'78 351M exaust
Junior User
Joined: Mar 2002
Posts: 93
Likes: 1
From: Montrose USA
'78 351M exaust
Hi all,
I have a '78 F150 4*4 with a 351M. I live in an area with no emmision inspections. The current exaust which was there when I got the truck has no cats. The engine emission sticker says non-catalyst. Did this engine come from an earlier truck or is this a non catalyst truck. I am planning on putting duals under it and I need to know. If it truely is non catalyst there is a great muffler shop in town that does a beautiful job. Otherwise I gotta crawl under it and do it. I hate doing exaust. Secondly how are people routing it. I want to dump before the wheels cause anything after runs a good chance of getting ripped off. Can I just run the exaust back on the right side and then dump down in front of the axle or do I have to (legally) plumb it out the side? Sorry for the long post and thanks for your input.
I have a '78 F150 4*4 with a 351M. I live in an area with no emmision inspections. The current exaust which was there when I got the truck has no cats. The engine emission sticker says non-catalyst. Did this engine come from an earlier truck or is this a non catalyst truck. I am planning on putting duals under it and I need to know. If it truely is non catalyst there is a great muffler shop in town that does a beautiful job. Otherwise I gotta crawl under it and do it. I hate doing exaust. Secondly how are people routing it. I want to dump before the wheels cause anything after runs a good chance of getting ripped off. Can I just run the exaust back on the right side and then dump down in front of the axle or do I have to (legally) plumb it out the side? Sorry for the long post and thanks for your input.
Logistics Pro
Joined: Feb 2000
Posts: 3,955
Likes: 50
From: Mesa
'78 351M exaust
An easy way to check for catalyst is look at the fuel guage. If it says "Unleaded Fuel Only" then it should have had a cat on it. Exhaust laws differ from state to state. Check with your local agency or exhaust shop. Any muffler shop should be able to make up a good system for you. Don't use anything smaller than 2 1/4" tubing. I would use 2 1/2" if the shop uses a ram type bender. Install a crossover pipe if there is room.
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