4P K-Series oil pump for high rpm applications. Also available for B-Series, H22, and EVO X http://www.4pistonracing.com/k20-k24-ported-type-s- oil-pump | By 4 Piston Cylinder Heads | Facebook
Ported oil pumps, what you need to know. – Bad Guys
Pics of Ported LS6 Oil Pump? - LS1TECH - Camaro and Firebird Forum Discussion
FF Side Mounted 5-Port Oil Pump, 1.125 inch Scavenge Stage | Pegasus Auto Racing Supplies
AH Engine – Porting the new oil pump for better flow. – the garage of love