Product Summary

LM4, LM7, LQ4, LQ9, LR4, LS1, LS2, LS6, Raw, Steel

  • Feature 1 3/4" primary tubes and 3" collectors
  • Oxygen sensor bung welded to collectors

Key Specs

Header Tube TypeMid-Length
Flange StyleStandard
Primary Tube Diameter1-3/4"
Material TypeSteel

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Speedway Motors 930C46 Details

These headers allow you to install the popular LS1 engine in your 1955-1957 Chevy car. They feature 1-3/4" primary tubes and 3" collectors. Oxygen sensor bung welded to collectors.

Note: These headers will not clear motor mount part number 720-4501 and 916-55571.


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 930C46 Specifications

MFG. Part #930C46
BrandSpeedway Motors
Header Tube TypeMid-Length
Flange StyleStandard
Primary Tube Diameter1-3/4"
Material TypeSteel
Exhaust Port ShapeRound
Collector Diameter3 Inch
Hardware IncludedYes
Gasket(s) IncludedYes
Collector Attachment Type3-bolt flange
Collector Reducers IncludedYes
Collector Reducer Exit Diameter2.5"
Collector Length7"
Flange Thickness.31"
Port Height1.73"
Port Width1.73"
Drivers Side Dimension A8.25"
Drivers Side Dimension B15.5"
Drivers Side Dimension C23.75"
Passenger Side Dimension A7.95"
Passenger Side Dimension B15.05"
Passenger Side Dimension C24.13"
Sold in QuantityPair
NotesIncludes a pair of reducers (3.00" to 2.50")