Product Summary

Universal Fit, Block Hugger Header Tube Type, Steel

  • Extra mid-to-upper rpm power
  • 1 5/8" primary and 2 1/2" collectors
  • Universal application

Key Specs

Header Tube TypeBlock Hugger
Exhaust Port ShapeOval
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel

Need To Know

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Speedway Motors 9300104 Details

If you are using 1992-and-later LT4 style D-port heads in your street rod, these tight-fit headers are for you. The tight-fit design fits in a wide variety of applications, and the shorty headers have built-in OEM-style donut seals on the collectors so no gaskets or collector reducers are needed.

  • Compact design
  • OEM-style exhaust pipe connection
  • 3/8” thick flanges w/ oval 1.29" x 1.67" port configuration
  • Header bolts and exhaust gaskets are included
  • Collector reducers are not included but are offered below
  • May require modifications to accommodate knock sensors in some applications


  • 1992 and later LT-4 engines
  • Compact design will fit a wide variety of early street rods
  • Will not fit 1955-1957 Chevys, Camaros, Chevelles or other modern cars with crossmembers under the two center exhaust ports


Guides & Documents

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 9300104 Specifications

MFG. Part #9300104
BrandSpeedway Motors
Header Tube TypeBlock Hugger
Exhaust Port ShapeOval
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel
Collector Diameter2-1/2 Inch
Collector Attachment TypeBall and socket
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedNo
Flange Thickness.38"
Port Height1.67"
Port Width1.29"
Header Dimension A4.25"
Header Dimension B10.50"
Header Dimension C18.38"
Sold in QuantityPair