Alan Johnson Performance Engineering

AJPE Cylinder Heads

Chrysler-Hemi / Top Fuel Stage I
Chrysler-Hemi / Top Fuel Stage II
Chrysler-Hemi / Alcohol Stage I
Chrysler-Hemi / Alcohol STG II
481x Billet Alcohol
481x Cast Supercharged Alcohol Heads
12 Degree S.B. Chevrolet Cylinder Heads
18 Degree S.B. Chevrolet Cylinder Heads
23 Degree S.B. Chevrolet Cylinder Heads
5.0" Pro-Stock Cylinder Heads

 

Chrysler-Hemi / Top Fuel Stage I

The Alan Johnson Performance Engineering billet Chrysler-Hemi cylinder heads have dominated Top Fuel Drag Racing in the 1990s. The product of countless hours of R&D, both in house and on the race track, these heads have supplied the performance to set records, win races, and clinch Championships. As the pioneer in 100% CNC ported billet heads, AJPE has enabled Top Fuel tuners to achieve much greater consistency, another benefit of the superior technology, materials and man-power incorporated at AJPE. Available either bare or fully assembled, machined for 2.375" x 2.000" valves. Please note that all AJPE Chrysler-Hemi cylinder heads must be used with an AJPE supercharger manifold. AJPE also offers complete repair service and support staff to serve you.

Standard Features Include:
100% CNC Porting
3/8" Dia. Rocker Dowels
9/16" Stud Holes
Enderle Down Nozzle Prep.
TFX Stud Holes
Intake Port O-Rings

Options Available at No Extra Cost:
1/2" Head Stud Inserts
3/8" or 11/32" Exhaust Guides
4.187", 4.250" or 4.310" Bore Size

Extra Cost Option Available:
Lightening
.051 Stainless O-Ring Wire

Part # 01A-001 Chrysler-Hemi Top Fuel Cylinder Heads STG I ~ Bare With Shoes

Includes:
(8) Standard Intake Seats(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(8) Short Push Rod Tubes
(8) Long Push Rod Tubes
(8) Inner Head Stud Inserts
(8) Steel Exhaust Guide Shoes
(8) .051 O-Ring Wire
(8) Intake Port O-Rings
(8) Set Screws
(10) 3/8" Dowel Pins
(16) Spark Plug Tube O-Rings
(16) Guide Screws
(16) 9/16" Head Bolt Washer Inserts
(4) 3/8" Head Bolt Washer Inserts

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Chrysler-Hemi / Top Fuel Stage II

The Alan Johnson Performance Engineering billet Chrysler-Hemi cylinder heads have dominated Top Fuel Drag Racing in the 1990s. The product of countless hours of R&D, both in house and on the race track, these heads have supplied the performance to set records, win races, and clinch Championships. As the pioneer in 100% CNC ported billet heads, AJPE has enabled Top Fuel tuners to achieve much greater consistency, another benefit of the superior technology, materials and man-power incorporated at AJPE. Available either bare or fully assembled, machined for 2.375" x 2.000" valves. Please note that all AJPE Chrysler-Hemi cylinder heads must be used with an AJPE supercharger manifold. AJPE also offers complete repair service and support staff to serve you.


Standard Features Include: Options Available at No Extra Cost:
100% CNC Porting
3/8" Dia. Rocker Dowels
9/16" Stud Holes
Enderle Down Nozzle Prep.
TFX Stud Holes
Intake Port O-Rings
.051 Stainless O-Ring Wire

Options Available at No Extra Cost:
1/2" Head Stud Inserts
3/8" or 11/32" Exhaust Guides
4.187", 4.250" or 4.310" Bore Size

Extra Cost Option Available:
Lightening

Part # 01A-002 Chrysler-Hemi Top Fuel Cylinder Heads STG II ~ Bare with Shoes

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(8) Short Push Rod Tubes
(8) Long Push Rod Tubes
(8) Steel Exhaust Guide Shoes
(8) Inner Head Stud Inserts
(8) .051 O-Ring Wire
(8) Intake Port O-Rings
(8) Set Screws
(10) 3/8" Dowel Pins
(16) Spark Plug Tube O-Rings
(16) Guide Screws
(16) 9/16" Head Bolt Washer Inserts
(4) 3/8" Head Bolt Washer Inserts

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Chrysler-Hemi / Alcohol Stage I

These cylinder heads are the dominant force in alcool racing. They are 100% CNC ported for exact duplication. With intake flow up to 540 CFM plus any combination of valve sizes, the possibilities are endless. They come either fully assembled or bare. Must be used with an AJPE supercharger manifold. They come with 2.375 x 2.00 valve sizes. Alan Johnson Performance Engineering also offers a complete repair service, and support staff to serve you.

