Ringbrothers Build 650-HP Pontiac GTO

Ringbrothers spent 5,500 hours transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO with carbon fiber and custom parts.

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Nov 2, 2026

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Ringbrothers Build 650-HP Pontiac GTO

Ringbrothers spent 5,500 hours transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO with carbon fiber and custom parts.

In brief

Ringbrothers spent 5,500 hours transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO with carbon fiber and custom parts. Ringbrothers completed a 650-hp 1965 Pontiac GTO Convertible after 5,500 hours of work at SEMA. Originally reported by Motor1.

Project Start

Ringbrothers began transforming a 1965 Pontiac Tempest Convertible into a 650-hp GTO.

Body Modifications

The car received a five-inch wider body and reshaped front fenders, rocker panels, and rear quarters.

Carbon Fiber Use

Carbon Fiber Use

The hood, front wheel tubs, lower front valance, and rear diffuser are made from carbon fiber.

Custom Exterior

The car features a custom Billie Goat Blue finish with polished chrome accents and black detailing.

Engine Details

Under the hood is a supercharged 6.2-liter LT4 V8 from Wegner Motorsports producing 650 horsepower.

Interior Upgrades

Interior Upgrades

The interior includes custom aluminum trim, Dakota Digital instruments, and a restored factory radio with bluetooth.

What it means

Ringbrothers completed a 650-hp 1965 Pontiac GTO Convertible after 5,500 hours of work at SEMA.

Read the original on Motor1

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