RTS’ full billet steel flexplates are for the serious racers. They are machined out of cold-drawn AISI 1045 carbon steel and come with a stealth black oxidised plating for added durability. Their strength to weight ratio is incredible compared to their 2-piece counterparts which enables them to handle extreme engine builds in excess of 1000 HP. They offer heat-treated, precision machined gear teeth for added strength and feature low runout values to produce an incredibly durable flexplate. They all come with a SFI 29.2 explosion-proof rating. Specifications: Concentric machined to .005". One piece design - 100% machined. Chamfered gear tooth provides better engagement. Fits GM LS engines with 6 bolt crank. 168 tooth ring gear. Converter pattern 1: 3 holes 7/16" diameter on 10.75" bolt circle. Converter pattern 2: 3 holes 7/16" diameter on 11.50" bolt circle. Converter pattern 3: 3 holes 7/16" diameter on 11.06'' bolt circle. Will not suit 8-bolt crank (LSA)