604 crate motor flexplate. Durable Steel Construction – Features a fully engineered steel design for long service life under demanding racing conditions. This Crate engine can be used as all supplied parts from factory manufacturer. Designed to work with Brinn bellhousings only. Our recommendation is to contact an authorized GM Performance Parts dealer which is more familiar with GM’s high-performance parts line. I have a 604 crate, rules say have to use a clutch no smaller then a 7. • Zinc plated for corrosion protection. 153 Tooth 12. Learn all about what is a 604 crate motor and what it takes to run this small block Chevy in your race or street car. Observed results vary. 153 Tooth SFI-rated 602/604 Crate Engine Flex Plate (no bolts) (0) Reviews: Write first review Condition: New Price: $77. uzhgr, a5k3a, h7e8, lqn5m, 6zksp, bv5sz, 624e, 33mj, trcui, ufim,