1963 Dual-Ghia L6.4 Camshafts

Keep Your 1963 Dual-Ghia L6.4 in Top Shape with Quality Camshafts

Whether you’re repairing or upgrading your Camshaft, using high-quality parts is key to keeping your 1963 Dual-Ghia L6.4 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Camshafts, Camshaft and Lifter Kits, and Camshaft Bearings. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Competitive Prices and Extensive Inventory

The average price for a 1963 Dual-Ghia L6.4 Camshaft at Advance Auto Parts is around $413.12, with a range that starts at $40.99 and goes up to $1,055.99. With 16 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like Engine Camshaft Bearing Set, Xtreme Energy 240/246 Hydraulic Flat Cam and Lifter Kit, and Magnum 224/224 Hydraulic Flat Cam and Lifter Kit start at just $40.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Camshaft, don’t forget to check out other key components like Engine Gaskets and Seals and Valve Cover and Cylinder Heads. At Advance Auto Parts, we’re here to help you keep your 1963 Dual-Ghia L6.4 in peak condition, inside and out.

Essential 1963 Dual-Ghia L6.4 Camshafts

Competition Cams – Mutha’ Thumpr 235/249 Hydraulic Flat Cam (Part No.21-601-5)

Mutha' Thumpr 235/249 Hydraulic Flat Cam

from

$384.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Magnum 231/231 Hydraulic Flat Cam (Part No.21-237-4)

Magnum 231/231 Hydraulic Flat Cam

from

$297.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Xtreme Energy 240/246 Hydraulic Flat Cam (Part No.21-225-4)

Xtreme Energy 240/246 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Xtreme Energy 224/230 Hydraulic Flat Cam (Part No.21-223-4)

Xtreme Energy 224/230 Hydraulic Flat Cam

from

$297.99
HYDRAULIC – Xtreme Energy: Great for street machines, slightly rough idle, works with stock converter but best with 1800+ stall.

Product Features:
  • HYDRAULIC – Xtreme Energy: Great for street machines, slightly rough idle, works with stock converter but best with 1800+ stall.
  • 268/280 Advertised Duration, 224/230 Duration @ .050″, .477″/.480″ Lift, 110 Lobe Separation
  • Single Bolt Camshaft
  • Valve spring upgrade required
See More

Competition Cams – Xtreme Energy 250/256 Hydraulic Flat Cam (Part No.21-226-4)

Xtreme Energy 250/256 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Xtreme Energy 206/212 Hydraulic Flat Cam (Part No.21-220-4)

Xtreme Energy 206/212 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Xtreme Energy 218/224 Hydraulic Flat Cam (Part No.21-222-4)

Xtreme Energy 218/224 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Magnum 224/224 Hydraulic Flat Cam (Part No.21-306-4)

Magnum 224/224 Hydraulic Flat Cam

from

$297.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Magnum 224/224 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-306-4)

Magnum 224/224 Hydraulic Flat Cam and Lifter Kit

from

$449.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Thumpr 227/241 Hydraulic Flat Cam K-Kit (Part No.K21-600-5)

Thumpr 227/241 Hydraulic Flat Cam K-Kit

from

$837.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Big Mutha’ Thumpr 243/257 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-602-5)

Big Mutha' Thumpr 243/257 Hydraulic Flat Cam and Lifter Kit

from

$442.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Xtreme Energy 240/246 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-225-4)

Xtreme Energy 240/246 Hydraulic Flat Cam and Lifter Kit

from

$416.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – High Energy 218/218 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-215-4)

High Energy 218/218 Hydraulic Flat Cam and Lifter Kit

from

$1055.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-600-5)

Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit

from

$476.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-223-4)

Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit

from

$416.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Sealed Power – Engine Camshaft Bearing Set (Part No.1453M)

Engine Camshaft Bearing Set

from

$40.99
Sealed Power® Vintage components provide coverage for applications over 35 years old, restoring classics with like new performance. Leading edge materials, ISO & QS certified manufacturing ensures performance and longevity for treasured engine rebuilds.

