Product Summary

Universal Fit, Block Hugger Header Tube Type, Steel

  • Compact design. 3/8" thick flanges
  • Fits ZZ4 crate engines
  • Header bolts and exhaust gaskets are included. Collector reducers are not included
  • Ball flange pipe connection
  • Armor Hot Coat® is a Speedway Motors custom ceramic heat proof coating that will keep the finish of these headers looking great for years to come

Key Specs

Header Tube TypeBlock Hugger
FinishCeramic Coated
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel

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Speedway Motors 9300104H Details

If you are using ’92-and-later LT4 style D-port heads in your street rod, these shorty headers are for you. The tight-fit headers design fits in a wide variety of applications, and the block hugger headers have built-in OEM-style donut seals on the collectors so no gaskets or collector reducers are needed. These block hugger headers are ceramic coated headers.

  • Compact design
  • OEM-style exhaust pipe connection
  • 3/8” thick flanges w/ oval 1.29" x 1.67" port configuration
  • 16-gauge tubing
  • Header bolts and exhaust gaskets are included
  • Collector reducers are not included but offered below
  • May require modification 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 exhaustt ports



AHC coated headers will burn and be damaged at exhaust temperatures above 1300 degrees. An excessively lean fuel mixture can generate exhaust temperatures over 1700-1900 degrees. If the coating is burned (which will look like a dull gray) due to a lean condition, it is not warrantied, but the headers can be recoated.

Not legal for sale or use in California on pollution controlled motor vehicles.

Guides & Documents

CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. 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 9300104H Specifications

MFG. Part #9300104H
BrandSpeedway Motors
Header Tube TypeBlock Hugger
FinishCeramic Coated
Flange StyleStandard
Primary Tube Diameter1-5/8"
Material TypeSteel
Exhaust Port ShapeOval
Collector Diameter2-1/2 Inch
Hardware IncludedYes
Gasket(s) IncludedYes
Flange Thickness.38"
Port Height1.67"
Port Width1.29"
Header Dimension A4.25"
Header Dimension B10.50"
Header Dimension C18.38"
Sold in QuantityPair
NotesFits angle plug style heads.