See our full spacer install video on our Youtube Channel HERE


A common issue with some Gen III Hemi swaps is establishing a tidy installation of factory coolant temperature sending units and electric fan controller switches. Our new billet thermostat spacer is a bolt in solution that provides two parallel sending unit ports, at an optimal angle for hiding wires in the existing fuel injector wire loom. No more ugly hose splices or unsightly wires draped over the timing cover to use the factory coolant bleed port!



  • Anodized Billet Aluminum Spacer (Choice of Black or Clear/Natural)
  • Viton O-ring seal (engine side)
  • Stainless steel bolts


*Note 1: Truck applications require the use of a low clearance head bolt in the timing cover, cars do not require this bolt. Please indicate which hemi engine you have.

*Note 2: Sending unit ports are 1/8NPT

Dual Stealth Thermostat Spacer

SKU: DIYH-4003
Engine Type
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