OEM Turbo Buick 109 Main Caps (Set of 2)

Authentic GM main caps for the Turbo Buick 109 block. These caps are new old stock (NOS) and have never been installed, but they do show light cosmetic oxidation and marks from long-term storage. Structurally perfect and ready for machine work, they’re ideal for anyone restoring or blueprinting a factory 109 engine.

🔵 Blue Dot – Verified New / Excellent Stored Condition

Specifications:
• Application: 1986–1987 Buick Turbo V6 (109 block)
• Material: Cast iron (OEM)
• Includes: Two main caps (as pictured)
• Condition: New old stock — never installed
• Notes: Must be line-honed to your block during installation

Condition Notes:
• Light surface oxidation from storage
• No cracks, no thread damage, no stress marks
• Mounting surfaces clean and unmodified
• Perfect candidates for precision machining and engine rebuilding

Why You Want It:
OEM GM main caps in new condition are extremely rare. If you’re building a correct 109 engine or replacing damaged caps, this set gives you original GM geometry with zero prior wear. Machine shops prefer OEM hardware for accurate align-honing and long-term reliability.

⚠️ All Turbo 6 Parts are sold as-is with no returns, refunds, or exchanges. Buyer is responsible for verifying fitment and compatibility before purchase.