Sniper 24 Degree Big Block Chevy Racing Heads

Sniper X 24° CNC Ported
375cc BBC Cylinder Heads

P/N: 174-X-C37-03

  • 100% CNC Ported Ports & Chambers for Mega Flow
  • 24 Degree OEM X275 Class Accepted Valve Angle
  • 119cc Heart Shaped Combustion Chamber
  • 2.350 Intake & 1.850 Exhaust Valves
  • Works with Standard BBC Pistons

The Sniper X cylinder head is the latest BBC head offered in the Sniper Series. Designed with the most up to date technology available, the Sniper X head flows over 460cfm on a 375cc runner and over 325cfm on the exhaust! We started with the most sound casting available and then spent months developing the best port and chamber for a 24° head.

All heads are 100% CNC ported including the chamber and features a 5 angle valve job with .350" longer intake valves and .100" longer exhaust valves. The Sniper X uses standard BBC parts including available Jesel and T&D shaft rockers or you can use standard stud mounted rockers. As an added bonus, the Sniper X maintains standard BBC valve centerlines so it works with regular BBC pistons.

When your ready to put your 565 cid or larger BBC up against the world, the Sniper X head is for you.

Sniper Big Block Chevy Heads by Pro-Filer

Details


P/N: 174-X-C37-03 375cc BBC Sniper X Head Specifications

Material:Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 24° valve angle to provide you with bolt on compatibility
Intake Port Volume & Shape: Rectangle-Shaped, Fully CNC Machined 375cc
Exhaust Port Shape: Round, Raised Port, Fully CNC Machined
Intake Port Flow:375cc = 481 cfm @1.000
Combustion Chamber: CNC Finished - 119cc (Milled 105cc) New design to promote wet-flow and efficiency!
Milling:Angle - .0070" per cc Flat - .0050" per cc
Valve Spring Pocket:Maximum of 1.625" (no deeper)
Bore Spacing: Standard BBC 4.840"
Intake ManifoldAll conventional manifolds will bolt right up (Some port matching may be required)
Pistons Standard BBC Pistons
Head Bolts/StudsRequires 1" longer than stock head/bolt or stud next to exhaust ports
Valve DiameterIntake 2.350" 11/32" Stem, Exhaust - 1.850" 11/32" Stem
Valve Length:Intake 5.525" (2.100" Install), Exhaust 5.540" (2.100" Install)
Valve Seat:50° - Ductile Iron Material
Deck Thickness:1/2"
Valve Guides:Manganese Bronze to assist in extending valve life .502" OD
Valve Train:Jesel or T&D P/N 3211-170/170
Spark Plugs:Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Head Bolts: Requires 1" longer head bolt next to exhaust ports
Accessories: Heads drilled and taped for standard accessories (alternator mount holes)
Engine Size:375cc - 540cid + /8500rpm
Application: High Performance (i.e. strip / marine)

174X Parts and Accessories

Intake Manifold:Pro-Filer Sniper Jr. Single Plane, Sniper Single Plane or Sniper Tunnel Ram
Intake Gasket: Call
Valve Cover Gasket: Stock BBC Fel-Pro 1635
Exhaust Gasket: Std BBC (match to header size)
4.375 Bore Head Gaskets: Cometic C5329-XXX (xxx = thickness)
4.54 Bore Head Gaskets: Cometic C5330-XXX (xxx = thickness) or Fel-Pro 1017
4.63 Bore Head Gaskets:Cometic C5331-XXX (xxx = thickness) or Fel-Pro 1057
Valve Covers:Standard BBC Bolt Pattern Pro-Filer PN 191
Rockers:Standard BBC or shaft rockers (T&D P/N 3211-170/170)
Pistons: Most 24 Degree Aftermarket
Valve Springs:Up to 1.625" Dia
Valve Spring Installed Height:2.100"

Air Flow Detail #174-X-C37-03 375cc BBC Sniper CNC Head - 375cc Runner

Pro Filer Sniper CNC Big Block Chevy Heads with 375cc Intake Runner, 2.350" 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 BBC CNC Sniper 375cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 153 128 84%
0.300 239 170 71%
0.400 300 205 68%
0.500 365 238 65%
0.600 410 298 73%
0.700 445 314 71%
0.800 460 325 71%

Air Flow Chart #174X - 375cc Runner

PN174X BBC CNC Sniper 375cc Runner Air Flow Chart

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