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FE FORD 352-428 Max Output I, Drop In Valve Spring Kit, Hyd Flat Tappet Engines

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Product Description

 Fits most OE FE Ford iron castings

MAX OUTPUT Drop in Valve Spring Kit, for 3/8" Valves

Application: FE FORD, 352, 360, 390, 410, 427 & 428 With Hydraulic Flat Tappet and select mechanical flat tappet cams.

Our Drop in FE Ford valve spring kits are intended for heads w/ a stepped spring base which just so happens to be the most common version out there.

Alex's Parts offers several drop in kits for FE Ford; three or four cylindrical kits and a few beehive versions.

This version here is for the "Max Output I" variation.

This Max Output I valve spring kit is normally used on cams with up to around 236 degrees duration at .050" and up to .570" lift.

If you need springs for a bigger cam, take a look at our Max Output II versions including our beehive kits.


      Spring Specifications:

  • 1.480" Outside Diameter
  • Spring Type- Single w/ Damper
  • 110 Lbs @ *1.820" Valve Closed Installed Height
  • 281 Lbs @ .500" lift
  • 310 Lbs @ .570"
  • Max lift- .570" when set to 110 Lbs seat pressure




     Kit includes:

  • Sixteen 7 Degree Chrome Moly Steel Retainers for 3/8" Stem Valves
  • 32 Hardened 3/8" 7 Degree Valve Locks
  • 16 Drop in Max Output Valve Springs
  • Installed Height Specification Card




  • FE FORD 352-428 w/ 3/8" Stem Valves and a stepped spring base register


Requirements- As with any performance aftermarket valve spring kit, spring installed heights must be measured and shimmed as necessary. When running high lifts, setting up the installed heights accurately is a must. 

*Use the installed height spec card included with your kit.




Alex's Parts- The smart choice in valve train parts~

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