PMO Carburetors

Please see the PMO vs OE Carb Overview
Kit Includes
Carburettor actuating lever
Throttle rod with ball joints x 3
Ball ends x 5
Actuating lever bracket x 2
Porsche 911
Porsche 964
Porsche 993
Accelerator linkage kit when fitting PMO carburetors.
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97

Please see the PMO vs OE Carb Overview
Kit Includes
Carburettor actuating lever
Throttle rod with ball joints x 3
Ball ends x 5
Actuating lever bracket x 2
Porsche 911
Porsche 964
Porsche 993
Accelerator linkage kit when fitting PMO carburetors.
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97

Sold as a set of 2.
Carbon Fiber Air Cleaner Covers for Porsche Flat-Six motors, inspired by the open mesh air filters of the legendary Porsche 917. These meticulously designed covers are tailored for Porsche Flat-six engines with Weber Carburetors, PMOs, or ITBs that use the standard oval Weber air filter, offering a unique blend of enhanced airflow and unparalleled aesthetic appeal.
Constructed from premium twill carbon fiber and finished with a satin coating, these covers provide not only exceptional durability and light-weight strength but also a distinctive luxurious style. Echoing the iconic design of the Porsche 917's air filters, our covers feature aggressive openings equipped with a multitude of custom mesh option. This design choice pays tribute to Porsche's rich racing heritage and optimizes airflow to the engine.
Designed for a flawless fit over a traditional Weber-style base and oval filter setup (please note, the base and filter are not included), our air cleaner covers promise an effortless installation process without the need for any modifications. This precision fitment ensures that enhancing your Porsche with our covers is a simple yet impactful upgrade.
Whether you aim to capture the essence of the Porsche 917 in your vehicle or simply wish to elevate your Porsche's engine bay aesthetics and airflow efficiency, our Carbon Fiber Air Cleaner Covers are the ideal choice. Embark on an upgrade journey that marries advanced technology, premium materials, and inspired design, taking your Porsche to new heights of distinction and elegance.
Please note: This part is on special order terms. It is not a subject to cancellation or return if not required.
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)

Sold as a set of 2.
Carbon Fiber Air Cleaner Covers for Porsche Flat-Six motors, inspired by the open mesh air filters of the legendary Porsche 917. These meticulously designed covers are tailored for Porsche Flat-six engines with Weber Carburetors, PMOs, or ITBs that use the standard oval Weber air filter, offering a unique blend of enhanced airflow and unparalleled aesthetic appeal.
Constructed from premium twill carbon fiber and finished with a satin coating, these covers provide not only exceptional durability and light-weight strength but also a distinctive luxurious style. Echoing the iconic design of the Porsche 917's air filters, our covers feature aggressive openings equipped with a multitude of custom mesh option. This design choice pays tribute to Porsche's rich racing heritage and optimizes airflow to the engine.
Designed for a flawless fit over a traditional Weber-style base and oval filter setup (please note, the base and filter are not included), our air cleaner covers promise an effortless installation process without the need for any modifications. This precision fitment ensures that enhancing your Porsche with our covers is a simple yet impactful upgrade.
Whether you aim to capture the essence of the Porsche 917 in your vehicle or simply wish to elevate your Porsche's engine bay aesthetics and airflow efficiency, our Carbon Fiber Air Cleaner Covers are the ideal choice. Embark on an upgrade journey that marries advanced technology, premium materials, and inspired design, taking your Porsche to new heights of distinction and elegance.
Please note: This part is on special order terms. It is not a subject to cancellation or return if not required.
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)

The PMO Float Level Gauge measures the float bowl fuel level when using PMO, Weber or Zenith 3 barrel carburetors.
Includes instructions and adjustment washers.
Sold individually and it is suggested to install two gauges, one per bowl.
Porsche 911
Porsche 964
Porsche 993
Please see the PMO vs OE Carb Overview
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97

Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Fuel Pressure Control Unit, AN-6 Hose Fittings
A PMO exclusive, this pressure control unit eliminates the need to change fuel pumps when converting MFI and CIS Injected Systems and indicates the fuel pressure the system is running at. The unit is connected to the feed and return circuits and the fuel pressure is controlled by restricting the flow back to the tank. The flow back to the tank is controlled by the adjustable pressure valve.
This unit is preset with a running pressure of 3.0 to 4.0lbs of fuel pressure
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
- Porsche 993 (911) TURBO 1994-96
- Porsche 993 (911) GT2 1994-97
- Porsche 993 (911) TURBO S 1994-97

