 Big Block Chevy 24 Degree Racing Cylinder HeadsRace Winning Performance out of the box...
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174 Series 24 Degree BBC Heads
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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!
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 larger then 320cc intake parts, please see our Sniper X CNC 24 Degree Heads.
290 cc Intake Port Model
Valve Angle: 24 Degree valve angle to provide you with bolt on compatibility for stock accessories
Intake Ports: Oval Shaped, Precision As Cast 290cc
Engine Size: 396-468cid / 7000 rpm
Application: High Performance (i.e. street / strip / marine)
Intake Port Design - Modified Oval Port
Intake Port Flow: 290cc = 365cfm @.800"
Combustion Chamber - Heart-Shaped/Fast-Burn,As-Cast/CNC - 119cc, can be reduced to 105cc
Milling: Angle - .0070" per cc Flat - .0050" per cc
Valve Spring Pocket - Maximum of 1.625" (no deeper)
Bore Spacing: Standard BBC 4.840"
Exhaust Valve: 1.880" - 1.900" / +.100" long
Intake Valve: 2.225" - 2.300" / +.250" long
Deck Thickness: 1/2" deck for Nitrous and Blown applications
Spark Plugs: Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Valve Guides: Manganese Bronze to assist in extending valve life .502" OD
Valve Train: Uses Stock or Most Aftermarket Rocker Systems (shaft mount recommended)
Valve Covers: Uses Standard Big Block Chevy
Head Bolts: Requires 1" longer head bolt next to exhaust ports
Valve Seats: Steel (Standard) or Copper Alloy
Accessories: Heads drilled and taped for standard accessories (alternator)
320 cc Intake Port Model
Valve Angle: 24 Degree (rolled two degrees)
Intake Ports: Oval Shaped, Precision As Cast 320cc
Intake Port Design - Modified Oval Port
Intake Port Flow: 320cc = 395cfm @.800"
Engine Size: 454-540cid / 7500 rpm
Application: High Performance (i.e. street / strip / marine)
Combustion Chamber - Heart-Shaped/Fast-Burn,As-Cast/CNC - 119cc, can be reduced to 105cc
Milling: Angle - .0070" per cc Flat - .0050" per cc
Valve Spring Pocket - Maximum of 1.625" (no deeper)
Bore Spacing: Standard BBC 4.840"
Exhaust Valve: 1.880" - 1.900" / +.100" long
Intake Valve: 2.225" - 2.300" / +.250" long
Deck Thickness: 1/2" deck for Nitrous and Blown applications
Spark Plugs: Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder
Valve Guides: Manganese Bronze to assist in extending valve life .502" OD
Valve Train: Uses Stock or Most Aftermarket Rocker Systems (shaft mount recommended)
Valve Covers: Uses Standard Big Block Chevy
Head Bolts: Requires 1" longer head bolt next to exhaust ports
Valve Seats: Steel (Standard) or Copper Alloy
Accessories: Heads drilled and taped for standard accessories (alternator)
Air Flow Charts
Ready to go, straight out of the box, the "Pro-Filer" BBC Standard Port solves every racers need of getting BIG power and BIG performance for little time and money.
| Note: Flow rates may vary for any number of circumstances due to valve job, valves, the flow bench used, test parameters, etc. |
| Note: Flow rates may vary for any number of circumstances due to valve job, valves, the flow bench used, test parameters, etc. |
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
Exhaust Gasket: Stock BBC
Head Gasket: 4.54 bore Cometic C5433 or Fel-Pro 1017
Head Gasket: 4.60 bore Cometic C5434 or Fel-Pro 1057
Valve Covers - Standard BBC Bolt Pattern Pro-Filer PN 191
Rockers: Standard BBC or shaft rockers (T & D, Jesel)
Pistons: Most 24 Degree Aftermarket
Valve Springs: Up to 1.625" Dia
Valve Spring Installed Height: Determined by Valve Height When Ordered
