Pontiac 455 with 425 HP engine package with cast iron cylinder heads can be custom designed to meet your specific needs. All engines can be custom painted to match your vehicle at your request. We can outfit 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.

• A 455 Pontiac block

• Block will be bored and plate honed accordingly "painted color of choice"

• All new cam bearings, freeze plugs and oil galley plugs

• Precision ground cast iron crankshaft assembled w/tri metal cleveite 77 rod and main bearings

• Set of shot peened stress relived  I-beam connecting rods w/ARP rod bolts

• New set of high performance pistons

• Assembled with a set of hand filed performance rings

• New three piece true double roller timing set

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

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

• A set of 455 Pontiac cylinder heads (we hand assemble each head to achieve the proper spring pressure & installed height to match the exact application designed for your engine) 

• (16) Chrome moly push rods

• (16) Scorpion aluminum roller rockers w/1.65 ratio (with all new rocker balls and nuts)

• Engine will be assembled with all new bolts

• High volume oil pump and screen

• New chrome oil pan

• New chrome dip stick and tube

• New timing cover

• A reclaimed valley pan

• Professional Products performance balancer

• Fel-pro performance gaskets

• The complete rotating assembly will be balanced

• Edelbrock Performer  intake manifold   

• New chrome thermostat housing

• Edelbrock carburetor w/ electric choke 

• New chrome air cleaner

• MSD Pro-Billet distributor

• MSD Blaster II coil and bracket

• MSD 6AL ignition control

• (8) AC Delco spark plugs

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

• New high flow cast iron water pump

• New set of chrome valve covers

• New chrome breather

• Fel-Pro Performance Gaskets

• Flex plate (for auto transmission)

• 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 carburetor adjusted for optimum performance

• We video tape your live run engine and send you a copy

March Performance

Alt, & PS Serpentine Kit

Add $1,430  To Base Price

March Performance

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

1-800-267-3940