[{"id":284382593137,"handle":"all-parts-and-engines","title":"All Products","updated_at":"2026-03-19T15:20:08+11:00","body_html":"\u003cp\u003eAll Atomic Performance Products\u003c\/p\u003e","published_at":"2024-12-30T19:16:03+11:00","sort_order":"best-selling","template_suffix":"","disjunctive":true,"rules":[{"column":"variant_title","relation":"not_equals","condition":"0"}],"published_scope":"global","image":{"created_at":"2025-01-16T20:22:01+11:00","alt":null,"width":3000,"height":4000,"src":"\/\/atomicperformanceproducts.com\/cdn\/shop\/collections\/20241008_155351.jpg?v=1737019322"}},{"id":280910168177,"handle":"block","title":"Block","updated_at":"2026-03-18T22:14:49+11:00","body_html":"\u003cp\u003eAtomic engine block parts including standard and destroke cranks, billet conrods, pistons, main caps, girdle, main studs, oil system componens, sump\u003c\/p\u003e\n\u003c!----\u003e","published_at":"2024-08-05T23:32:10+10:00","sort_order":"best-selling","template_suffix":"","disjunctive":true,"rules":[{"column":"type","relation":"equals","condition":"Conrods"},{"column":"type","relation":"equals","condition":"Crank"},{"column":"type","relation":"equals","condition":"Girdle"},{"column":"type","relation":"equals","condition":"Pistons"},{"column":"type","relation":"equals","condition":"Sump"},{"column":"type","relation":"equals","condition":"Oil System"},{"column":"type","relation":"equals","condition":"Main Caps"},{"column":"type","relation":"equals","condition":"Engine Block"}],"published_scope":"global","image":{"created_at":"2024-08-06T00:00:07+10:00","alt":null,"width":1305,"height":813,"src":"\/\/atomicperformanceproducts.com\/cdn\/shop\/collections\/550_gta_short.png?v=1723016162"}},{"id":280910430321,"handle":"rods","title":"Rods","updated_at":"2026-03-12T22:16:22+11:00","body_html":"\u003cp\u003eAtomic Billet Conrods\u003c\/p\u003e\n\u003c!----\u003e","published_at":"2024-08-05T23:38:59+10:00","sort_order":"best-selling","template_suffix":"","disjunctive":false,"rules":[{"column":"type","relation":"equals","condition":"Conrods"}],"published_scope":"global","image":{"created_at":"2024-08-05T23:38:58+10:00","alt":null,"width":2867,"height":2151,"src":"\/\/atomicperformanceproducts.com\/cdn\/shop\/collections\/rods_and_pistons_550.jpg?v=1722865138"}},{"id":285811867761,"handle":"rotating-assembly","updated_at":"2026-03-17T22:16:38+11:00","published_at":"2025-02-16T23:51:43+11:00","sort_order":"best-selling","template_suffix":"","published_scope":"global","title":"Rotating Assembly","body_html":"\u003cp\u003eRods, Pistons, Crank\u003c\/p\u003e","image":{"created_at":"2026-01-29T02:17:34+11:00","alt":null,"width":2048,"height":1365,"src":"\/\/atomicperformanceproducts.com\/cdn\/shop\/collections\/IMG_7119_c5d585c7-c81e-4f8c-87f7-f72ddfd61ac4.jpg?v=1769613454"}}]
When you are building a dedicated high-RPM race engine, the standard Barra geometry becomes a limitation. The Atomic "Destroker" FatRod is designed specifically for our 86mm Stroke (3.5L) Crankshaft. At 161.29mm (6.350") long, this rod significantly improves the rod-to-stroke ratio compared to the factory setup.
💡 DID YOU KNOW?
Rod Ratio determines piston speed. The factory Barra has a relatively low rod ratio of 1.54 (153mm rod / 99.3mm stroke), which limits safe RPM. This Destroker kit increases the rod length to 161.29mm and reduces stroke to 86mm, yielding a near-perfect race ratio of 1.87. This geometry drastically reduces side loading and peak piston acceleration, allowing the engine to rev higher safely with only a minor ~500rpm shift in the torque curve.
The Atomic Solution
Built on our legendary "FatRod" architecture, these rods feature the same 13% wider H-beam profile and aerospace billet steel construction that has resulted in zero failures since 2004. They come standard with CA625 High-Tensile Bolts for ultimate clamping force and feature our signature pressure-fed pin oiling to keep wrist pins alive at 9000+ RPM.
High RPM kills wrist pins. We engineered specific oil pathways to keep your rotating assembly alive where others fail.
Pressure-Fed Pin Oiling: A dedicated channel forces pressurized oil directly into the wrist pin bushing, critical for the high inertial loads of a de-stroked engine.
Piston Crown Cooling: Built-in oil squirters spray the underside of the piston crown, pulling heat out of the combustion chamber to resist detonation.
CA625 Fasteners: Every set comes pre-fitted with CA625 bolts, offering superior clamping force for extreme RPM stability.
Set of 6x Atomic "Destroker" Billet FatRod Conrods
Pre-fitted CA625 Conrod Bolts
Specification Sheet & Torque Guidelines
Small End Bushes (Unfinished for custom sizing)
⚠️ Engineering Note
Not for Standard Cranks: These rods are too long for a standard 99.3mm stroke crank. They MUST be used with an 86mm stroke crank and custom pistons with appropriate compression height.
Custom Pistons Required: Due to the changed rod length and stroke, you will require custom pistons to achieve the correct deck height and compression ratio.
Final Sizing: Small end bushings are supplied unfinished to allow honing for perfect pin clearance.
