Exhaust manifolds or headers? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 11-26-07, 05:01 PM Thread Starter
Registered User
Join Date: Dec 2006
Posts: 81
Exhaust manifolds or headers?

I'm building my 460 for towing an RV trailer around. I had kind of settled on using exhaust manifolds but after doing some research am really scared of the breakage issue with them and now considering headers. The way I look at it, I have 3 options. I can install new aftermarket exhaust manifolds with gaskets, install new exhaust manifolds without gaskets as some have suggested, or go to headers. The engine will be installed in my 1978 Ford PU F350, which came factory with the 400 so I'll be doing a swap to the 460. I see that Hedman carries headers they say "For engine swap" which are more expensive than the one designed to go into the 460 pickup applications. I'm not sure why the headers would be different from a swapped body as one that came originally came with a 460 unless there is an interference problem using the 400 cu frame stands with the engine swap engine mounts. My only experience with headers was years ago when I was a teenager and had a cheap set on my FE block and they were always loose and generally a lot of trouble. Long story short I'm looking for the best long-term solution given my situation. The engine will be subject to head temperatures I expect to be fairly high considering what I will be towing, especially in the mountains. If I understand correctly the manifold breakage is caused by uneven expansion from the cylinder head and the exhaust manifold during heating and cooling. What do you think?

Thank you,


Rlzegers is offline  
Sponsored Links
post #2 of 2 (permalink) Old 11-30-07, 06:58 PM
Registered User
Join Date: Aug 2005
Posts: 2
Re: Exhaust manifolds or headers?

I have a 1990 Class "A" with a 460 and I had the passenger side manifold warp on my unit. I removed the manifold and had it machined to true. Then I installed studs into the heads, renewed the manifold gasket and used nuts with thick Belleville washers. I now have over 10,000 miles on them and there is no problem. While I was at it, I did the same to the driver's side.

Two more things that I did is that when I shut down the engine, I give it a little cool down time before I shut off the engine. The other thing that I did was, while the manifolds were off, I sandblasted them and coated them with Never-seize. They look almost new today. This is an old trick that I used with aircraft engines. Let the manifolds cook after you do this in a well ventilated area, as they will stink until cooked. But no more rusty look in my wheel wells.

I did buy a set of Headers, but due to my Oshkosh frame, I would had to have moved all the brake lines, master cylinder, cruise control module and several electric looms to allow them to be cool during running with headers. Not worth the effort.

photog101 is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > The Garage - Tech Forums > Engine Specific Tech > 429-460 Tech

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome