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12677005 dual 45 bend LT4 high pressure fuel line
12618337 Is another version of one listed above. It has one 90 and one 45. It comes on LT1, L83, L86. If you use the one above you won’t need this one
12663577 is LT4 hpfp feed that doesn’t have the orifice check valve like the original SS LT1
12677002 S shaped line between rails. I believe it’s used on all engines. If you’re just wanting to change all lines to eliminate the chance of a leak
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