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FITS small block Chevy 283 305 327 350 383 stroker and 400 as well as 396 427 and 454 big block Chevy-based engines. REQUIRES THE USE OF an external CD capacitive discharge ignition box available separately. INCLUDES an adjustable slip collar that will adjust up to 1.5 inches and gives you the flexibility for a perfect fit. HIGH QUALITY CNC ALUMINUM BODY provides years of trouble-free operation. FEATURES Hardened steel shaft with a sealed ball bearing on top and a sintered steel bushing on the bottom fully adjustable mechanical advance and high-output circuit board module with digital tachometer output.Hardware > ToolsJEGS