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4 BOLT Main Conversion Pkg. Back by Popular Demand

New Items
Cool Tools
Hemi Rocker Stands
Rocker Arm Bushing Kits
Rocker Shafts / Holddowns
Rocker Spacers / Shims
RB 4-Bolt Conversion
Rear Main Seal Kit
Windage Tray / Scrapers
Carb Synchronizer
Head Gaskets
Intake Gaskets
Stainless Valves
Timing Stabilizer
1/4 Scale Hemi
Dynamic Converters
Hemi Sparkplug O-Rings
Max Wedge Throttle Arms


Have an awesome block that makes good power and you don't want to buy a new-unseasoned green block?

Sturdy up the bottom end with our 4 bolt-main conversion package. Will withstand 1500 plus horsepower. Reuse main bearings between buildups. Machining required, complete instructions and all hardware. Features 1/2" cross bolts and reinforced block sides. Makes a girdle out of the entire block. There is no stronger system, anywhere. Installation available.

Now available with NEW Dvorak Machine Billet Caps and hardware.

4 Bolt Conversion Kit

Dvorak Billet 4-Bolt Conversion Kit

Four Bolt Conversion Installed

Dvorak Billet 4-Bolt Conversion Kit Installed

Dvorak Billet Main Caps

Dvorak Main Caps

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