Fits:
Porsche 911 - 1965 to 1989
Fuel Pressure Control Unit, Barbed Hose Fittings
A PMO exclusive, this pressure control unit eliminates the need to change fuel pumps when converting MFI and CIS Injected Systems and indicates the fuel pressure the system is running at. The unit is connected to the feed and return circuits and the fuel pressure is controlled by restricting the flow back to the tank. The flow back to the tank is controlled by the adjustable pressure valve.
This unit is preset with a running pressure of 3.0 to 4.0lbs of fuel pressure
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

Fits:
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
When eliminating the heater there is a gap between the fan ring and the engine block.
PMO has created a unique piece that helps cooling while tidying up the engine compartment
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93

Please see the PMO vs OE Carb Overview

Fits
Porsche 911 - Air cooled engine with capacity 2.7ltr through to 3.0ltr
Carburettors, linkage and fuel regulator
PMO Induction utilises aerospace quality castings, machining tolerances, IDF jetting and float technology that is based on Weber's most modern carburettor design.
The original 46mm Weber carburettors simply have the throttle plate enlarged, whereas PMO’s have the
entire throttle body enlarged from the top throat through the plate meaning the air flow capabilities of
PMO Induction’s carburettors are significantly improved over the equivalent size Weber.
PMO Induction use a one-piece, machined stainless steel throttle shaft, supported by large ball
bearings for a lifetime of smooth throttle action negating the Weber carburettors biggest problem as
Weber carbs suffered greatly with throttle shaft wear, air leaks, and binding over the years. Weber throttles also suffer from heat soak
that exacerbate the wear issues but this does not affect PMO Induction carburettors.
The PMO Induction carburettors have a sight glass float bowl to allow for accurate setting of fuel levels,
much more simple and efficient than the Weber IDA method that requires partial a carburettor disassembly.
The fuel inlet system is also greatly improved to provide significantly improved flow capacity and fuel delivery balance against
the banjo set-up on the Weber carbs, which are highly prone to leak and are capacity limited on high flow applications.
Specification:
Carburettor Size - 40mm
Choke - 36
Mains - 145
Air Corrector - 190
Em Tubes - F11t
Idle Jets - 55
Float Check Valve - 0.5
* The engine cc range in the listings is an approximation based on typical displacement requirements utilising standard (stock) ported cylinder heads and factory style cams.
Any carb sets / manifolds should always be matched to the head port size for the standard (stock) engines.
**Engines with enlarged ports, higher compression ratios, race camshafts, will require additional components for tuning beyond the standard kit
specifications
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC

Replacing worn or faulty Weber carburettors or looking for increased performance? Choose PMO Induction carburetors
Weber carburettors are a good product, but they were designed for mass production. PMO Induction carburetors are highly engineered and designed to exacting standards tht are not feasible in typical mass production.
This is why we feel that PMO Induction carburetors are a superior product.
Please see the PMO vs OE Carb Overview

Fits
Carburettors, linkage and fuel regulator
PMO Induction utilises aerospace quality castings, machining tolerances, IDF jetting and float technology that is based on Weber's most modern carburettor design.
The original 46mm Weber carburettors simply have the throttle plate enlarged, whereas PMO’s have the
entire throttle body enlarged from the top throat through the plate meaning the air flow capabilities of
PMO Induction’s carburettors are significantly improved over the equivalent size Weber.
PMO Induction use a one-piece, machined stainless steel throttle shaft, supported by large ball
bearings for a lifetime of smooth throttle action negating the Weber carburettors biggest problem as
Weber carbs suffered greatly with throttle shaft wear, air leaks, and binding over the years. Weber throttles also suffer from heat soak
that exacerbate the wear issues but this does not affect PMO Induction carburettors.
The PMO Induction carburettors have a sight glass float bowl to allow for accurate setting of fuel levels,
much more simple and efficient than the Weber IDA method that requires partial a carburettor disassembly.
The fuel inlet system is also greatly improved to provide significantly improved flow capacity and fuel delivery balance against
the banjo set-up on the Weber carbs, which are highly prone to leak and are capacity limited on high flow applications.
Specification:
Carburettor Size - 46mm
Choke - 36
Mains - 145
Air Corrector - 185
Em Tubes - F11t
Idle Jets - 55
* The engine cc range in the listings is an approximation based on typical displacement requirements utilising standard (stock) ported cylinder heads and factory style cams.
Any carb sets / manifolds should always be matched to the head port size for the standard (stock) engines.
**Engines with enlarged ports, higher compression ratios, race camshafts, will require additional components for tuning beyond the standard kit
specifications
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC

