The Stovebolt Page Forums Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Helping out ...


EVENTS

Check in for status!

Jump over to the Events Forum, to post events -- new ones or the ones we have been enjoying for some time.
Look to see what's been cancelled or postponed.

Encourage one another!

Stovebolt Site Search
 
Old Truck Calendars
Months of truck photos!
Nothing like an old truck calendar

Stovebolt Calendars

Check for details!


Who's Online Now
0 members (), 137 guests, and 3 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums50
Topics121,069
Posts970,530
Members43,832
Most Online1,229
Jan 21st, 2020
Image Posting Policy
Previous Thread
Next Thread
Print Thread
Noticing hot headers after first start of old engine.
#1371694 Sat Aug 01 2020 09:58 PM
Joined: Jan 2020
Posts: 160
P
Shop Shark
I fired up my 350 in my '57 panel today for the first time. I've had the engine for 3 years, and time and life delayed me until now.

Upon firing it up today, it ran great, but I noticed smoking from the passenger side. I ran over to check, and the new paint on my new headers was BUBBLING. I quickly shut it down, but it sounded like it was running fine. The area most impacted were the exhaust headers for cylinders 2,4, and 6.

I did not have a temp gauge on the engine, as this was my first time firing it up, and no sending units are connected to anything. Any ideas on what could be driving the high heat? Was it just bc it was new paint taking a hit? Timing issue? Other?

Like I said, the engine ran solid, but I didn't want to let it keep going until something bad happened.

Last edited by pan3lman; Sat Aug 01 2020 09:59 PM.

1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: Noticing hot headers after first start of old engine.
pan3lman #1371696 Sat Aug 01 2020 10:13 PM
Joined: Feb 2004
Posts: 21,062
H
Boltergeist
Headers and paint- - - - -that's a lost cause! Powder coating, maybe, but I've never seen any kind of paint, including the "high temperature header paint" that will last more than a few minutes, or the first hard uphill pull, whichever comes first. The temperature sensors on our dyno headers would indicate exhaust port temps of 2,000 degrees or so on a full-throttle run under load. No paint in the world is going to survive temps like that.

Late ignition timing and/or a lean mixture will cause cast iron exhaust manifolds to run red hot. Headers will get hot enough to melt spark plug wires and blow out gaskets. After over 50 years of building race engines, somebody would have to chase me a long way to try to GIVE me a set of headers!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Noticing hot headers after first start of old engine.
pan3lman #1371698 Sat Aug 01 2020 10:18 PM
Joined: May 2015
Posts: 2,816
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Even powder coating will burn off.


Kevin
First car '29 Ford Special Coupe
#2 - '29 Ford pickup restored from the ground up.
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
Busting rust since the mid-60's
Re: Noticing hot headers after first start of old engine.
pan3lman #1371742 Sun Aug 02 2020 02:21 AM
Joined: Jan 2020
Posts: 160
P
Shop Shark
Thanks all for your replies- I knew the paint would burn off *eventually*, but not on fire 1!!

I had a pair of painted Hooker Headers on a 327, and they did not react like this in the beginning at all! These are Hedman headers, so, maybe they heat up quicker? I don't know, it was just really weird.

I will check the timing to be sure, but wow.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: Noticing hot headers after first start of old engine.
pan3lman #1371788 Sun Aug 02 2020 03:03 PM
Joined: Nov 2005
Posts: 5,777
3
3B Offline
Master Gabster
Hy pan3lman, are your headers connected to a full exhaust system, or are there just headers on the engine? If it has been sitting for a while could rodents have moved into the exhaust pipes and their nest be causing a restriction?

Re: Noticing hot headers after first start of old engine.
3B #1371789 Sun Aug 02 2020 03:09 PM
Joined: Jan 2020
Posts: 160
P
Shop Shark
Originally Posted by 3B
Hy pan3lman, are your headers connected to a full exhaust system, or are there just headers on the engine? If it has been sitting for a while could rodents have moved into the exhaust pipes and their nest be causing a restriction?
Thanks for your thoughts! The engine was sitting in my garage for 3 years with no exhaust headers on it. Once I reinstalled it in the truck about a month ago, I was sure to put plastic bags in the exhaust ports to mitigate the chances of anything getting into it while outside. I installed the headers about a week after that max, and all of that was only about 2-3 weeks ago. I don't know if there's any chance that anything could have been living inside the cylinders prior to the engine and header install, but I'm thinking that me firing it up yesterday would have changed that really quick! smile


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869
Re: Noticing hot headers after first start of old engine.
pan3lman #1371793 Sun Aug 02 2020 04:15 PM
Joined: Mar 2010
Posts: 926
Y
yar Offline
Shop Shark
Pan,

Flame sprayed aluminum is a header coating that gives a unique appearance, is permanent, will not discolor and prevents rust. I first saw it as a coating on air cooled radial aircraft engines and thought "That would look really cool on headers". So I took a set of headers I had just built to the aircraft engine shop where I saw the process applied to cylinders and had the headers coated. The result was perfect in every way.

That was decades ago and apparently aluminum flame spraying is still offered:

https://www.thermalspray.com/thermal-spray-coatings/thermal-spray-coating-processes/metalizing/

https://appliedmaintenance.com/what-is-tsa.html

I last had flame spraying done about 15 years ago on this roadster exhaust, and the coating is unchanged from the day it was applied. For a shiny surface the flame sprayed aluminum coating can be buffed and looks like any other polished aluminum.

Ray W

Attached Files
R & L '32.jpg (119.92 KB, 44 downloads)

Ray
Re: Noticing hot headers after first start of old engine.
pan3lman #1371796 Sun Aug 02 2020 05:04 PM
Joined: Dec 2017
Posts: 810
D
Shop Shark
Paint on headers, for a couple of minutes, lol. Usually does better then a couple of minutes if you used the hi temp stuff. If plasti cost, probably not. Could also be running lean at idle And higher temp for that reason. High temp powder paint works for a little while, but eventually fails. I have it on my headers and it started to fail after year two.

Last edited by Dragsix; Sun Aug 02 2020 05:05 PM.

Mike
Re: Noticing hot headers after first start of old engine.
Dragsix #1371798 Sun Aug 02 2020 05:29 PM
Joined: Jan 2020
Posts: 160
P
Shop Shark
Originally Posted by Dragsix
Paint on headers, for a couple of minutes, lol. Usually does better then a couple of minutes if you used the hi temp stuff. If plasti cost, probably not. Could also be running lean at idle And higher temp for that reason. High temp powder paint works for a little while, but eventually fails. I have it on my headers and it started to fail after year two.
I agree, and yep it was Rustoleum high temp. If I have time today, I'm going to throw my timing light on it to see if it's too retarded.


1957 Chevy Panel Truck, powered by SBC 350 from 1977 Camaro
Author, Bring CHANGE Into Your Life (a truly easy investment tool)
https://www.amazon.com/Bring-CHANGE-Into-truly-investment/dp/1077276869

Moderated by  Woogeroo 

Link Copied to Clipboard
Home | FAQ | Forum | Swap Meet | Gallery | Tech Tips | Events | Features | Search | Hoo-Ya Shop
Powered by UBB.threads™ PHP Forum Software 7.7.4