Heat riser block off epoxy & plugs together???

Old March 5th, 2018, 12:07 AM
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Heat riser block off epoxy & plugs together???

https://www.summitracing.com/int/par...2733/overview/

These plugs ground to fit well not force fitted, then set in with epoxy.
The thought behind this is that a smaller amount of epoxy would be subjeted
to the extreme exhaust temperature.
Some of the hi heat epoxies are not designed to span a large distance.
Again this method is for those that have machined heads not bare core heads.
Another thought would be to tack weld them into place but this method is risky as you can cause warpage
even with a tack.

Last edited by Bernhard; March 5th, 2018 at 12:12 AM.
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Old March 5th, 2018, 08:46 AM
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Here are two old threads about blocking the exhaust crossover with epoxy:

https://classicoldsmobile.com/forums...d-product.html

https://classicoldsmobile.com/forums...echniques.html

I don't think you will be able to use epoxy for this application. If you don't want to melt aluminum to fil the exhaust crossover in the heads then just cut a soda/beer can to support the intake manifold gasket at the exhaust crossover. This will block the hot exhaust. Many members have done that succesfully.
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Old March 5th, 2018, 07:07 PM
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I was thinking about fitting the plug then drilling a 3/8 hole on each side of the plug. Drill 50% of the plug, and 50% of the head on a drill press. Then tap the hole and then get a 3/8 plug with an allen. Then torque down the plug so it fits snug.

Shouldn't go anywhere at that point?
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Old March 5th, 2018, 07:20 PM
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Originally Posted by Olds64 View Post
Here are two old threads about blocking the exhaust crossover with epoxy:

https://classicoldsmobile.com/forums...d-product.html

https://classicoldsmobile.com/forums...echniques.html

I don't think you will be able to use epoxy for this application. If you don't want to melt aluminum to fil the exhaust crossover in the heads then just cut a soda/beer can to support the intake manifold gasket at the exhaust crossover. This will block the hot exhaust. Many members have done that succesfully.
I have used the steel block off plates with very good results that Dave Smith made. I was just looking for even better method for heads that have already been machined.
Thanks for the links and feedback
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Old March 5th, 2018, 07:21 PM
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Originally Posted by VinMichael View Post
I was thinking about fitting the plug then drilling a 3/8 hole on each side of the plug. Drill 50% of the plug, and 50% of the head on a drill press. Then tap the hole and then get a 3/8 plug with an allen. Then torque down the plug so it fits snug.

Shouldn't go anywhere at that point?

I'm having a hard time visualizing this method.
Thanks for the reply.
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Old September 20th, 2018, 05:31 PM
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Dont use epoxy it will melt all over the top of your pistons and glob up on your exhaust valves and hang them open and you will crash it into your piston
on top of much more damage !
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Old September 23rd, 2018, 11:19 AM
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Melt a piston down and fill it in the right way.
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