Heat riser

[Bill M.]

Has anyone ever lubricated their heat riser ? Does it help ?

[Patrick H.]

Re: Heat riser

https://a.co/d/1tsT6gB

This is the current GM lubricant.
It worked well for me, but I consider it a way to get through Ops or a PV, not a permanent fix.

[David M.]

Re: Heat riser

Agreed lube isn't permanent but may work for short term. That duration depends how far gone the bushings are. The exhaust pulses will simply blow out the lube. Copper anti seize or graphite may last a little longer. Both are a band-aid.

To function 100% for PV it needs to be re-bushed with a new shaft and spring. Not a hard job for an experienced wrench. The exhaust manifold needs to come off. Are the parts available??

It can be fully eliminated or made inactive yet visually intact if PV isn't on your list.

Fully blocking off the intake crossover and eliminating the riser valve in the exhaust manifold is a good performance enhancement.

The performance advantages are a cooler intake, cooler carb, and the paint wont ever burn off the intake.
It will be somewhat cold blooded but the choke can be adjusted to compensate.

[Larry E.]

Re: Heat riser

I would just bite the bullet and take the "flapper" off with your dremel. See below.
No matter what you do to try to fix it will get stuck sooner or later and nothing
good happens when this happens. Been There Done That. Larry

[Bill M.]

Re: Heat riser

Thanks all I am in a bit of a disagreement with someone on how the lube works. I believed ( as stated) that the lube does not last. I have removed the gate from many of the valves. PV does not concern me. Thanks Happy Thanksgiving.

[Michael J.]

Re: Heat riser

I just wire mine open for driving, and when I go to flight judging, I take the wire off.

[Joe R.]

Re: Heat riser

Why don't you just buy a new one? Volunteer Vette sells both 2inch and 2.5 Inch correct figuration heat risers!

JR

[Harry S.]

Re: Heat riser

How about just a spacer!

https://www.topflightautomotive.com/products/auto-accessories-of-america-1962-1974-chevrolet-corvette-exhaust-heat-valve-spacer-2-inch-w-o-fuel-injection/

[Patrick H.]

Re: Heat riser

Why don't you just buy a new one? Volunteer Vette sells both 2inch and 2.5 Inch correct figuration heat risers!

JR

In my experience, the current ones available always stick or have issues.
I use NOS originals whenever I can, and they work much better.

YMMV, as they say.

[Bill M.]

Re: Heat riser

Thanks all. I drive my cars to the max so if I go for judging I will instal a functional riser. For now I will heave the gutted units in. Only takes an hour including getting lift set up. 🔧🛠️

[Tim G.]

Re: Heat riser

I wire all of mine open, I usually forget to remove it for judging. It is not needed in Texas.