Billet Center Main Caps (Pair)

This is a billet center main cap set for 1986–1987 Buick Grand National and Turbo Buick applications, designed to reinforce the factory block by strengthening the center mains where crankshaft load is highest.

Included with the Kit:
Billet center main caps (pair)

Here’s what’s not included with the kit (at this exact moment):
Main studs or bolts
Main bearings
Machine work

These caps provide a solid foundation upgrade for builders looking to improve bottom-end strength and crankshaft stability on performance Turbo Buick engines.

🟦 New Part – Engine Bottom End Reinforcement (86–87 Turbo Buick)

Why You Want It
Because center mains take the biggest beating. Under boost, the factory caps can flex, leading to bearing wear and crankshaft instability. These billet center caps dramatically increase rigidity in the most critical area of the block, helping keep the crankshaft aligned and bearings happy when power levels climb. If you’re pushing horsepower or building for durability, upgrading the center caps is smart insurance that protects your short block from flex-related failures.

All parts are sold as-is with no returns, refunds, or exchanges. Buyer is responsible for verifying fitment for their specific application prior to purchase. Turbo 6 Parts makes no performance guarantees. All sales are final.