# Manifolds hot

**URL:** <https://community.cartalk.com/t/manifolds-hot/138075>\
**Category:** Maintenance/Repairs\
**Created:** [April 7, 2019, 1:02pm UTC](https://community.cartalk.com/t/manifolds-hot/138075 "2019-04-07T13:02:18Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Kirkhammett8\_150494](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/kirkhammett8_150494/32/15524_2.png) [@Kirkhammett8\_150494](https://community.cartalk.com/u/Kirkhammett8_150494)\
**Post date:** [April 7, 2019, 1:02pm UTC](https://community.cartalk.com/t/manifolds-hot/138075/1 "2019-04-07T13:02:18Z")

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I got a 318 la in a d100. Replaced the intake gaskets. valve cover gaskets. And pushrods. Put everything back together. Fires up. Within 30 seconds driverside manifold starts to smoke. I shut it off. Look at it and its hot like its been running for an hour at wot. Heads cold. And so is yhe other side. I dont got no cats on it. So nothing could be clogged up. I cant find any help anywhere online about similar issues. Ive talked to several people about it. Master techs and all. Im stuck.

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**Author:** ![Mustangman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mustangman/32/44130_2.png) [@Mustangman](https://community.cartalk.com/u/Mustangman)\
**Post date:** [April 7, 2019, 1:18pm UTC](https://community.cartalk.com/t/manifolds-hot/138075/2 "2019-04-07T13:18:37Z")

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I assume by 318 in a d100 you mean a 318 Dodge V8…

Improper timing can heat up an exhaust manifold just idling. If only one manifold is hot, I would suspect the exhaust valves are not closing all the way. Run a quick compression test on that side. One or more cylinders might have the wrong length pushrod in it, or a lifter is jammed.

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**Author:** ![Rod-Knox](https://avatars.discourse-cdn.com/v4/letter/r/a183cd/32.png) [@Rod-Knox](https://community.cartalk.com/u/Rod-Knox)\
**Post date:** [April 7, 2019, 5:10pm UTC](https://community.cartalk.com/t/manifolds-hot/138075/3 "2019-04-07T17:10:15Z")

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Is the intake manifold getting hot under the carburetor? And is there a heat riser on the driver side exhaust manifold?

And BTW, why did you replace the push rods?

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [April 8, 2019, 2:17am UTC](https://community.cartalk.com/t/manifolds-hot/138075/4 "2019-04-08T02:17:38Z")

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If it is your exhaust manifold , it sounds like you have a stuck heat riser.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [April 8, 2019, 2:33am UTC](https://community.cartalk.com/t/manifolds-hot/138075/5 "2019-04-08T02:33:24Z")

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If there is oil on the exhaust manifold it is going to smoke for a few minutes until it burns off.

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**Author:** ![pleasedodgevan2](https://avatars.discourse-cdn.com/v4/letter/p/ad7895/32.png) [@pleasedodgevan2](https://community.cartalk.com/u/pleasedodgevan2)\
**Post date:** [April 8, 2019, 4:39am UTC](https://community.cartalk.com/t/manifolds-hot/138075/6 "2019-04-08T04:39:58Z")

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It’s probably OK. When the heat riser opens the driver side may cool a little. Use your infrared thermometer to find out.