416 4.00 stroke sleeved block 900-1600 Hp GM LT LT1 LT4 Gm Performance new

LT1 LT4 Gm Performance new block in sealed GM crate manufacturer part number 19431901

Mesa Balancing Racing Engines  will help you get the most out of your blower or turbo with this short block combo

fit in house and  hand assembled as ordered to insure order accuracy

Proven reliable at 1100hp to the ground

Crankshaft journals polished to 2 Ra or better surface finish

416 4.00 stroke sleeved block 900-1600 Hp GM LT LT1 LT4 Gm Performance newMBRE completely machines balances and assembles these engines in house with the same 4340 crankshafts 4340 Hbeam rods and forged pistons as all of our combinations. By sleeving these blocks we have had the best reliability for higher Hp builds. We stock sleeves and components for quick delivery.