Mine are really std lifters. Not low or high bleed. John sent me this
Correct valve lash adjustment for low-bleed (short-travel) hydraulic lifters requires extreme precision, typically setting preload to a very light
1/8 to 1/4 turn past zero lash, rather than the standard 1/2–3/4 turn, to prevent holding valves open due to limited internal plunger travel.
Key Considerations for Low-Bleed Lifters
- Minimal Preload: Because low-bleed/short-travel lifters have very little internal travel, excessive preload (e.g., 3/4 turn) will cause the valve to be held open, resulting in misfires and poor performance.
- Zero Lash Precision: "Zero lash" is defined as the point where all vertical movement and slack are removed from the pushrod, and it begins to feel slight resistance when spun with your fingers.
- Target Preload: The industry standard for these specialized lifters is often 0.002"–0.004" or exactly 1/8 to 1/4 turn past zero, ensuring a stiff valve train that performs like a solid lifter.