F250 with or without catalytic convertors?
Junior User
Joined: May 2004
Posts: 77
Likes: 0
From: Tucson
My .02
I have a 1978 F150 2wd 8' bed, with a 460 (factory 460 SuperCab).
No cats and it passes emmissions in AZ fine. I was told GVWR had to do with whether the cats were required or not. I think my truck is a 6800GWR, but not sure. Its a trailer special.
The emmission stickers I viewed online for these trucks indicated that the engine family is what caused need for cats.
I have an orange sticker for emmissions (reproduction) that says NON-CATALYST heavy duty motor. It lists 370/429/460 as the "heavy duty motor".
When I go thru emmissions I bring this unused reproduction sticker with me, but they've never asked about cats. I just figure for a $5.00 sticker it may end up saving me some time so I bring it.
No cats and it passes emmissions in AZ fine. I was told GVWR had to do with whether the cats were required or not. I think my truck is a 6800GWR, but not sure. Its a trailer special.
The emmission stickers I viewed online for these trucks indicated that the engine family is what caused need for cats.
I have an orange sticker for emmissions (reproduction) that says NON-CATALYST heavy duty motor. It lists 370/429/460 as the "heavy duty motor".
When I go thru emmissions I bring this unused reproduction sticker with me, but they've never asked about cats. I just figure for a $5.00 sticker it may end up saving me some time so I bring it.
Senior User
Joined: Sep 2003
Posts: 364
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From: Hartland, MI
I think 6000 GVW was the cut off for cats. I have a 77 F-150 with a 6050 GVM, just high enough to avoid cats. GMC did this with their "Heavy Half" in the 70's and Chevy did it with their "Big 10" models. It was just a way to edge over the GVW limit.
Posting Guru
Joined: Feb 2004
Posts: 1,388
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From: Saratoga, NY
What is the big deal with having cats in the first place? I don't have them on my truck but I almost feel sorry for people behind me choking on all those hydrocarbons I'm puking out, and if I'm driving behind somebody without them I can tell, sure isn't pleasant to breathe.
Senior User
Joined: Sep 2003
Posts: 364
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From: Hartland, MI
If your engine is tuned correctly it shouldnt smell too bad. When you smell a guy in front of you very strongly it usually means he is burning oil or has something out of wack, timing fuel mixture etc
Tuned
Joined: Jul 2001
Posts: 439
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From: Erie, Pa
Show me 1 well tuned engine from the factory in the 70's. All they did was to lean out a motor to burn hotter, and burn less fuel (hence no power what so ever).
Steve S.
To many to list
Steve S.
To many to list
Originally Posted by zwinstead
If your engine is tuned correctly it shouldnt smell too bad. When you smell a guy in front of you very strongly it usually means he is burning oil or has something out of wack, timing fuel mixture etc
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Posting Guru
Joined: Feb 2004
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From: Saratoga, NY
Originally Posted by zwinstead
If your engine is tuned correctly it shouldnt smell too bad. When you smell a guy in front of you very strongly it usually means he is burning oil or has something out of wack, timing fuel mixture etc
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