PMO Venturi Set 40mm x 38mm, 6 Pieces — Brass | Porsche 911 (PM-O180-5)

Venturi size is one of the main things that matches a set of carburetors to an engine. This genuine PMO (Performance Machined Originals) PM-O180-5 set gives you six brass 40mm x 38mm venturis — one for each barrel on a pair of three-barrel PMO or Weber carbs on an air-cooled Porsche 911 flat-six.

Features

• Genuine PMO manufacture: Made by Performance Machined Originals for PMO and Weber carbureted 911 induction.
• Six-piece set: One venturi per barrel for a full six-barrel setup.
• Brass construction.
• Tuning part: Changing venturi size shifts where the carbs make their best response and power.

Tuning Notes

Venturi size is one of the primary levers for matching PMO or Weber carburetors to a specific engine's displacement and cam profile — going too large can hurt off-idle response and too small can restrict top-end breathing. If you are not certain which venturi size your current jetting was built around, check your carburetor tag or reach out with your engine specs before ordering, since venturis are a precision fit item and are not typically returnable once installed.

Fitment

CONFIRMED:

• Air-cooled Porsche 911, 1965–1989, running PMO or Weber carburetion

NOT CONFIRMED / does not fit:

• Fuel-injected (MFI or CIS) 911s without a carburetor conversion
• Other carburetor makes — confirm your carb before ordering

Specifications

• Brand: PMO (Performance Machined Originals)
• Part Number: PM-O180-5
• Venturi Size: 40mm x 38mm
• Material: Brass
• Pieces: 6
• Origin: Imported
• Shipping Weight: 0.72 lb
• Boxed Dimensions: 8 x 6 x 2 in

Frequently Asked Questions

• Does this fit my Porsche? It fits air-cooled Porsche 911s (1965–1989) running PMO or Weber carburetors.
• What is the part number? PMO PM-O180-5.
• What size are the venturis? 40mm x 38mm, brass.
• How many come in the set? Six, one per barrel for a pair of three-barrel carburetors.
• How do I know which venturi size I need? Venturi size is matched to displacement and cam profile, and your jetting is built around it. Check your carburetor tag or send us your engine specs before ordering.
• Can I return venturis after installing them? Venturis are a precision fit item and are not typically returnable once installed, so confirm the size before you fit them.

Prop 65 Warning

WARNING: This product can expose you to chemicals including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

The Washburn's Metal Difference

Washburn's Metal is a family-run air-cooled VW & Porsche specialist shop — every part we sell is inspected before it ships, and our team is on hand by phone or email if you have a fitment question before or after you order. We stand behind what we sell: if a part doesn't fit as described, reach out and we'll make it right.