Product Summary

Universal Fit, Roadster Header Tube Type, Steel, Raw

  • Features 18 gauge mild steel
  • Fabrication required

Key Specs

Header Tube TypeRoadster
Exhaust Port ShapeRectangle
Flange StyleStandard
Primary Tube Diameter1-7/8"
Material TypeSteel

Need To Know

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Speedway Motors 41865630 Details

Save money by welding and assembling your own headers! These small block Chevy header kits will work for many racing and rodding applications. It includes everything you need to assemble a pair of high-quality headers: eight mandrel-bent primary tubes, two pre-formed collectors, two extra-thick standard-port flanges, two gaskets, and 12 header bolts.

Designed for the seasoned, hands-on enthusiast, weld up headers will require some cutting, fitting and welding.

  • Thick 1/4" steel flanges
  • Mandrel-bent 18-gauge mild steel tubing
  • Pre-formed 4-into-1 collectors
  • 8" length from longest to tube flange to bend
  • 5" length from shortest tube flange to the bend

Item Details

1-7/8" Square Port, 3-1/2" Collector



TS = 1 7/8
A  = 5" TO 10"
B  = 13.5"
C  = 26 TO 36"

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

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, or 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 41865630 Specifications

MFG. Part #41865630
BrandSpeedway Motors
Header Tube TypeRoadster
Exhaust Port ShapeRectangle
Flange StyleStandard
Primary Tube Diameter1-7/8"
Material TypeSteel
Collector Diameter3-1/2 Inch
Collector Attachment TypeSlip fit
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Reducers IncludedNo
Collector Length8.5"
Flange Thickness.25"
Port Height1.92"
Port Width1.53"
Sold in QuantityKit