The Hitman Big Block Chevy
Tunnel Ram Intake Manifold

Race Winning Performance out of the box...
  • Cast bosses for injectors
  • Available in dual or single top
  • Precision cast and tuned runners.
  • Made in the U.S.A.
  • Hitman Spread Port Tunnel Ram - Pro-filer 187 Series Dual Four Top
  • Hitman Spread Port Tunnel Ram - Pro-filer 187 Series Single  Four Top
187 Series Hitman BBC Spreadport Tunnel Ram

The Pro-Filer Spreadport HITMAN Series of intake manifolds have transformed the market forever. The HITMAN Series features a Tunnel Ram with your choice of dual or single carb top plate and the ULTIMATE Single Plane.

Each manifold is designed to take your power curve to higher levels without costly hand porting. They are truly revolutionary! Our tunnel ram design is lighter weight than most fabricated units and the solid cast design helps to reduce resonance, which effects high RPM horsepower.

The cast, pre-ported runners have been designed to eliminate airflow restriction and produce more power. And the dimensional consistency is far better than fabrication.

Pro-Filer Hitman Tunnel Ram
for Big Block Chevy Spread Port

Available in 9.8 & 10.2 Deck Heights with either a single, dual carb or no top plate.

Series 187
Price (lower casting only):

Top Plate
Deck Height

Hitman Tunnel Ram Intake Specifications

Material: Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot)
Deck Height: 9.8" or 10.2"
Overall Height: Dual Carb - 9.5", Single Carb Top - 11.5"(For 9.8" Deck Model)
Runner Location: Fits Majority of BBC Spreadport Cylinder heads regardless of valve angle
Port Configuration: Oval Port
Engine Size Recommendation: 565 + cid

Which one is better? Tunnel Ram or Single Plane?

It depends on where you want your power at. We recently compared our Pro-Filer PN 187 Tunnel Ram (Single carb) VS our new HITMAN PN 208 Single Plane intake and found the following differences in torque and horsepower;

View Dyno Torque Curve (opens in new window)
View Dyno Horsepower Curve (opens in new window)

Pro-Filer Performance Products
PO Box 217
New Carlisle, OH 45344
United States of America
Phone: 937-846-1333
Proudly Made in America