The balanced rotating assembly (typically includes crankshaft, pistons, rings, connecting rods, rod bearings, and balancer) featured in this engine:

• 3.980" stroke nodular iron crank
• 6.488" big beam forged rods with ARP rod bolts
• 10 to 1 compression forged pistons

More special features of this engine include:

• Seasoned 2-bolt main block. This is a 390 block that has been sonic tested and bored out to a 428
• New Hydraulic flat tappet cam with .536"Int/.562"Exh valve lift
• Heads are big port cast iron heads with 2.090"Int/1.650"Exh stainless swirl polished valves with undercut stems for improved flow
• New Hardened exhaust seats for use with leaded or unleaded fuel
• New 1.440" high performance springs set up to match cam
• New Spiral-type valve guides
• New Perfect Circle rings
• New Double row timing set
• New High volume oil pump with steel drive shaft and bolt on oil pickup tube
• New Brass expansion plugs
• New Edelbrock Performer RPM aluminum intake manifold. This dual plane intake constant cross-sectional area design builds low end and mid-range acceleration while optimized runner path make top-end hp
• For those of you that have the hood clearance we will include a 2" high intake to carb spacer to increase plenum volume. This spacer increases the carb-to-plenum floor distance which atomizes the fuel better and also enhances low-rpm torque and throttle response. This engine takes a square bore carb. It works best with a 750cfm carb (not included)
• All parts are painted separately before assembly for that show quality look

This engine comes completely assembled with oil pan, timing cover, harmonic balancer, valve covers, and intake manifold.