Options Available:
Lightening
Head Stud Inserts
Bore Sizes 4,187, 4.250, 4,310
Exhaust Guide Sizes

Part # 01A-021 Chrysler-Hemi Alcohol Cylinder Heads STG I ~ Bare No Shoes

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(8) Short Push Rod Tubes
(8) Long Push Rod Tubes
(8) Inner Head Stud Inserts
(8) .051 O-Ring Wire
(8) Intake Port O-Rings
(8) Set Screws
(10) 3/8" Dowel Pins
(16) Spark Plug Tube O-Rings
(16) Guide Screws
(16) 9/16" Head Bolt Washer Inserts
(4) 3/8" Head Bolt Washer Inserts

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Chrysler-Hemi / Alcohol STG II

These heads are machined from billet 6061 T-6 aluminum, and provide the same air flow characteristics as their Top Fuel cousins. They are the first choice of many Alcohol Dragster and Funny Car teams. They are also very popular with Drag Boats, A-Gas, Nostalgia, and truck and tractor pulling competitors. Must be used with an AJPE supercharger manifold. They are 100% CNC ported, and come fully machined, ready for assembly with 2.400" x 1.950" diameter valves.


Standard Features Include:
100% CNC Porting
3/8" Diameter. Rocker Dowels
9/16" Stud Holes
Enderle Down Nozzle Prep.
.051 Stainless O-Ring Wire
TFX Stud Holes
Intake Port O-Rings

Options Available at No Extra Cost:
1/2" Head Stud Inserts
3/8" or 11/32" Exhaust Valve Guides
4.187", 4.250" or 4.310" Bore Size

Options Available at an Extra Charge:
Lightening

Part # 01A-022 Chrysler-Hemi Alcohol Cylinder Heads STG II ~ Bare No Shoes

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(8) Short Push Rod Tubes
(8) Long Push Rod Tubes
(8) Inner Head Stud Inserts
(8) .051 O-Ring Wire
(8) Intake Port O-Rings
(8) Set Screws
(10) 3/8" Dowel Pins
(16) Spark Plug Tube O-Rings
(16) Guide Screws
(16) 9/16" Head Bolt Washer Inserts
(4) 3/8" Head Bolt Washer Inserts

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Chrysler-Hemi / 481x Billet Alcohol


The 481x is the most exciting power plant to appear in super-charged alcohol racing in years. Dyno and track testing is rapidly showing it to produce superior torque and horsepower. Combining "bullet proof" valvetrain, and ease of serviceability, these features add up to make it the obvious choice for the serious competitor. They are available fully machined and 100% CNC ported, with 2.400"x 1.910" valves, 72 cc chamber, and .051 stainless o-ring wire installed.

Valvetrain Features Include:
• Light weight, but strong, straight billet 7075 rockers with oversized shafts.
• One piece rocker mounting "girdle". The entire assembly is quickly and easily removed with 9 studs and nuts.
• Pushrod angularity is eliminated. The pushrods are straight in line with the lifters.
• Valve action follows camshaft design with no "lost motion".
• Short pushrods reduce weight, while integral guides incorporated into the heads limit pushrod flexing.

Serviceability Features Include:
• Cylinder Head / Manifold design allows removal of individual heads without disturbing the intake manifold and supercharger.
• Intake ports seal with o-rings.
• Front mounted magneto provides clearance for cylinder heads and supercharger drive belt.
• External mounted oil pump eases bottom end maintenance.

Part # 01B-001 A.J. 481x Billet Alcohol Cylinder Heads STG I ~ Without Girdles

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(8) Short Push Rod Tubes
(8) Intake Port O-Rings
(8) .051 O-Ring Wire
(4) 3/8" Head Bolt Washer Inserts
(10) Helicoils
(28) 1/2" Head bolt Washer Inserts

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481x Cast Supercharged Alcohol Heads

Cast solid from 355 T-6 aluminum alloy, these heads were designed for the performance demanding competition found in IHRA Pro-Modified drag racing. These heads share all of the same innovative technology found in the Billet 481x versions. Standard features are 72cc chambers, 2.400" x 1.910" valves, intake o-rings and .051" stainless o-rings. They are available 100% CNC ported, fully machined and ready for assembly.


