Billet EN40B steel crankshaft made by Arrow Precision in UK. Modern technology and science make these cranks great products at a reasonable price. Featuring:
- Extra-large C-shaped counter weight webs to reduce vibration and to minimize main bearing wear, which is so critical with the Mini’s 3-main bearing design
- Through-bored rod journals for weight reduction and improved balance
- Nitrided EN40B steel to a depth of .020”
- Long keyway for improved location of crank gear and front pulley.
- Certified material, heat-treating and balancing
- Full crack-checking
- Fits 1300 and 1275 A+ blocks
- Main bearing width is 1.211” with 1.625” (Cooper S) rod journal
- Standard 81.3mm stroke as on all 1275 Cooper S and all 1300/A+ blocks
Note: This crank is not machined to fit a Cooper S block, only a 1300 series or A+ series block. These blocks are identified by having no removable lifter covers.