Product Summary

Universal Fit, Cast Iron, Natural, Gasket(s) Included

  • 2 1/2" outlets
  • Has provision to accept original generator and water tank type brackets on passenger side
  • Driver side includes OEM boss for expansion tank

Key Specs

MFG. Part #9300328
BrandSpeedway Motors
Material TypeCast Iron
Collector Diameter2-1/2"

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Speedway Motors 9300328 Details

These "rams horn" cast iron exhaust manifolds were patterned off the 1962-63 327 Corvette but are not OEM remanufactured manifolds (no casting numbers). They feature the big 2-1/2" diameter outlets and have provisions to accept original alternator type brackets. They are the perfect addition to a retro 327 style build: 365hp L76, 375hp L84, or 350hp L79 (all came with 2-1/2" outlets).

These Chevy ram horn manifolds are copies of the original1962-63 Corvette manifolds and can be used on almost any small block engine up to 1999. The cast in brackets are for the water tank on the drivers side and generator bracket on the passenger side. These can be cut off and smoothed per customers preference. These are a square port configuration with 1-5/16” top to bottom and also side to side. Compare to your head port size for compatibility.

  • Modeled after 1962-63 327 Corvette manifolds
  • Works on most small blocks up to 1999
  • 2-1/2" diameter outlets
  • 1-5/16" square ports
  • Use with 3 bolt header reducer/collector
  • Includes (1) left and (1) right side manifold
  • Gaskets included (manifold to cylinder head and outlet collector gaskets)
  • Manifold to cylinder head bolts/hardware and collector stud/hardware are included



  • Header Dimension A: 4.00"  Manifold Dimensions (GIF)
  • Overall Length: 20.25"
  • Overall Height: 6.50"
  • Center to Center: 3.50"
  • Collector Diameter: 2.50"
  • Notes: Center of head mounting bolt to bottom of collector flange is 4-3/16", to highest point of manifold is 2-3/4"


  • Header Dimension A: 4.0313"  Manifold Dimensions (GIF)
  • Overall Length: 21.00"
  • Center to Center: 4.50"
  • Collector Diameter: 2.50"
  • Inlet Size: 1.3125"
  • Notes: Distance from head mounting bolt to collector flange bottom is 4.1875". Center of head mount to highest point is 2.75".

CARB Warning

For use on pre-1966 vehicles only

Emissions warning: this part only legal for sale or use in California if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. ++any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering there are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Speedway Motors 9300328 Specifications

MFG. Part #9300328
BrandSpeedway Motors
Material TypeCast Iron
Collector Diameter2-1/2"
Gasket(s) IncludedYes
Hardware IncludedYes
Sold in QuantityPair