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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Feb 2016 Posts: 1,990 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,990 | I agree with HRL, the thermostat housing is a soft alloy, they deform kinda' easy with heat, age, torque. Remove the housing and file the surface flat. If it is an aftermarket housing with an O-ring, I had poor luck with that style. Make sure the bolts are not too long, are they bottoming before the housing is snug? Also, look at the heater hose connection if there is one in the intake manifold, should be close to the t-stat.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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