Sniper 24 Degree Big Block Chevy Racing Heads

Hitman X 12° Spread Port CNC Machined Big Block Chevy Cylinder Heads

Starting at
$3250.00 Each

Series P/N: 184X (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

  • Accepts up to 1.655 O.D. Springs
  • Bronze valve guides reduce stem wear
  • Pro-Stock Port Design promotes high intake port velocity
  • 62cc, 72cc or 74cc Nitrous Friendly Chambers
  • 2.400" Intake / 1.880 Exhaust Valves
  • Made in the U.S.A.
Hitman Big Block Chevy Heads by Pro-Filer

The Hitman X is an awesome choice when building an engine to use power adders such as nitrous and superchargers. You can now choose the perfect runner and chamber for your bigger applications. The CNC 490cc intake port is available with a 62cc, 72cc, or 74cc chamber.

Series P/N: 184X Hitman CNC Configuration Options


Chamber Size & Finish
Casting Style
Valve Guide Size
Assembly Options
Add TI Valves, Springs, Steel Retainers and Locks

Includes Copper Alloy Valve Seats with finished Valve Job and 490cc CNC Intake Runners. Optional 60cc, 72cc, or 74cc CNC Chambers and 5/16 or 11/32 Valve Guides.

We also offer a Titanium Valve and Spring Package with .850 Lift 1.650 dia Dual Roller Springs with Retainers and Locks.

Qty
Starting at
$3250.00 Each

Series P/N: 184X (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

Details


Series P/N: 184X BBC Hitman Head Specifications

Material:Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 12 Degree valve angle
Intake Ports: Spreadport Location Oval-Shaped, Fully CNC Machined 490cc
Exhaust Valve Diameter:1.850" - 6.800 long (2.200 Install)
Intake Valve Diameter:2.450" - 6.800 long (2.200 Install)
Deck Thickness:1/2" deck for Nitrous and Blown applications
Valve Guides:Manganese Bronze to assist in extending valve life
Bore Spacing: Standard BBC 4.840"
Spring Pocket:Maximum of 1.655 (no deeper)
Valve Seats: Copper Alloy
Combustion Chamber: Heart-Shaped, CNC 62cc, 72cc & 74cc
Milling: .005 per cc flat milling, .007 per cc angle milling
Spark Plugs:Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Valve Covers: Uses Pro-Filer PN 190
Valve Diameter: 2.450" intake / 1.885 Exhaust
Valve Train: Shaft rockers (T & D, Jesel)
Engine Size:565+ cid / 9000 RPM
Application: High Performance (i.e. street / strip / marine)
Intake Manifold:Profiler Hitman Series 208 Single Plane or Hitman Series 187 Tunnel Ram

Air Flow Detail #184X BBC Hitman CNC Head - 490cc Runner

Pro Filer Hitman X CNC Big Block Chevy Heads with 490cc Intake Runner, 2.450" Intake Valve and 1.850" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #184X - 490cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 150 105 70%
0.300 234 154 66%
0.400 311 197 63%
0.500 382 240 63%
0.600 492 286 58%
0.700 511 313 61%
0.800 522 343 66%
0.900 540 355 66%

Air Flow Chart #184X - 490cc Runner

PN184X BBC CNC Hitman 490cc Runner Air Flow Chart

Air Flow Detail #184X BBC Hitman CNC Head - 515cc Runner

Pro Filer Hitman X CNC Big Block Chevy Heads with 515cc Intake Runner, 2.450" Intake Valve and 1.850" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #184X 515cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 155 130 84%
0.300 234 183 78%
0.400 311 238 77%
0.500 390 293 75%
0.600 450 325 72%
0.700 511 348 68%
0.800 541 368 68%
0.900 555 380 68%
1.000 561 388 69%

Air Flow Chart #184X - 515cc Runner

PN184X BBC CNC Hitman 515cc Runner Air Flow Chart

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