17B Jackson Street

Freehold, NJ 07728


350 Chevy

With Mass-Flow Fuel Injection

420 Horse Power

Toll Free: 1-800-267-3940


Chevy 350 with 420 HP EFI engine package can be custom designed to tailor to your specific needs. Engine can be custom painted to match your vehicle at your request. We can also equip your engine with the exclusive March Performance serpentine belt system.  We can also assist you in choosing the proper transmission and stall speed converter combination for your vehicle and have it shipped directly to you as your performance crate engine is being built. 

See Below How Our Engines Out Beat Our Competitors

Engine Specification Sheet

  • 4 bolt main block, one or two piece rear seal your choice

  • Cast steel Scat crankshaft assembled with tri metal Clevite 77 rod and main bearings

  • Scat I-beam connecting rods with ARP rod bolts (rated for over 500hp)

  • Speed-Pro high performance pistons with coated skirts

  • Hand filed performance rings

  • Three piece true double roller timing set

  • Hand selected performance camshaft to achieve the idle & throttle response to customerís desire

  • (16) New high rev lifters (anti-pump up)

  • Dart Pro One performance aluminum cylinder heads 64cc with 200cc intake runners

  • (8) Stainless steel 2.02 intake valves

  • (8) Stainless steel 1.60 exhaust valves

  • (16) High performance valve springs and retainers (to match camshaft)

  • 7/16 screw in studs and hardened guide plates 

  • (16) Chrome Moly push rods

  • (16) Performance true aluminum roller rockers

  • Engine will be assembled with all new bolts

  • High volume oil pump and screen

  • Chrome oil pan

  • Chrome dip stick and tube

  • Chrome timing cover

  • Professional products performance balancer

  • Fel-Pro performance gaskets

  • The complete rotating assembly will be balanced

  • Mass-Flow Fuel Injection System

    • Edelbrock Performer RPM Intake Manifold

    • 4 Valve 1000cfm Throttle Body

    • 8 27lb Fuel Injectors

    • Fuel Rails

    • Mass Air Flow Sensor

    • Pre-Tuned ECM

    • Wiring Harness

    • All Sensors Required To Make System Work

    • Mallory Distributor

    • Mallory High Voltage EFI Ready Coil Pack

  • Chrome thermostat housing

  • 14" Chrome air cleaner

  • 8 Autolite spark plugs

  • Custom fit Taylor 8mm ignition wires (color of choice black, red, blue, yellow, green, orange no extra charge) 

  • High flow cast iron water pump

  • Chrome valve covers

  • Chrome breather

  • Complete PCV ventilation system

  • All engines will come with starter and flex plate (for auto trans), additional $200 for manual transmissions.

  • Engines are photo documented during the building process so you can see the quality of parts and workmanship that goes into your engine.

  • Each engine is live run tested, timing set, and Fuel Injection System adjusted And Tuned for optimum performance
  • We video tape your live run engine, and send you a copy

All of our turnkey engines come with a 1 year warranty with unlimited mileage

Turn- Key Drop In Ready Price Only $ Call


Upgrade To A March Serpentine Belt Systems Below

Turn-Key Drop In Rady Small Block Chevy 350 420HP With March ALT Pulley Kit

Turn-Key Drop In Rady Small Block Chevy 350 420HP With March ALT, & PS Pulley Kit

Complete Turn-Key Drop In Ready Small Block Chevy Engine

350 420HP With March

Alternator Serpentine Kit

Add $870 To Base Price

350 420HP With March

Alt, & PS Serpentine Kit

Add $1,430 To Base Price

350 420HP With March

Alt, PS, & AC Serpentine Kit

Add $1,870 To Base Price



Whether your vehicle is a hot rod, street car, race car, or even a tow truck, here at Pro-formance Unlimited we are here to help design and build the combination that best suits your vehicles needs. Please browse our engine combinations listed below or custom design one of your own. Pro-formance Unlimited is best known for our precision custom designs. From that special built stroker engine to that turn-key drop in ready crate engines, call Doug or Steve we will be happy to answer any of your questions.

All engines are custom built to order for total customer satisfaction

Credit cards accepted

Call us today for a quote


420HP Short Block


420HP Long Block


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