Sniper 24 Degree Big Block Chevy Racing Heads

Sniper Big Block Chevy 375cc 24° Conventional Port Heads

P/N: 174-32A-03

  • 24 Degree OEM Valve Angle
  • 119cc Heart Shaped Combustion Chamber
  • 2.300" Intake & 1.880" Exhaust Valves
  • Accepts up to 1.625" O.D. Springs
  • 375cc Intake Ports Available
  • Made in the U.S.A.

This is where it all began... a powerful, out-of-the-box cylinder head design matched with an outstanding, unbeatable aerospace casting technology. And we are here to tell you... It has only gotten better! Now with up to a 375cc Intake Port flowing to 400cfm AS CAST, the Pro-Filer Sniper can make some serious HP.

The Pro-Filer Sniper Series of BBC heads have proven over and over again that performance and power are the heart and soul of our product. From the high velocity, PRECISION As-Cast ports to the Fully CNC Ported Castings, Pro-Filer continues to deliver what you need to be the "Big Dog"!

For even more higher flow, check out see our Sniper X Fully CNC Ported 375cc 24 Degree Heads.

Sniper Big Block Chevy Heads by Pro-Filer

Details


P/N: 174-32A-03 375cc BBC Sniper Head Specifications

Material:Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 24 Degree valve angle
Intake Port Volume & Shape: Rectangular Port, Precision As Cast 375cc
Intake Port Flow:375cc = 400cfm @.800 lift.
Exhaust Port Shape: Round, Raised Port, Precision As Cast
Combustion Chamber: Heart-Shaped/Fast-Burn,As-Cast/CNC - 119cc, can be reduced to 105cc
Milling:Angle - .0070" per cc Flat - .0050" per cc
Spring Pocket:Maximum of 1.625" (no deeper)
Bore Spacing: Standard BBC 4.840"
Intake Valve Diameter: 2.300" +.250" long
Exhaust Valve Diameter:1.880" +.100" long
Deck Thickness:1/2" deck for Nitrous and Blown applications
Valve Guides:Manganese Bronze to assist in extending valve life .502" OD
Valve Seats: 45° Ductile Iron
Valve Stem11/32"
Valve Covers:Uses Standard Big Block Chevy
Spark Plugs:Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Valve Train:Uses Stock or Most Aftermarket Rocker Systems (shaft mount recommended)
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 Port 565cid 8500rpm.
Application: High Performance (i.e. street / strip / marine)

Parts and Accessories

Intake Manifold:Pro-Filer Sniper Jr. Single Plane, Sniper Single Plane or Sniper Tunnel Ram
Intake Gasket: Special Pro-Filer Cometic PN IR250060KF
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 (Jesel or T&D P/N 3211-170/170)
Pistons: Most 24 Degree Aftermarket
Valve Springs:Up to 1.625" Dia
Valve Spring Installed Height:Determined by Valve Height When Ordered

Air Flow Detail #174 BBC Sniper Head - 375cc Runner

Pro Filer Sniper Big Block Chevy Heads with 375cc Intake Runner, 2.300" Intake Valve and 1.880" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #174 BBC Sniper 375cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 148 128 86%
0.300 217 170 78%
0.400 286 205 72%
0.500 345 238 69%
0.600 396 298 75%
0.700 435 314 72%
0.800 450 325 72%
0.900 455 N/A N/A

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