MIDGET RACING ENGINE

The Mopar® Performance circle track race engine is designed for use in all midget series vehicles with a 166 cubic-inch limit. Dyno tested and factory sealed to ensure consistent output. This complete dyno tested aluminum A4 engine includes injector stacks, fuel pump, ignition box and wires, all wires and harnesses and W9 cylinder head.

Horsepower: 350 horsepower at 7200 rpm
Torque: 265 lb-ft at 6000 rpm.
Midget Racing Engine
*P5007961

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.

A-4 ENGINE ALUMINUM MIDGET RACE BLOCKS

Designed for USAC Midget and Drag Racing. These lightweight blocks come with steel billet caps, ductile iron sleeves and hardware kit.

Block, Midget, P9 Head
*P5153612

Block, Midget, W9 and W9RP Head
*P5007466

Block, Drag, P5 Head
*P5007467

Block, Drag, P9 Head
*P5153903

Block, Drag, W9 and W9RP Head
*P5007636AB

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.

ALUMINUM DRAG RACE BLOCK

This aluminum drag race block features a full bell housing, a 4.130" unfinished bore and 9.00" deck height. Block comes with cast iron sleeves, billet aluminum main caps, main cap stud kit and hardware.

Drag Race Block A-4
(P5 Cylinder Head)
*P5007467

Drag Race Block A-4
(W9 and W9RP Cylinder Heads)
*P5007636

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.

W9 ALUMINUM CYLINDER HEADS

Designed with the professional racer in mind, W9 Aluminum Cylinder Heads incorporate the latest in paperless design technology” to give racers the leading edge. These W9 heads feature high-strength, lightweight A356 aluminum alloy coasting. Their thick decks permit small chambers for maximum compression ratios. Heads feature 6-bolt head attachment design for sealing integrity, and raised intake and exhaust ports for maximum performance. They are the same length as the block to permit ease of installation with engine plates. Available in 13 or 15 degree valve angles, heads include additional material to permit “rolling.” Machined for 5.540"intake and 5.560" exhaust valves, and accept 5-bolt Mopar valve cover and gasket.

W9 Aluminum Cylinder Head
15 degree valve angle
(Small Block, A-4 Midget Block)
*P5007855

W9 Aluminum Cylinder Head
13 degree valve angle
(Small Block, A-4 Midget Block)
*P5007861

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.

W9 RAISED PORT ALUMINUM CYLINDER HEAD

The partially machined W9 Cylinder Heads with raised intake and exhaust ports is recommended for use in Sprint and Midget cars.

Features High-strength, lighweight A 356 aluminum alloy casting

Ports raised significantly higher than standard W9 Cylinder Heads

Machined deck, intake surface, head bolts and valve cover rail

Ports allow flexibility for porting (requires porting)

Chamber is cast filled in to allow very small machined chamber

Requires machining for valve guides, spark plugs, intake screws, porting chamber, valve spring pockets, rocker stands, and injectors

Designed for 13-degree valve angle

For use on 48-degree V8 and 4-cylinder blocks

Recommended valve length: 6.040" intake and 6.060" exhaust

6-bolt head attachment design

Accepts 5-bolt Mopar valve cover and gasket

Recommended for use with T&D rocker arms with 0.750" offset

W9 Raised Port Aluminum Cylinder Head
(Small Block, A-4 Midget Block)
*P5007904

W9 Cylinder Head, Aluminum, Raised Port,
with Extra Stiffening Ribs, Small Block, A4 Midget Block
*P5007904AB

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.

MIDGET CRANKSHAFTS (A4)

This fully machined, 4340 steel Midget Crankshaft features a six-bolt generic pattern on the crank flange.

Crankshaft, Billet, Midget, 3.075" Stroke with 1.888" Rod Journals, A4 Block
*P5153520

Crankshaft, Forged, Midget, 3.075" Stroke with 2.000" Rod Journals, A4 Block
*P5007907

This unmachined, 4340 forged steel Midget Crankshaft allows you to cut custom cranks. Requires complete machining.

Crankshaft, Forged, Unmachined, Midget, 3.00"–3.25"
Approx. Stroke, A4 Block
*P5007573

*Not legal for sale on pollution-controlled vehicles or vehicles registered for highway use.