Replacing worn or faulty Weber carburettors or looking for increased performance? Choose PMO Induction carburetors
Weber carburettors are a good product, but they were designed for mass production. PMO Induction carburetors are highly engineered and designed to exacting standards tht are not feasible in typical mass production.
This is why we feel that PMO Induction carburetors are a superior product.
Please see the PMO vs OE Carb Overview

Fits
Carburettor x 2, linkage and fuel regulator.
PMO Induction utilises aerospace quality castings, machining tolerances, IDF jetting and float technology that is based on Weber's most modern carburettor design.
The original 46mm Weber carburettors simply have the throttle plate enlarged, whereas PMO’s have the
entire throttle body enlarged from the top throat through the plate meaning the air flow capabilities of
PMO Induction’s carburettors are significantly improved over the equivalent size Weber.
PMO Induction use a one-piece, machined stainless steel throttle shaft, supported by large ball
bearings for a lifetime of smooth throttle action negating the Weber carburettors biggest problem as
Weber carbs suffered greatly with throttle shaft wear, air leaks, and binding over the years. Weber throttles also suffer from heat soak
that exacerbate the wear issues but this does not affect PMO Induction carburetors.
The PMO Induction carburettors have a sight glass float bowl to allow for accurate setting of fuel levels,
much more simple and efficient than the Weber IDA method that requires partial a carburettor disassembly.
The fuel inlet system is also greatly improved to provide significantly improved flow capacity and fuel delivery balance against
the banjo set-up on the Weber carbs, which are highly prone to leak and are capacity limited on high flow applications.
Specification:
Carburettor Size - 40mm
Choke - 34
Mains - 135
Air Corrector - 185
Em Tubes - F11t
Idle Jets - 55
* The engine cc range in the listings is an approximation based on typical displacement requirements utilising standard (stock) ported cylinder heads and factory style cams.
Any carb sets / manifolds should always be matched to the head port size for the standard (stock) engines.
**Engines with enlarged ports, higher compression ratios, race camshafts, will require additional components for tuning beyond the standard kit
specifications
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PM-O802-0
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC

Set of 6
Sizes available
40x30mm
40x34mm
40x36mm
40x38mm

Fits
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97


Please see the PMO vs OE Carb Overview
port shape and then it is a matter of matching the port size and carb size desired.
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC


Please see the PMO vs OE Carb Overview
port shape and then it is a matter of matching the port size and carb size desired.
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC

Please see the PMO vs OE Carb Overview

Fits
Carburettors, linkage and fuel regulator
PMO Induction utilises aerospace quality castings, machining tolerances, IDF jetting and float technology that is based on Weber's most modern carburettor design.
The original 46mm Weber carburettors simply have the throttle plate enlarged, whereas PMO’s have the
entire throttle body enlarged from the top throat through the plate meaning the air flow capabilities of
PMO Induction’s carburettors are significantly improved over the equivalent size Weber.
PMO Induction use a one-piece, machined stainless steel throttle shaft, supported by large ball
bearings for a lifetime of smooth throttle action negating the Weber carburettors biggest problem as
Weber carbs suffered greatly with throttle shaft wear, air leaks, and binding over the years. Weber throttles also suffer from heat soak
that exacerbate the wear issues but this does not affect PMO Induction carburettors.
The PMO Induction carburettors have a sight glass float bowl to allow for accurate setting of fuel levels,
much more simple and efficient than the Weber IDA method that requires partial a carburettor disassembly.
The fuel inlet system is also greatly improved to provide significantly improved flow capacity and fuel delivery balance against
the banjo set-up on the Weber carbs, which are highly prone to leak and are capacity limited on high flow applications.
Specification:
Carburettor Size - 46mm
Choke - 38
Mains - 155
Air Corrector - 180
Em Tubes - F16t
Idle Jets - 55
* The engine cc range in the listings is an approximation based on typical displacement requirements utilising standard (stock) ported cylinder heads and factory style cams.
Any carb sets / manifolds should always be matched to the head port size for the standard (stock) engines.
**Engines with enlarged ports, higher compression ratios, race camshafts, will require additional components for tuning beyond the standard kit
specifications
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50

