Trick flo heads or these
http://www.ebay.com/itm/AFR-1630-LSX-230cc-Mongoose-CNC-Ported-Cylinder-Heads-LS1-LS2-LS6-Large-Bore-72c-/280641551777?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A2007%7CMake%3AChevrolet%7CModel%3AImpala%7CSubmodel%3ASS&hash=item41578a3da1&vxp=mtr




