Allstar SFI-approved flexplates are available for small block Chevy engines. Gold iridite plated, SFI-approved plates meet 29.1 specs., are .035" thicker than stock and have dual (10-3/4" and 11-1/2") converter bolt patterns unless specified. SFI flexplates have ring gears welded on both sides. These flexplates are used for IMCA 602 & 604 Crate Motors. 153T & 168T Flexplates available.