Product Features:
  • Steel-backed Babbitt lining material
  • Used in automotive and high-performance
  • Babbitt is designed to perform under extreme loads w/o damaging other engine parts
  • Babbitt is more environmentally friendly than other material
  • ISO & QS certified manufacturing
See More

Most Popular Camshafts for 1963 Dual-Ghia L6.4s

Enhance your 1963 Dual-Ghia L6.4 with one of the 8 Camshafts we have in stock, starting at just $297.99.

Competition Cams – Mutha’ Thumpr 235/249 Hydraulic Flat Cam (Part No.21-601-5)

Mutha' Thumpr 235/249 Hydraulic Flat Cam

from

$384.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Xtreme Energy 240/246 Hydraulic Flat Cam (Part No.21-225-4)

Xtreme Energy 240/246 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Magnum 224/224 Hydraulic Flat Cam (Part No.21-306-4)

Magnum 224/224 Hydraulic Flat Cam

from

$297.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Xtreme Energy 218/224 Hydraulic Flat Cam (Part No.21-222-4)

Xtreme Energy 218/224 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Xtreme Energy 206/212 Hydraulic Flat Cam (Part No.21-220-4)

Xtreme Energy 206/212 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – Magnum 231/231 Hydraulic Flat Cam (Part No.21-237-4)

Magnum 231/231 Hydraulic Flat Cam

from

$297.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Xtreme Energy 224/230 Hydraulic Flat Cam (Part No.21-223-4)

Xtreme Energy 224/230 Hydraulic Flat Cam

from

$297.99
HYDRAULIC – Xtreme Energy: Great for street machines, slightly rough idle, works with stock converter but best with 1800+ stall.

Product Features:
  • HYDRAULIC – Xtreme Energy: Great for street machines, slightly rough idle, works with stock converter but best with 1800+ stall.
  • 268/280 Advertised Duration, 224/230 Duration @ .050″, .477″/.480″ Lift, 110 Lobe Separation
  • Single Bolt Camshaft
  • Valve spring upgrade required
See More

Competition Cams – Xtreme Energy 250/256 Hydraulic Flat Cam (Part No.21-226-4)

Xtreme Energy 250/256 Hydraulic Flat Cam

from

$297.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts,

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Best-Selling 1963 Dual-Ghia L6.4 Camshaft and Lifter Kits

Upgrade your L6.4 with one of our 7 best-selling Camshaft and Lifter Kits.

Competition Cams – Xtreme Energy 240/246 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-225-4)

Xtreme Energy 240/246 Hydraulic Flat Cam and Lifter Kit

from

$416.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Competition Cams – High Energy 218/218 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-215-4)

High Energy 218/218 Hydraulic Flat Cam and Lifter Kit

from

$1055.99
Ideal for use with mainly stock components like rocker arms, intake manifolds, cylinder heads, compression ratio, torque converters and rear gear ratios, the High Energy camshaft grind family is a great choice for street performance applications.

Product Features:
  • Good blend of efficiency and performance.
  • Perfect choice for performance street rebuilds.
  • Work well with mainly stock components such as rockers, manifolds, heads, compression, torque converters and gears.
See More

Competition Cams – Thumpr 227/241 Hydraulic Flat Cam K-Kit (Part No.K21-600-5)

Thumpr 227/241 Hydraulic Flat Cam K-Kit

from

$837.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-600-5)

Thumpr 227/241 Hydraulic Flat Cam and Lifter Kit

from

$476.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Magnum 224/224 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-306-4)

Magnum 224/224 Hydraulic Flat Cam and Lifter Kit

from

$449.99
An older member of the COMP Cams grind family, the Magnum series of camshafts offers excellent performance gains over stock without the added wear and tear associated with more aggressive camshafts.