Part # 01B-021 A.J. 481x Cast Alcohol Cylinder Heads STG I ~ Without Girdles

Includes:
(8) Standard Intake Seats (8) Standard Exhaust Seats
(8) Standard Intake Guides (8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts (8) .051 O-Ring Wire
(10) Helicoils (16) 481x Pro-Mod Intake Port O-Rings
(8) Intake Spacers with Hardware & O-Rings (4) 3/8" Head Bolt Washer Inserts
(28) 1/2" Head bolt Washer Inserts

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12 Degree S.B. Chevrolet Cylinder Heads

Alan Johnson Performance Engineering 12 degree cylinder heads for 410 Outlaw Sprint and Late Model applications. Our newest design for large cubic inch S.B. Chevrolet, the heads feature substantially raised intake ports to provide increased horse power and torque. Valve sizes are 2.200" x 1.580", with spacing optimized for 4.125" and larger bores. Standard 36cc chambers out of the box allow high compression ratios with flat top pistons. 100% CNC porting and machining guarantees the finest quality and accuracy in every cylinder head Alan Johnson Performance Engineering sells. These heads come fully machined and ready for assembly.


Part # 01C-003 Small Block Chevrolet 12 Degree Cylinder Heads ~ Bare

Includes:
(8) Standard Intake Seats (8) Standard Exhaust Seats
(8) Standard Intake Guides (8) Standard Exhaust Guides
(10) Helicoils
(28) 1/2" Head bolt Washer Inserts

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18 Degree S.B. Chevrolet Cylinder Heads


Alan Johnson Performance Engineering 18 degree cylinder heads for 410 Outlaw Sprint and Late Models. Entirely new castings of specially heat treated 355 alloy have substantially increased water jacket volume, to aid cooling efficiency and reduce weight, while eliminating cracking and porosity problems common with other heads on the market. Superior raised intake port design provides high velocity, and air flow, with moderate port volume and cross sectional area. 100% CNC porting ensures the highest accuracy and consistency. Fully machined and ready for assembly with 2.180" x 1.600" valves. These heads have 53cc chambers as shipped.

Standard Options at No Charge:
Rev Kit Machining
Exhaust Flange Lightening
Down Nozzles Machined

Options Available at an Extra Charge:
1.625" Exhaust Valve & Corresponding
Port Enlargement
2.200" Intake Valve

Part # 01C-009 Small Block Chevy 18 Degree Cylinder Heads ~ Bare

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(10) Helicoils

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23 Degree S.B. Chevrolet Cylinder Heads

Alan Johnson Performance Engineering 23 degree style cylinder heads for 360 Sprint and Late Model applications. The latest technology in raised intake and exhaust port design makes these the most advanced 23 degree style cylinder heads yet! CNC technology combined with unique port configuration deliver superior flow characteristics, while maintaining a very conservative cross sectional area. These heads share the same casting as their 12 and 18 degree bigger brothers with the same improvements over competing cylinder heads already on the market. Specially designed for cylinder bores in the the 4.00" to 4.060" range, with valve sizes of 2.150" x 1.525". With chamber volume set at 54cc, they come completely machined and ready for assembly out of the box.

Options Available at an Extra Charge:
Machine for Down Nozzles.

Part # 01C-014 Small Block Chevy 23 Degree Cylinder Heads ~ Bare

Includes:
(8) Standard Intake Seats
(8) Standard Exhaust Seats
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(10) Helicoils

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5.0" Pro-Stock Cylinder Heads
Alan Johnson Performance Engineering 5.0" bore center Pro-Stock cylinder heads designed for large cubic inch engines. These heads bring AJPE's famous CNC technology to the "mountain motors" used in IHRA Pro-Stock, Fastest Street car competition, and truck and tractor pulling. Valve sizes are 2.600" x 1.925", configured to fit 4.750" to 4.800" cylinder bores. Extensive R & D has allowed us to develop a superior port design, with the flow and velocity necessary for optimum horse power and torque production. A newly redesigned casting of 355 alloy eliminates problems of porosity and cracking common in this type of cylinder head. 100% CNC porting and machining ensures the utmost accuracy, while reducing the amount of preparation normally needed for this class of cylinder head. These heads come fully machined with one piece rocker mounting bars of 7075 billet provided with each set.

Part # 01D-001 5.0" Pro-Stock Cast Cylinder Heads

Includes:
(8) Standard Intake Seats - Copper Alloy
(8) Standard Exhaust Seats - Copper Alloy
(8) Standard Intake Guides
(8) Standard Exhaust Guides
(16) Bronze Valve Guide Inserts
(28) 7/16" Head Bolt Washer Inserts
(2) Billet 7075-T6 Girdle Plates
(32) 5/16" Rocker Stand Hold Down Stud
(16) 7/16 x 1" 12 Point Bolts
(1) -12 Water Fitting
(1) Water Inlet Plug Broched
(32) 5/16" 12 Point Nuts

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