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Product Summary

  • This head is engraved with IMCA logo and serial numbered by Engine Quest to make it approved for use in IMCA classes that allow the CH350I cylinder head
  • 76 cc combustions chamber and 176 to 178 cc intake runners deliver consistent performance
  • COMP version (Complete assembled) includes stainless steel valves, performance valve springs, retainers, keepers, and 3/8" screw in studs
  • SM version (Sport Mod) also has upgraded Isky valve springs part number 450235D and lightweight Ferrea tool steel retainers
  • SC version (Stock Car) also has upgraded Isky valve springs part number 450235D, lightweight Ferrea tool steel retainers, and max flat milled w/ intake surface corrected

Key Specs

Cylinder Head Style
Material TypeCast Iron
FinishNatural
Combustion Chamber Volume76cc
Intake Runner Volume176/178cc

Need To Know

This Product Will Ship Free

Shipping Policies & FAQs

Quick and Easy Returns

Return Policy

Details

This head is engraved and serial numbered by Engine Quest for IMCAs Sport Mods, Stock Cars, and Hobby Stocks. Now approved for WISSOTA Midwest Mods and Street Stocks.

Assembled heads will include the following:

  • 3/8" screw in studs # 915-99156
  • 76 cc combustion chamber
  • 176-178 cc intake runners
  • Straight plug
  • 1.94/1.50 intake/exhaust valves #910-14140-1 & 910-14145-1
  • Available bare or assembled and blue printed
  • Heavy duty valves
  • (COMP) version includes Retainers and locks # 915-39741 & 577-555
  • (COMP) version includes 1.25" high-performance valve springs # 180-671515
  • (SM-Sport Mod) version includes Isky Springs # 450-235D, 7 deg locks and Ferrea tool steel retainers
  • (SC-Stock Car) version includes Isky Springs # 450-235D, 7 deg locks and Ferrea tool steel retainers, Max Flat Milled w/ intake surface corrected
  • Three angle valve job

Item Details

Straight Plug
1.94/1.50 Intake Valves

IMCA Approved.

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.

Specifications

KEY SPECS
MFG. Part #
BrandSpeedway Motors
Cylinder Head Style
Material TypeCast Iron
FinishNatural
Combustion Chamber Volume76cc
Intake Runner Volume176/178cc
GENERAL
Combustion Chamber Volume Range70cc - 79cc
Intake Runner Volume Range170cc - 179cc
Spark Plug StyleStraight
Intake Port ShapeRectangle
Exhaust Port ShapeSquare
Intake Valve Diameter1.940"
Intake Valves IncludedYes
Exhaust Valve Diameter1.500"
Exhaust Valves IncludedYes
Valve Spring IncludedYes
Valve Seat Machine Style3-angle
Valve Seats MachinedYes
Locks IncludedYes
Lock Style7 Degree
Retainers IncludedYes
Retainer MaterialSteel
Stud Diameter0.380"
Notes-Manufactures recommends using R5673-8 NGK or equivalent spark plugs. (373-133 or 373-134 Autolite). -Item expected to be on back order until March 2020
Sold in QuantityEach