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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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For helping keep this great
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2006 Posts: 3 New Guy | | New Guy Joined: Aug 2006 Posts: 3 | Looking but cannot find. Mine rusted through. Any suggestions or links? | | | | | Joined: Feb 2004 Posts: 29,826 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,826 | Do you mean the bimetal spring on the heat riser valve? I have substituted a coil from an automatic choke at times, but the performance isn't great. Be sure the heat riser shaft is able to turn freely, and the flapper valve isn't damaged or burned away. The spring should be wound in a direction that routes exhaust heat toward the intake when the engine is cold, and directs exhaust gas away from the intake after warm-up.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jun 2005 Posts: 388 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 388 | Obsolete Chevy Parts Search for EXHAUST MANIFOLD THERMOSTAT SPRING 6 cyl Part No. 838573. Or, call them at (229) 686-5812. Hoyt | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | |
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