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.
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 Stem | 11/32" |
| 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
| Lift | Intake CFM | Exh 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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