GM 400 product header
GM 400 • Base Engine • Aluminum Heads • Roller Cam
HP & Torque: 508 HP / 473 FT LBS
Compression Ratio: 10.3:1
Aluminum Heads
Forged Pistons
Roller Cam
Forged Crank
Part #: BP4002CT1


BRAND NEW BluePrint Cast Iron Block
4 Bolt Mains
Square and parallel decked
Align honed main bearing bore
Cylinders are sonic tested for thickness
Cylinders honed on computer controlled machine to within .0002 straightness and roundness

Rotating Assembly:

New forged crankshaft — 3.750" stroke & 5.7" rods
GM connecting rods
150,000 psi rod bolts
Forged pistons
Hastings moly rings
Rotating assembly balanced to within 2 grams
High volume oil pump
Hydraulic roller cam
Roller lifters

Cylinder Heads:

BluePrint aluminum — 64cc chamber
Hardened retainers and springs
2.08 swirl polished intake valves
1.60 swirl polished exhaust valves

BP Aluminum Head Part# HP8103
For complete head specs, click here

Cam Specs:

Cam Type: Roller
.555 Intake .576 Exhaust
236 Intake / 242 Exhaust duration
@ .050 - 110° lobe separation

Ignition Timing:

10-16° initial and total timing 32-34° at 3500 RPM

Also Includes:

Valve covers, oil pan and timing cover
Brass freeze plugs
Dyno test results shipped with engine


30 month / 50,000 mile


NEW BluePrint block manufactured
and machined in the USA!

Not for EGR

Share this Engine!

BP GM Product Line

GM Performance Engines

GM Pro Series Engines

GM Shortblocks