Flo-Tek 203505 Small Block Ford Aluminum Cylinder Head

Info

Application

• Recommended Spark Plug:  AGSF-32C
• Valve Spring Type:  Single w/ Damper
• Valve Spring Application:  Hydraulic & Solid Flat Tappet 
• Valve Spring Diameter:  1.465" O.D.
• Valve Spring Seat Pressure:  115 lbs.
• Valve Spring Rate:  240 lbs/in.
• Max lift: 0.550"
• Intake Valve:  1.94"
• Exhaust Valve:  1.54"
• Valve Type:  Stainless, Swirl-Polished
• Air Flow Data:
  • Intake
    • 223 CFM @ .500"
    • 248 CFM @ .600"
  •  Exhaust
    • 161 CFM @ .500"
    • 191 CFM @ .600"

Notes

• These Flo-tek aluminum heads are the answer to the performance enthusiast and work on the small block Fords including the later EFI series when used in conjunction with an aftermarket intake, carb, and camshaft. Aluminum heads allow for a higher compression ratio than cast heads without creating pre-ignition problems. Check your piston usage with the 58cc combustion chamber for accurate ratio computation.
• If using the heads on a 289 or 302 the upper row is 80 pounds net and the lower is 70 pounds. Torqued in stock sequence and increments. If using on the 351 with the larger bolts it is 100 pounds net torque in same sequence and increments as stock.
• The head uses 3/8 rocker studs 915-99156 and requires the use of adjustable rocker arms like our part number: 915-11772. You will need to check your push rod length to determine the correct length before ordering pushrods.  
• Depending on the how much extra lift you are going to go with, you may also need different valve spring retainers that allow for more valve spring installed height
• 289 & 302 engines with 7/16” head bolts use 1012543708.  351W engine with ½” head bolts use 590HBK35100.

• These Flo-Tek aluminum heads for the small block Ford are specified to take plug number AGSF-32C

• Valve springs are suitable for most hydraulic flat tappet and mild street hydraulic roller camshafts

Specs

• Recommended Spark Plug:  AGSF-32C
• Valve Spring Type:  Single w/ Damper
• Valve Spring Application:  Hydraulic & Solid Flat Tappet 
• Valve Spring Diameter:  1.465" O.D.
• Valve Spring Seat Pressure:  130 lbs.
• Valve Spring Rate:  280 lbs/in.
• Intake Valve:  1.94"
• Exhaust Valve:  1.54"
• Valve Type:  Stainless, Swirl-Polished
• Air Flow Data:
  • Intake
    • 223 CFM @ .500"
    • 248 CFM @ .600"
  •  Exhaust
    • 161 CFM @ .500"
    • 191 CFM @ .600"

Important Messages

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