MTM1XX-105 Mast Motorsports LS7 427 Aluminum Short Block, 11.4:1 Compression Ratio
This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.
Availability: Special Order Item
Shipping: FREE 48 State Shipping
LS7 427CID Short Block, 11.4:1 Compression Ratio (based on 70cc Heads), 4.125" Bore x 4.000" Stroke Mast Motorsports is now proud to offer expertly hand assembled LS short blocks for customers wanting a premium foundation for their engine projects. Each short block is align honed with torqued ARP main studs then decked on their CNC machine with their precision fixturing. The block is then plateau honed, deburred, and washed. Dura Bond cam bearings, ACL main bearings, and ACL rod bearings are utilized for each Mast Motorsports assembly. Using only the highest quality forged rotating assembly components from Callies, and Mahle that meets Masts strict tolerances ensure their short blocks are the highest quality available on the market. Currently LS3, LS7, and X-blocks are available from 416 to 454 cubic inches. Assemblies are available with either a 24 or 58 tooth reluctor wheel and are available with the combination of forged Callies crank and forged Callies H-Beam connecting rods. Mahle Motorsports forged pistons are also used exclusively in every Mast short block.
GM Bare Block
Forged Callies Compstar Crank
Forged Callies Compstar H Beam Rods
Mahle Forged & Coated Pistons
ARP Main Studs
ACL Main & Rod Bearings
GM Gen IV Oil & Coolant Plugs
Mast Motorsports short blocks include the following:
- Mast Motorsports
- Special Order Item
- Item Requires Shipping
- 300.0 lbs.
- FREE 48 State Shipping
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