Product Summary

Chevy Small Block V8, Assembled Cylinder Head Style

  • Intake port volume measures 180cc
  • Accepts both perimeter and center bolt valve covers
  • Valve guides are compatible with all common valve materials and fuels
  • The 64cc fast-burn combustion chambers are designed to deliver big power
  • Features a standard port location for use with most intake and exhaust manifolds

Key Specs

Cylinder Head StyleAssembled
Material TypeAluminum
Combustion Chamber Volume64cc
Intake Runner Volume180cc

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 Breathe new life into your small block Chevy with a set of FloTek aluminum cylinder heads from Speedway Motors. If you're looking for a budget-conscious, yet proven, cylinder head for bolt-on performance gains, check out these completely assembled cylinder heads from FloTek. Features like fast-burn combustion chambers, high-velocity ports, large diameter valve springs, and rugged construction make these heads the obvious performance upgrade for small block engines.

FloTek cylinder heads are designed for optimal airflow and performance on SBC engines with a 4.0" bore. Large 180cc intake runners, with an improved short-side radius, provide a rush of air into the cylinders, increasing torque. The key ingredient for big power, however, is the 64cc fast-burn combustion chambers. Air flows in and out of these chambers via a 3-angle valve job. A 62cc exhaust runner gets the spent gasses out. All told, these heads will flow 232 CFM @ .500" lift on the intake and 173 CFM @ .500" lift on the exhaust.

FloTek aluminum cylinder heads arrive packed full of standout features at an incredible value. At 20 lbs. apiece, the state-of-the-art aluminum alloy casting is a great base for any mild SBC build. FloTek cylinder heads are built with bronze valve guides, high nickel valve seats, milled and drilled ends for accessory bracket mounting, and are available in straight or angle spark plug configurations. Assembled heads add stainless valves, 1.46" diameter springs, chromoly retainers, Viton seals, pushrod guide plates, and 3/8" screw-in rocker studs - for a complete bolt-on performance package!

Maybe you are a bit more involved in your engine build - no problem! Pick up a set of bare FloTek heads, also available with straight or angled plugs, to build out with the valves, springs, and hardware of your choice.


  • Heads are sold EACH
  • Standard port location for use with most intake and exhaust manifolds
  • 180cc intake port volume
  • 62cc exhaust port volume
  • 64cc fast-burn combustion chambers deliver big power
  • 2.02” intake/1.60” exhaust valves
  • 3-angle valve job enhances flow at low-to-mid lifts
  • Swirl polished & undercut stainless steel valves
  • Intake flows 232 CFM @ .500” lift
  • Exhaust flows 173 CFM @ .500” lift
  • Accepts both perimeter and center bolt valve covers
  • Single 1.46” diameter valve springs w/ inner damper
  • Suitable for flat tappet camshafts up to .550” lift
  • 7 degree lightweight chromoly retainers and keepers
  • Hardened steel spring cups for durability
  • High nickel powdered metal valve seats provide optimum heat transfer and wear characteristics
  • Manganese bronze valve guides reduce friction
  • Valve guides are compatible with all common valve materials and fuels
  • Viton positive valve seals
  • 2-piece hardened steel pushrod guide plates for use with hardened pushrods
  • 3/8” chromoly screw-in rocker arm studs included
  • Blocked exhaust heat riser manifold crossover port
  • 3/8” NPT coolant temperature probe port
  • Designed for 4" bore small block Chevy engines (302/327/350/383)


These fully assembled heads are ready to run and are a great match to flat tappet camshafts. They're compatible with solid (mechanical) flat tappet or hydraulic flat tappet cams with up to .550” lift. The valve springs (single with flat wire inner damper) have a seat pressure of 120 lbs. Valves are +.100" long and must be used in conjunction with aftermarket aluminum roller rocker arms to clear valve springs used which are 1.46" diameter. The valve springs have 120 lbs. @ 1.800" installed height and 290 lbs. of open pressure at 1.20” (coil bind is at 1.160”).

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.


MFG. Part #102505
Cylinder Head StyleAssembled
Material TypeAluminum
Combustion Chamber Volume64cc
Intake Runner Volume180cc
Exhaust Runner Volume62cc
Combustion Chamber Volume Range60cc - 69cc
Intake Runner Volume Range180cc - 189cc
Exhaust Runner Volume Range60cc - 69cc
Spark Plug StyleStraight
Intake Port ShapeRectangle
Exhaust Port ShapeSquare
Intake Valve Diameter2.02"
Exhaust Valve Diameter1.6"
Spring Diameter1.45"
Stud Diameter0.38"
NotesCenter to centers for passenger side are 4.80" and 5.45". Driver's side is 1.98" and 3.63"
Sold in QuantityEach