G.E. Five Main Girdle – In-House Installation Only *Customer Block Drop-Off Required*

G.E. Five Main Girdle

NOTE: In-House Installation Only – Customer must deliver block to Golden Eagle Mfg.

📦 Download Block Packing Instructions (PDF)

Strengthen your B-series bottom end with our proven Five Main Girdle. This billet girdle ties all five main caps together, dramatically increasing block rigidity and main cap stability — a trusted choice for high-horsepower B-series builds pushing 1000+ HP.

Available in Two Variants:

• Girdle Only
• Girdle + Acura B18C Windage Tray & Oil Pickup

Key Features & Specifications:

• Precision CNC machined from 6061-T6 billet aluminum
• Includes premium ARP 2000 main stud bolts and washers (~220,000 psi tensile strength)
• Fully installed and line-honed in our facility only for perfect fitment and alignment
• Compatible with Honda/Acura B18C, B18A/B, B20B, and B16A blocks
• Requires a B18C OEM oil pan or aftermarket B-series Moroso oil pan

Lead Time & Shipping:

This girdle ships in approximately 3–6 weeks after your block is delivered to us. Most commonly performed alongside sleeving or full engine builds. Inbound/return shipping is not included.

Part Numbers:

• GM5MAINGIRDLE – Girdle Only
• GM5MAINGIRDLE-KIT – Girdle + B18C Windage Tray & Oil Pickup

Whether you're new to B-series builds or a seasoned racer, this girdle delivers the bottom-end strength needed for extreme boost and RPM. Call or email us to get started.