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Review on πŸ”’ Efficiently Sealed: Fel-Pro 35610-1 Thermostat Gasket Simplifies Temperature Regulation by Brian Wolf

Revainrating 5 out of 5

7.3 Lower Powerstroke Water Seal

99 F250 Super Duty 7.3. I bought it locally in place of the Ford F81Z-8255-AA (aka RG-602) part. For my application, this is the elbow below the thermostat (the elbow where the large lower radiator hose connects). Fel-Pro 35702 is the gasket for the thermostat itself. Due to the slightly rough finish due to corrosion I chose to use a thin coat of ultra gray RTV to enhance this seal. It fits and works perfectly.

Pros
  • Meets or exceeds all OE specifications
Cons
  • Guard