Features excellent performance and compatible with S&S Cycle EFI Designed for engine displacements 88", 95", 106", 111" & 124", also S&S T-Series Engines with stock head breathing Used with 4.937" length cylinders Manifold size 410 S&S style o-rings must be used with this manifold, S&S O-rings are thiner to accommodate the larger port diameter 402-800 or 404-378