EFI Connection's 58x crankshaft reluctor was designed to generate the 58 pulse crank signal required by the GM Gen IV LS-Series ECMs. This reluctor is 4 inches in diameter and must be used with an EFI Connection billet aluminum timing cover. Its profile was designed for both single and double roller timing chain clearance.
IMPORTANT! Cannot be used with production GM 1996-newer SBC and LT1 timing covers due to crank seal backstop interference.
IMPORTANT! Cannot be used with production GM 1996-newer SBC and LT1 timing covers due to crank seal backstop interference.