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The Moroso Ultra 40 ignition wire set for Chevrolet big block engines is an unsleeved non-HEI under-header kit finished in blue, designed for installations where wires must pass beneath headers. It matches big block non-HEI distributor and plug layouts, supplying the boot angles and lengths required for correct routing without changing existing connector hardware.
Moroso Chevrolet Big Block Ignition Wire Set - Ultra 40 - Unsleeved - Non-HEI - Under Header - Blue
