ATK #13ZB 350CI Bare Block Machined & Ready to Assemble



Lead Time: In stock ready to ship



ATK is now offering a 100% New Bare Block. We introduced this block to the market a few years back and have thousands in the field. From stock replacements, high performance, marine and industrial use on CNG/LPG, these blocks have been proven. In the past ATK had offered something similar to this off a core block, it was extremely successful selling over 5000 machined blocks. Unfortunately, within the last 5 years the 350 core has become harder to find resulting in shutting down that program. To fill the void and keep up with the demand of the ever so popular 350 engine, we set out to cast our own block and once again offer it has a Machined Block ready to build off.


ATK blocks are stroker clearanced and will come with the cam bearings and brass freeze plugs installed. 


Engine Specifications:

• Block: 100% New Bare Block with 1pc Rear Main Seal
• Bore: 4.000” (4.0003-4.0008”- Pistons size vary, final honing may be required)
• Maximum Bore: 4.060” recommended
• Displacement: 350CI
• Main Journal Type: Chevy 350
• Engine Block Material: Premium Iron Alloy
• Engine Block Style: Aftermarket, based off the Vortec 350 Roller Block
• Engine Block deck Height: Standard Deck
• Engine Oiling System: Priority Main
• Fuel Pump Boss: Yes
• Main Bolt Style: 4 Bolt
• Main Caps Included: Yes
• Main Cap Material: Cast Iron
• Main Cap Fasteners Included: Yes
• Main Bearings Included: No
• Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
• Freeze Plugs: Brass, installed and sealed
• Oil Galley Plugs: Installed and sealed
• Roller Camshaft Compatible: Yes
• Stroker Clearanced: Yes, but the assembler must always check as components differ.


Block Specs:
Camshaft bearing line boring in STD. (1.8705” – 1.8710”)
Main, line honed (2.6408” – 2.6415”)
Cylinder honing ID: (4.0003-4.0008”)
Minimum deck height (9.014”)


Disclaimer: The recommended components listed are ATK’s recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you are not certain about a component to use. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.  ATK reserves the right to substitute parts used in engines if necessary.





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