Product Features:
  • Best with aftermarket torque converters and 9.5:1 compression.
  • Great high RPM power.
  • Easy on valve train parts.
  • Can be used with mild ratio rocker arms and traditional performance valve springs.
See More

Competition Cams – Big Mutha’ Thumpr 243/257 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-602-5)

Big Mutha' Thumpr 243/257 Hydraulic Flat Cam and Lifter Kit

from

$442.99
Designed to deliver an aggressive, hard-hitting exhaust note at idle, the Thumpr camshaft series from COMP Cams also delivers excellent horsepower gains and a broad torque curve. A perfect choice for muscle cars and street rods.

Product Features:
  • Early intake valve opening and long exhaust duration create optimum overlap for powerful, hard-hitting exhaust note.
  • Best with aftermarket converters and more rear gear.
  • Three unique cam designs for each application that deliver excellent horsepower gains and broad torque curve; perfect choice for muscle cars and street rods.
See More

Competition Cams – Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit (Part No.CL21-223-4)

Xtreme Energy 224/230 Hydraulic Flat Cam and Lifter Kit

from

$416.99
Featuring a quicker valve opening, the Xtreme Energy camshaft profile provides increased responsiveness and more area under the lift curve than older, slower grinds. Designed to increase performance without sacrificing driveability and creature comforts.

Product Features:
  • Excellent performance in street carbureted applications.
  • More vacuum allows an increase in duration for improved performance and assists power brakes.
  • Quicker opening lobe profiles deliver increased responsiveness and more area under the lift curve.
  • Best performance with aftermarket intake manifolds, headers, lower gear ratios etc.
See More

Top-Quality Camshaft Bearings for 1963 Dual-Ghia L6.4s

Choose a high-quality OEM or aftermarket Camshaft Bearing for Dual-Ghia L6.4s and enjoy top-notch performance from $40.99.

Sealed Power – Engine Camshaft Bearing Set (Part No.1453M)

Engine Camshaft Bearing Set

from

$40.99
Sealed Power® Vintage components provide coverage for applications over 35 years old, restoring classics with like new performance. Leading edge materials, ISO & QS certified manufacturing ensures performance and longevity for treasured engine rebuilds.

Product Features:
  • Steel-backed Babbitt lining material
  • Used in automotive and high-performance
  • Babbitt is designed to perform under extreme loads w/o damaging other engine parts
  • Babbitt is more environmentally friendly than other material
  • ISO & QS certified manufacturing
See More

FAQs for 1963 Dual-Ghia L6.4 Camshafts

What are the best-selling Camshafts for 1963 Dual-Ghia L6.4s?

Out of 16 Camshafts that fit 1963 Dual-Ghia L6.4s, the following parts are the top sellers:

What’s the price range for 1963 Dual-Ghia L6.4 Camshafts?

The prices of Camshafts for the 1963 Dual-Ghia L6.4 range from $40.99 up to $1,055.99 for the most premium parts.

What is the average price of a Camshaft for a 1963 Dual-Ghia L6.4?

The average price for Camshafts for the 1963 Dual-Ghia L6.4 is $413.12. Keep in mind the variety of part types within our Camshaft category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Camshafts for other Dual-Ghia L6.4 model years?

Yes, we carry Camshafts for 2 model years of Dual-Ghia L6.4s between 1960 and 1962. The following model years are the most popular for Camshaft purchases: 1962, 1961, and 1960.

What are the cheapest Camshafts for my 1963 Dual-Ghia L6.4?

The cheapest 1963 Dual-Ghia L6.4 Camshafts we carry are:

What types of Camshafts do you sell for my 1963 Dual-Ghia L6.4?

As of 11/2/25, these are some of the most in-demand types of Camshafts for a 1963 Dual-Ghia L6.4:

Can I get help with 1963 Dual-Ghia L6.4 Camshaft orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Dual-Ghia Camshafts and more.

What is your return policy for Dual-Ghia L6.4 Camshafts?

Advance Auto Parts keeps returns simple. For new Dual-Ghia L6.4 Camshafts and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.