Atomic - Barra 550 GTA Rebuild Kits

The Atomic 550 Rebuild Kit is engineered for the serious enthusiast looking to push well beyond standard performance. Taking the guesswork out of parts matching, this comprehensive package bundles everything you need to build a rock-solid bottom end and valvetrain capable of reliably handling up to 1000hp.

We don't just supply rods and pistons. The 550 Kit secures your rotating assembly with a 10mm Billet Main Girdle, guarantees oil pressure with a Full Steel Oil Pump, and locks down the cylinder head with 12mm Tool Steel studs and an MLS-D head gasket. It's the ultimate street/strip package.

Phase 1

The core components required to forge your bottom end.

6x ICON Forged Pistons (Dish Top)
Hastings Piston Rings
Heavy Duty Wrist Pins
6x Superleggera Billet Steel Rods
CA625 Conrod Bolts
ACL Race Main Bearings (STD)
ACL Race Big End Bearings (STD)

Phase 2

Adds essential support, oiling, timing, and head sealing.

Includes all Phase 1 items
10mm High-Tensile Billet Main Girdle
Race Spec Full Steel Oil Pump
Powerbond Harmonic Balancer
12mm H13 Tool Steel Head Studs
MLS-D Extreme Duty Head Gasket
HD Timing Chain Kit
Billet Crank Sprocket & HD Guides

Phase 3

The complete package, adding a full valvetrain overhaul.

Includes all Phase 1 & Phase 2 items
Atomic Stage 3 Valve Springs
Anti-Pump Up High-Rev Lifters
+0.5mm Oversize Stainless Valves

Bottom End Gaskets | Seals

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Atomic - Barra 550 GTA Rebuild Kits