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1967-1974 GMC C25/C2500 Suburban
1987-1987 Chevrolet R20 350 CID
Engineered for low turbulence/restriction and maximum flow
25-inch mandrel-bent aluminized steel inlet pipe flowing into a Super 50™ muffler for a deep mellow tone
Mounting flange gasket type - O-ring
Cam Sync Kit, +.400 Raised Cam - 556-120 brake-hoses 1967-1974 GMC C25/C2500 SuburbanOverview: A cam sync signal is required to run sequential fuel injection. This tells the ECU which cylinder is cylinder #1 (or the first cylinder in the firing order as entered in the software). These kits were specifically designed to provide a "plug & play" cam position signal to Holley EFI systems, although they may be used with any EFI system which can read a digital, square wave input cam signal. They are intended for use with Big Block Chevy
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