Replacing worn or faulty Weber carburettors or looking for increased performance? Choose PMO Induction carburetors
Weber carburettors are a good product, but they were designed for mass production. PMO Induction carburetors are highly engineered and designed to exacting standards tht are not feasible in typical mass production.
This is why we feel that PMO Induction carburetors are a superior product.
Please see the PMO vs OE Carb Overview

Fits
Porsche 911 - Air cooled engine with a capacity of 3.2ltr through to 3.4ltr
Kit Includes
Carburettors, linkage and fuel regulator
PMO Induction utilises aerospace quality castings, machining tolerances, IDF jetting and float technology that is based on Weber's most modern carburettor design.
The original 46mm Weber carburettors simply have the throttle plate enlarged, whereas PMO’s have the
entire throttle body enlarged from the top throat through the plate meaning the air flow capabilities of
PMO Induction’s carburettors are significantly improved over the equivalent size Weber.
PMO Induction use a one-piece, machined stainless steel throttle shaft, supported by large ball
bearings for a lifetime of smooth throttle action negating the Weber carburettors biggest problem as
Weber carbs suffered greatly with throttle shaft wear, air leaks, and binding over the years. Weber throttles also suffer from heat soak
that exacerbate the wear issues but this does not affect PMO Induction carburettors.
The PMO Induction carburettors have a sight glass float bowl to allow for accurate setting of fuel levels,
much more simple and efficient than the Weber IDA method that requires partial a carburettor disassembly.
The fuel inlet system is also greatly improved to provide significantly improved flow capacity and fuel delivery balance against
the banjo set-up on the Weber carbs, which are highly prone to leak and are capacity limited on high flow applications.
Specification:
Carburettor Size - 46mm
Choke - 40
Mains - 165
Air Corrector - 180
Em Tubes - F7t
Idle Jets - 60
* The engine cc range in the listings is an approximation based on typical displacement requirements utilising standard (stock) ported cylinder heads and factory style cams.
Any carb sets / manifolds should always be matched to the head port size for the standard (stock) engines.
**Engines with enlarged ports, higher compression ratios, race camshafts, will require additional components for tuning beyond the standard kit
specifications
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
The PMO carburetor was designed from the beginning to be a state-of-the art carburetor. They start off with a casting designed around a 50mm throttle plate and downsized to 46 and 40mm to achieve three different sizes. They use an excellent material and process: A-356 aircraft aluminum and permanent mold casting. Permanent mold casting is a preferred method in the aerospace industry. This compares favorably with conventional carburetors, including Weber, which are die cast pot metal.
Since they designed a larger carburetor from scratch, the air entry and flow is much greater than the three barrel Weber. This is accomplished by having larger main barrels in the throttle body, tapering the top covers and then installing larger diameter velocity stacks of corresponding taper. This maintains the boost from the velocity stacks down to the exact point where it operates on the auxiliary venturis.
- Ball Bearing Supported Single Throttle Shaft
- Replaceable Idle Air Jets
- Float Bowl Sight Glass
- Full Range of Venturis, Jets, Emulsion Tubes
- Float Bowl & Float Improvements
- Two Sizes of Auxiliary Venturis
- Heat Treated Aluminum Permanent Mold Castings
NOTE:PMO recommends using their Carburetor Insulator Kit, between the head and the manifold when installing these carburetors. Insulators restrict heat transfer from the head to the carburetor float bowl to prevent percolation. The kit includes insulators for two carburetors, gaskets, and longer stainless steel head studs. When purchasing Carburetor Insulator, Manifold to Head, Kit. Include information of carburetor size, year/type of head, and intake port diameter.
Design911 recommends that upon removing manifolds, simply apply liquid wrench to the base of the stud and let stand for a day or two before attempting to remove the head studs.