• Top Street Performance Chevy V8 Aluminum 15 Degree Water Neck - Black - for street and performance builds
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Top Street Performance

Chevy V8 Aluminum 15 Degree Water Neck - Black

Chevy V8 Aluminum 15 Degree Water Neck - Black

SKU: SP8459BK

$31.95
$31.95 $35.15
Shipping calculated at checkout.

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Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.

Product Details

Features

  • 5° aluminum outlet routes the upper radiator hose cleanly in tight bays
  • Swivel design and included O-ring simplify hose alignment and leak-free sealing
  • Fits Chevy Gen I small block (262-400 CID) and big block (396-454 CID) engines
  • Black finish; also offered in black and straight/45°/90° angles

Description

This 15° aluminum water neck creates the coolant outlet connection between the thermostat housing and upper radiator hose, with a black finish that gives the engine bay a clean, finished look. The 15° outlet angle helps route the upper radiator hose cleanly where a straight neck wouldn't clear engine bay components, and an included O-ring seal helps reduce leak points at the housing connection.

This water neck is built for Chevy Gen I small block (262-400 CID) and Gen II/V/VI big block (396-454 CID) engines only — it is not designed for LS-based (Gen III/IV) small block engines, which use a different thermostat housing design. The swivel design allows the outlet to rotate for hose routing flexibility after installation, and mounting hardware is included.

Not all Chevy small block or big block engines share identical thermostat housing bolt patterns across every model year — confirm your engine's housing bolt pattern matches before ordering.


Engine Applications
Fits Chevrolet Gen I small block V8s from 262 through 400 CID and Gen II (Mark IV), Gen V, and Gen VI big block V8s from 396 through 454 CID. Suited to classic and performance builds, street rods, and restorations using a matching thermostat housing bolt pattern — LS-generation (Gen III/IV) small blocks use a different housing design and aren't covered by this fitment.

Installation
Confirm your thermostat housing bolt pattern and outlet angle before installing, since housing dimensions vary by engine year even within the same family. The included O-ring seals against the housing face, and the swivel outlet can be rotated after mounting to fine-tune upper radiator hose alignment without disturbing the seal.

Specs

Water Neck Material Aluminum
Water Neck Finish Black
Water Neck Style 15°
Sealing Style O-Ring (Included)
Swivel Yes
Heater Bypass Provision No
Mounting Hardware Included

Engine Fitment

COMPATIBLE WITH
CHEVROLET BIG BLOCK V8 GEN. II (MARK IV)
• 6.5 L / 396 in3
• 6.6 L / 402 in3
• 7.0 L / 427 in3
• 7.4 L / 454 in3

CHEVROLET BIG BLOCK V8 GEN. V
• 7.4 L / 454 in3

CHEVROLET BIG BLOCK V8 GEN. VI
• 7.4 L / 454 in3

CHEVROLET SMALL BLOCK V8 GEN. I
• 4.3 L / 262 in3
• 4.3 L / 265 in3
• 4.4 L / 267 in3
• 4.6 L / 283 in3
• 4.9 L / 302 in3
• 5.0 L / 305 in3
• 5.0 L / 307 in3
• 5.4 L / 327 in3
• 5.7 L / 350 in3
• 6.6 L / 400 in3

NOTES
• Designed to seal at the thermostat housing area — confirm bolt pattern, O-ring sealing style, and outlet angle match your application before installation.
• Not all Chevy small block or big block engines use identical thermostat housing bolt patterns across every year — verify fitment against your specific engine's housing before ordering.

COMMON VEHICLE APPLICATIONS
Classic and performance vehicles using matching thermostat housing dimensions
Street rods and custom cooling system applications
Engine builds requiring the listed water neck angle and sealing style

Q&A

What does this water neck do?
This water neck provides the coolant outlet connection between the engine's thermostat housing and the upper radiator hose, directing coolant from the engine to the radiator.

What engines is this compatible with?
This water neck is designed for Chevrolet Gen I Small Block V8 (262–400 CID), Gen II Big Block (Mark IV) V8 (396–454 CID), Gen V Big Block V8, and Gen VI Big Block V8 engines.

What angle is this water neck?
This is a 15-degree water neck. TSP also offers straight, 45-degree, and 90-degree versions for applications requiring different upper radiator hose routing.

What finish does this water neck have?
This water neck features a black finish. A polished finish is also available.

Does this include a gasket or seal?
Yes. An O-ring seal is included for installation.

Does this include mounting hardware?
Yes. Mounting hardware is included for installation.

Does this water neck swivel?
Yes. The swivel design allows the outlet to be rotated, making it easier to align the upper radiator hose for a cleaner installation and improved routing flexibility.

Does this include a heater bypass provision?
No. This water neck does not include a heater bypass provision.

Emissions Notice

This product does not affect vehicle emissions and is not subject to emissions compliance regulations.