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Moroso 63423 - Filler Neck Kit

Since 1968, Moroso Performance Products is one of the worlds most respected suppliers of automotive equipment for racing and street performance applications!

Filler Neck Housing
Manif. Mounted
H-2 5/16 in.
R/L Water Hose Oulet Location
Incl. 0.5 NPT And 2 0.25 in. NPT Machined Ports
V8/90 Deg V6 Chevy
Cast Aluminum
Availability: Will be special ordered for you.
Pricing: $55.99


• Manifold-mounted filler neck base is identical to the one included in Moroso Kit No. 63420 without the filler neck or mounting hardware
• Allows you to install a variety of bolt-on style filler necks (radiator cap or -AN style) or block-off plates, offering cooling system flexibility, for both race and street applications
• 356-T6 cast-aluminum base stands 2-5/16" tall, which locates filler neck at highest point to bleed off air on cars with low-mount radiators
• Includes a 1/2" NPT machined port for installing a water temperature sending unit, and two 1/4" NPT machined ports to plumb return lines on popular aftermarket cylinder heads
• The unit can be flipped 180° for either right or left water hose outlet location
• Use with one of Moroso's Bolt-On Filler Necks Nos. 63460, 63461, 63465, 63466, or Block-Off Plate No. 63471

California Proposition 65

California Prop 65WARNING: Cancer & Reproductive Harm -


  • 63423
  • 63423
  • 084663634239
  • Moroso
  • Will be special ordered for you.
  • New

Shipping Information

  • Item Requires Shipping
  • 1.2 lbs.
  • W4.0000” x H5.0000” x L4.0000”

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California Residents: Prop 65

WARNING: Cancer and Reproductive Harm -