numbers