Sniper 24 Degree Big Block Chevy Racing Heads

Sniper Big Block Chevy
24° Conventional Port Heads

Starting at
$875.00 Each

Series P/N: 174 (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

  • 24 Degree OEM X275 Class Accepted Valve Angle
  • 119cc Heart Shaped Combustion Chamber
  • Up to 2.350 Intake & 1.850 Exhaust Valves
  • Accepts up to 1.625 O.D. Springs
  • 290cc, 320cc or 370cc 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 370cc 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 24 Degree Heads.

Sniper Big Block Chevy Heads by Pro-Filer

Series P/N: 174 Configuration Options


Intake Port Size
Chamber Size & Finish
Note: 119cc As Cast available only on 290cc & 320cc Runner.
119cc CNC Chamber N/C if you have 370cc Runner option.
Casting Style
Valve Seats
Note: Copper Allow Seats recommended for TI Valves
Valve JOB Size

Intake & Exhaust Valves
2.350/1.850 Only available on 370cc Runner Heads
Valve Springs
Includes Springs, Steel Retainers and Locks Note: 1.550" Springs only available on 290cc & 320cc Runner Heads.

Your choice or 290cc, 320cc or 370cc As Cast Intake Runners, 119cc As Cast or CNC Chambers, Steel or Copper Valves Seats, 2.250/1.880, 2.300/1.880 or 2.350/1.85 Stainless Valves and Seat Options. We also offer a option Valve Springs in 1.550 Dual Hydraulic or 1.650 Solid Roller Models.

Qty
Starting at
$875.00 Each

Series P/N: 174 (QTY & OPTIONS ADDED TO BASE PRICE AT CHECKOUT)

Details


Series P/N: 174 BBC Sniper Head Specifications

Material:Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Valve Angle: 24 Degree valve angle
Intake Port Volume & Shape: Modified Oval Port, Precision As Cast 290cc, 320cc or 370cc
Intake Port Flow: 290cc = 365cfm @.800" / 320cc = 395cfm @.800", 370cc = 400cfm @.800 lift.
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: 2.225" - 2.300" / +.250" long, 370cc Head (Only) 2.35" + .350 long.
Exhaust Valve Diameter:1.880" - 1.900" +.100" long. 370cc Head (only) 1.800"-1.850" .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: Steel or Copper Alloy
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:290cc Port - 396-468cid / 7000 rpm, 320cc Port 454-540cid / 7500 rpm, 370cc 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 (T & D and Jesel both have kits)
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 - 290cc Runner

Pro Filer Sniper Big Block Chevy Heads with 290cc Intake Runner, 2.28" Intake Valve and 1.88" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #174 BBC Sniper 290cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 142 129 91%
0.300 212 162 76%
0.400 271 198 73%
0.500 323 235 73%
0.600 365 255 70%
0.700 378 265 70%
0.800 380 268 71%

Air Flow Chart #174 - 290cc Runner

PN174 BBC Sniper 290cc Runner Air Flow Chart

Air Flow Detail #174 BBC Sniper Head - 320cc Runner

Pro Filer Sniper Big Block Chevy Heads with 320cc Intake Runner, 2.30" Intake Valve and 1.88" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #174 BBC Sniper 320cc Runner

LiftIntake CFMExh CFM% Exh/Int
0.200 164 129 79%
0.300 228 162 71%
0.400 288 198 69%
0.500 337 235 70%
0.600 380 255 67%
0.700 395 265 67%
0.800 392 268 68%

Air Flow Chart #174 - 320cc Runner

PN174 BBC Sniper 320cc Runner Air Flow Chart

Air Flow Detail #174 BBC Sniper Head - 370cc Runner

Pro Filer Sniper Big Block Chevy Heads with 370cc Intake Runner, 2.35" Intake Valve and 1.85" exhaust valve. Flow data based on Cylinder #1 intake and exhaust port. Flow measured at 28" of depression.

Air Flow Detail #174 BBC Sniper 370cc 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

Air Flow Chart #174 - 370cc Runner

PN174 BBC Sniper 370cc Runner Air Flow Chart

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