A brand new GM block with top-shelf components. From the master engine builders at Katech. Install it yourself, or have us do it for you. Want to win? This premier street engine includes:

• Production LSA block – Stronger than the LS3 blocks, CNC stroker clearanced
• 58x or 24x Callies forged crankshaft – 4-inch stroke
• Callies forged connecting rods
• CP-Carillo forged 4.070 pistons/rings/pins
• 10.9:1 Compression ratio with a stock LS3 chamber
• Clevite bearings
• Block oil/coolant plugs included

Valley cover and rear cover sold separately

In stock & ready to ship!