Sierra Carburetor Kit 18-7070 for Rochester 2BBL, 1964-1983 MCM GM 4 & 6 Cyl Engines

The Sierra 18-7070 Carburetor Kit is a rebuild kit for the Rochester 2BBL carburetor used on 1964-1983 MCM GM 4 & 6 Cylinder marine engines. It is built to restore correct fuel metering and idle performance in carburetors that have gone soft, worn, or dried out from ethanol-blended fuel and normal service life. Sierra engineers this kit to meet or exceed the specifications of the original equipment part it replaces, so the rebuilt carburetor performs to factory tolerances once assembly is complete.

This kit is intended for boat owners and marine technicians rebuilding a Rochester 2BBL carburetor rather than replacing the entire unit, which keeps rebuild cost down while restoring reliable starting, smooth idle, and consistent throttle response. Sierra supplies OEM engine manufacturers and boat builders with marine parts every day, and this carburetor kit is manufactured to the same standard used in that original equipment supply chain.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7070
• Product Type: Carburetor Kit
• Compatible Carburetor: Rochester 2BBL
• Compatible Engines: 1964-1983 MCM GM 4 & 6 Cylinder Engines
• Weight: 0.28 pounds
• Included Components: 1 Carburetor Kit
• UPC: 030999320964

Fitment

• 1964-1983 MCM GM 4 & 6 Cylinder marine engines with Rochester 2BBL carburetors

Replaces (OEM)

• 1397-2072
• 1397-7542
• 1397-2637
• 1397-7543
• 1397-8872
• 1397-3464

Frequently Asked Questions

What carburetor does the Sierra 18-7070 kit fit? The Sierra 18-7070 is a rebuild kit for the Rochester 2BBL carburetor used on 1964-1983 MCM GM 4 & 6 Cylinder marine engines.

Will 18-7070 work on any GM 2-barrel carburetor? No, the 18-7070 kit is designed specifically for the Rochester 2BBL carburetor on 1964-1983 MCM GM 4 & 6 Cylinder engines, not for GM 2-barrel carburetors generally.

What OEM part numbers does the Sierra 18-7070 replace? It replaces OEM numbers 1397-2072, 1397-7542, 1397-2637, 1397-7543, 1397-8872, and 1397-3464.

How much does the 18-7070 carburetor kit weigh? The Sierra 18-7070 Carburetor Kit weighs 0.28 pounds.

Is the Sierra 18-7070 a full carburetor replacement or a rebuild kit? It is a rebuild kit, not a complete carburetor, intended to restore a Rochester 2BBL carburetor rather than replace the whole unit.

Does Sierra 18-7070 meet OEM specifications? Yes, Sierra engineers the 18-7070 kit to meet or exceed the specifications of the original equipment part it replaces.

Is there a similar carburetor kit for a different Rochester application? Yes, Sierra also offers the 18-7075 kit for a different Rochester carburetor application, which uses a separate part number and replaces a different set of OEM numbers, so confirm your carburetor before ordering.

What is included in the Sierra 18-7070 kit? The kit includes one carburetor rebuild kit for the Rochester 2BBL carburetor, part number 18-7070.

What symptoms indicate my Rochester 2BBL carburetor needs the 18-7070 kit? Rough idle, hard starting, and inconsistent throttle response on a 1964-1983 MCM GM 4 & 6 Cylinder engine with a Rochester 2BBL carburetor are common signs that a rebuild with the 18-7070 kit is needed.

Is the Sierra 18-7070 kit genuine OEM or aftermarket? The 18-7070 is a Sierra-brand aftermarket kit engineered to meet or exceed the original equipment part it replaces, identified by the OEM cross-reference numbers 1397-2072, 1397-7542, 1397-2637, 1397-7543, 1397-8872, and 1397-3464.