BluePrint Engines B400FK700 SBC 400/500HP with 700R4, EFI

BluePrint's 400 combo steps up to 500 horsepower, built around a forged crankshaft and forged pistons under aluminum cylinder heads, with 510 lb-ft of torque on a 10.3:1 compression ratio. Fuel injection comes from a Holley Sniper 2 EFI system, bolted to a 700R4 automatic with a polished accessory drive up front.

What it is built for

The forged rotating assembly is aimed at builders who want more durability margin than a cast-crank combo offers at this power level, paired with electronic fuel injection for easier starting and drivability than a carburetor. BluePrint sets initial ignition timing at 10 to 16 degrees with total timing of 32 to 34 degrees by 3,500 rpm.

What to check before ordering

The included converter stalls at 2,200-2,400 rpm, with its flexplate and starter already in the box. Confirm your transmission tunnel and crossmember suit a 700R4 swap, and check header and accessory clearance for the polished front-drive hardware before ordering. California installations of this part fall under engine-change rules rather than direct-replacement rules, so check compliance with the Bureau of Automotive Repairs before finishing the swap.

Common questions

Is the crankshaft forged or cast? Forged, along with the pistons, for this 500-horsepower build.

Is there a carburetor on this engine? No — the Holley Sniper 2 EFI system handles fuel on its own.

Any flywheel needed on my end? No, the included flexplate covers that for this automatic 700R4 pairing.