The Stage 1 assembled BR1-13 package is right for you if you are looking for an affordable valve train for mild boost, nitrous or naturally aspirated hydraulic roller engines. We came out with this package for customers that cannot quite afford the stage 2 setup but want to get into one of the best cathedral heads out there! These heads are professionally assembled to include vacuum test on Serdi guide and seat machine, Spring pressures verified and install height set, valve stem heights set to equal lengths to assure the same pushrod length and even preload amongst all lifters which is critical in short travel lifters. Heads include Stainless Intake and Exhaust valves, BTR SK001 .660 spring kit with steel retainers
Average time to Assemble and ship these heads is 4 weeks
Minimum Bore Size 4.00"