The Ultimate 1275 Race crankshaft to fit 1300 blocks. Machined from a 4340 steel billet, and nitrided. Fully counterweighted for smooth operation at high RPM. 1.625 (Cooper S) rod journal size. Cross-drilled. Generous radii on all corners. Even the C-ring groove has been omitted to remove the stress point. Custom fitting of your primary gear assembly will be required. Spacer ring shown may not be suitable for all installations.
See also SEN0053 Paul Ivey Cooper S crankshaft.