Chevrolet Performance LSX Bowtie Engine Block

Chevrolet Performance LSX Bowtie Engine Block

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Chevrolet Performance LSX Bowtie engine blocks are designed for the advanced competition engine builder. They feature Siamese cylinder bores and a semi-finished deck height. The blocks can accept a maximum stroke of 4.250 in., a maximum bore of 4.250 in., and can support displacements of 454 cu. in. or more. LSX Bowties feature cast iron construction with an orange powdercoat finish. They accept all Gen III and IV LS-style cylinder heads, crankshafts, camshafts, and other components. Order the model with deck height and other options needed for your application.

Additional features and specs include:

* Front oil feed lines that can be plugged or restricted for mechanical flat tappet or mechanical lifter applications
* Can be safely machined to 9.200 in. deck height
* 1054 billet steel 6-bolt main bearing caps
* 6-bolt cylinder head bolt pattern
* Cam bores that can be machined to accept 60mm roller bearings
* Can be machined for larger diameter lifters
* External oil pump feed at the rear
* Added 7th transmission bolt hole to work with early-style GM transmissions
* Can accept a front motor plate for racing use
* Threaded freeze plugs that can be used for external heaters or coolers
* Windowed main bulkhead


Manufacturer's Part Number:
Part Type:
Product Line:
Part Number:
Main Journal Type:
LS mains
Engine Block Style:
Stock/OEM standard deck
Deck Height (in.):
9.260 in.
Cylinder Bore as Shipped:
4.065 in.
Engine Block Material:
Cast iron
Engine Block Weight (lbs):
225 lbs.
Main Bolt Style:
Main Caps Included:
Main Cap Material:
Billet steel
Main Cap Fasteners Included:
Main Bearings Included:
Rear Main Seal Style:
Finished Cylinder Bores:
Raised Cam Location:
Cam Bearings Included:
Freeze Plugs Included: