The Stovebolt Site Forums The Shop Area Engine Shop Heat Riser Valve

Great thread. Now the $64K question - where can I get a replacement spring? (other than the bone yard).

Jim Carter has 'em. Brand spankin' new!

http://www.classicparts.com/1937-65-Heat-Riser-Spring-6cyl/productinfo/89%2D425/#.UNyBeHy9KSM

http://www.chevsofthe40s.com/detail/6190/Chevrolet_Heat_Riser_Spring_Thermostat.html

http://www.chevsofthe40s.com/detail..._Shaft_Oversize_Requires_Reaming_Of.html

http://www.chevsofthe40s.com/detail/6189/Chevrolet_Heat_Riser_Spring_AntiRattle.html

http://vcca.org/forum/ubbthreads.php/topics/25607/Re_manifold_heat_valve#Post25607

http://www.oldchevytrucks.com/cart/product.asp?prodid=ME188&i=%7Criser%7C%7C%7C%7C

Yep,,,that orta cover it Tim.

Denny G

Thanks! (he said sheepishly)

Tread revival… anyway, I am in the process of restoring my exhaust manifold. My heat riser shaft was almost worn all the way through. I cut it apart to get it out of the manifold and will make another shaft…that's the easy part. What I am not sure how to handle is the enlarged holes in the manifold. It seems there may have been bushings originally, but not sure. Anyone have any suggestions on what to about the holes in the manifold: bushings, etc.

chevs of the 40's offers an oversized shaft
...click...

Thanks, I found that eventually. Sorry about the blank post...happens when I use the Ipad (and I forget). Unfortunately, the Chevy of the 40s website does not say how much oversized and so I cannot ensure that the holes in the exhaust manifold are not still worn too large. May just give it a try or look for brass bushing that I can insert and drill out to a shaft size I make on my own.

Originally, did the manifolds have bushings installed?

I'll bet if you phone them and ask, they'll tell you how big the shaft is.

Somebody decided to remove my heat riser valve shaft, flap, spring and weight. They plugged the holes with a bolt, washer, and nut on both sides.

I would like to put my 216 back the way it came from the factory...

It looks like I can get a new shaft and spring.

Does anybody have a flap and weight I could buy?

Thanks!

I make those parts out of stainless steel, and use a stainless disc with the hole for the shaft a little off-center for a counterweight. With a little creative tinkrting with an angle grinder, you can shape the weight for the proper opening force on the flap as the spring heats up. The stainless flap, shaft, and counterweight will still be in good shape when your grandkids inherit the truck in a few decades.
Jerry

Hi Jerry, would you please make me a disk and a weight? I would gladly pay you for your effort! I think I would be more inclined to do it if I had a sample of the shape and thickness.
I am missing all of the parts!

I could even draw it in Solidworks cad and have it made by machine!

Like I used to tell my students when I taught auto mechanics- - - - - -"It takes a smart student to get the instructor to do all the work"! I throw out ideas on this forum, and even assist with some of the technical stuff, but it's up to younger guys to jump into action and get the work done. After 60-something years in the automotive business, I've become the crochety old geezer sitting by the stove and making snide remarks while the young sprouts get busy! Cardboard for pattern material, an X-Acto knife and a pair of scissors, and an angle grinder and a good set of files work as well, or sometimes better than CNC equipment!
LOL!
Jerry

I found one on eBay. As soon as it arrives, I will use it as a sample and create a brand new one out of stainless!