Note 1: Because of supply problems regarding the size and fit, we manufacture our retainers to fit the production run of springs. For this reason the retainer sizes listed may vary slightly. This provides the critical fit from spring to retainer required to stop harmonics and spring chatter. We cannot assure you that others or even previous production runs of our retainers will provide the proper fit. If replacing a set of our springs be sure to have the retainer measurements when ordering so we can assist you in making the proper purchase. SEE GBK kits (previously listed) part numbers for properly matching combinations. Note 2: All inner and outer or triple springs require head machining. GB 272A requires that the head be welded in the intake port spring boss area, re-porting and machining. Use GB 706 tool and space out the blade to achieve this larger diameter (1.445") or purchase GB 706CH blade. Note 3: For many applications we have found that captivating the spring at the head end will increase life and further stop harmonics. See LA HEAD320 for welding in spring retaining cups. |