All new GM Metric frame sections. IMCA and USRA approved. Available as front, rear, or complete front/rear frame kit. Race-ready modifications already made to frames. Identical dimensional specs to 78-88 GM Metric frame mounting points. .118-inch thick mild steel front frame rail sections. .120-inch thick mild steel rear frame rail sections. .095-inch thick 2x4 midframe rails (included with front frame and complete frame kits only) Front and rear frames feature dimple stops and alignment holes for assembly and welding ease. Don't Build Your Next Stock Car With a 30-Plus-Year-Old Frame With the last production GM Metric chassis frame hitting the road in 1988 it is no doubt getting tougher to find a suitable chassis for a competitive Stock race car build. Rust, accident damage, and more claim these GM Metric chassis frames every day. Our IMCA and USRA Stock Car rules approved GM Metric chassis Stock Car frame is the perfect answer to your next Stock Car chassis build! It is available as a weld together front frame stub (with midframe rails included), weld together rear frame stub, or complete weld together frame kit (front stub, rear stub, and midframe rails), perfect for Stock Car chassis builders. Designed in-house at Speedway Motors, these new mild steel frame stubs solve the growing problem of trying to source good used GM Metric chassis frames for your Stock Car builds. These are designed around factory frame dimensions, yet most of the modifications and updates you would have to make to a stock frame are already expertly handled and approved by IMCA and USRA Stock Car rules. This includes shortened front and rear frame horns, front crossmember “duckbill” removed for additional steering linkage clearance, and much more! Final assembly and welding are all that is required for Stock Car chassis builders and the alignment holes and dimple stops make welding everything together quick and easy