This BluePrint Engines 168-tooth iron flywheel is engineered to pair perfectly with GM-compatible crate engines that use an external balance and a one-piece rear main seal. Designed for 11-inch clutch applications, it delivers smooth engagement, consistent power transfer, and the durability needed for street performance, restorations, and classic muscle builds. Built from heavy-duty iron and precision-machined for proper balance, this flywheel provides the confidence and correct fitment required when backing a fresh crate engine with a manual transmission.