Pacemaker | 1 3/4" 4-into-1 Competition Headers | Holden HQ–WB Small Block Chev 283–400 V8 | PH5325 L/R

Pacemaker 1 3/4" 4-into-1 Competition Headers - Holden HQ-WB Small Block Chevrolet V8 - PH5325 L/R

Unleash true competition-grade performance from your small block chevrolet engine swap with these premium Pacemaker Tuned 4-into-1 headers. Specifically engineered for Holden HQ through WB models converting to Small Block Chevrolet V8 power (283, 302, 305, 307, 327, 350, 400), these headers offer maximized exhaust scavenging and high-RPM power transmission. Note: Designed specifically for standard deck blocks; will not clear column automatic or Powerglide automatic transmissions.

Features:

This product offers the following high-performance features:

• Tuned 4-into-1 Design: Engineered with mathematically matched 1¾" (44mm) primary pipes leading to a high-flowing 3" (76mm) collector path to deliver maximum top-end horsepower and throttle response.
• Slant Plug Compatibility: Cleverly routed architecture ensures complete clearance with both standard straight and performance slant-plug cylinder heads.
• Mandrel-Bent Tubing: Formed using precise CNC mandrel bending techniques to ensure uniform pipe diameter lines and completely eradicate restrictive exhaust choke points.
• Heavy-Duty Structural Flanges: Precision laser-cut mounting plates provide an absolute flush sealing face to eliminate standard warpage risks under extreme heat configurations.
• Power Steering Clearance: Engineered layout preserves absolute clearance and operating safety with original factory power steering boxes.

Important Notes:

• Will clear aftermarket slant-plug cylinder heads.
• Will NOT fit models running a column automatic setup or Powerglide automatic transmissions. Fits Turbo 400 automatic transmissions smoothly.
• Will NOT clear premium performance raised port aftermarket cylinder heads.
• Will only mount properly with standard factory original engine mounting spacers or specialized PACEMAKER spacers (Part Number: Pemp 350). Note: Spacers must be located on the correct sides of the engine bay configuration (Right Hand spacer stands 1¾” high, Left Hand spacer stands 1¼” high).

Important Information

• The image shown may not reflect the actual product
• Shipping times may vary depending on destination and stock availability

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