Heat Riser

[42D22]

Going to try to get my heat riser operational again. I have a new spring and can fabricate a new bump stop. I am missing the spring spacer, part #644876. Would anyone happen to have the dimensions for this part so I can make something else work. TIA

[Doug&Deb]

If need be a heat riser kit is available from Andy Bernbaums. 

[desoto1939]

There are Heat riser kits, But be careful because they were made to fit either the 23 inch block and a different kit to fit the 25 inch block.

 

Sometimes you see the Ply/Dodge Heat riser kit on Ebay but the 25 inch block for the Chry/Desoto are harder to find.

 

 

 

Rich Hartung

Desoto1939@aol.com

[42D22]

Good to know, thankyou. I will be putting a whole new kit in when I put the new motor together over the summer. Swapping it in next winter. Just getting the old one working for now. I see the rebuild kits at AB, but they are unfortunately only for the 23" block. 

[42D22]

I got the heat riser to work. used a 3/32' thick washer for spacer, fabricated a bump stop from old stuff kicking around the shop, and installed new spring (L442 from AB). Wrapped counterclockwise 335*. Seems very tight even when hot. Is it supposed to be tight or kind of floppy when hot?

[Doug&Deb]

Should rotate freely when you blip the throttle. If it’s too tight you’ll experience vapor lock (don’t ask how I know). 

[D35 Torpedo]

I sure dig your 48 Royal. Good luck with the riser. I blocked mine off.

[42D22]

So... I took the spring off and reinstalled half a turn less than the 335 degrees specified in manuals. 167.5 degrees. Flops down to 3 o'clock when I put some heat to it and then slowly back to 12 when cools down. And opens with a blip of the throttle, didn't move at all before. Aftermarket springs are too tight I guess.