BPE: 30 month and 50.000 mile warranty applies to individual or professional installations, is fully transferable, and covers engines worldwide.
GM: 24 month and 50,000 mile warranty when installed by a GM Dealer or qualified installing independent Service Center (ISC) or when sold over the counter and REPAIRED by a GM Dealer or qualifying ISC. Parts only when consumer repaired or installed in non-highway application. Coverage limited to defects in material and/or workmanship of the specific part only. Warranty valid when all required components are installed on the same vehicle and purchased on one invoice.
BPE: aluminum heads with 2.02/1.60 valves and roller rockers uses standard valve covers
GM: cast iron Vortec with 1.94/1.50 valves and stamped steel rockers,
BPE: comes with aluminum water pump, fuel pump, carburetor, HEI and wires, spark plugs, air cleaner and a dyno sheet.
GM: comes with a cast iron water pump
The only advantage for the GM is a forged crankshaft and forged rods where BPE uses a cast steel crankshaft and Chevy heavy beam rods with 150,000 psi bolts.
But for the extra $600+ you get an engine that puts out 113 horsepower less than the BPE