SD Performance spends an extensive amount of time on the dyno, at the track and on the street to develop some of the best performing Pontiac ported cylinder heads on the market today. SD Performance has more 5 Axis CNC Porting and Combustion Chamber Programs for Pontiac heads then anyone and we are constantly working on more and improving existing programs in our never ending search for more pure Pontiac power. All of our heads are flow tested on our state of the art computerized Superflow 600 flowbench equipped with velocity probes, but we've learned that what really counts, is how our heads work in the real world. A flowbench is a great tool which we use daily, but there is more to an efficient head than just flow, too many put their faith in flowbench numbers alone.

All KRE D-port heads include:(unless stated otherwise)


Precision sized guides

High flowing multi angle valve job on our Rottler SG8 seat and guide machine

Ferrea stainless steel valves with multi angle cuts for better off the seat flow

Chrome moly retainers with 10 degree locks

Viton seals on intake and exhaust guides, for the best oil control available

Fully CNC ported intake and exhaust ports

Notched for 1.65 rockers

Improved oil drainback

Flow chart

ARP 7/16” rocker studs

Precision assembly - SD Performance precision assembly means, we test ALL valve springs on a digital spring tester, and set ALL installed heights individually to equalize the springs as close as possible.

Don't Forget, all Aluminum heads will not work with OEM head bolts and require new Head Bolts or Head Studs, we have ARP fasteners in stock from $82.95.