Tailpipe?
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Fleet Mechanic
Joined: Sep 2014
Posts: 1,626
Likes: 78
From: NE Texas
Tailpipe?
1978 LB 300cid with C6.... have EFI manifolds, Walker Y-pipe sourced - already got good advice for a muffler but the tailpipe is surprisingly difficult to source. Would like if possible to buy a 2.5" pipe for it... can probably live with 2.25". The old pipe is a whopping 1 7/8" and that seems to be all anyone lists when I check the usual catalog suspects, unless I go to a much later model truck - at which point I am not sure whether a pipe for say a '95 will fit right on a '78. Anyone happen to know a number for a larger pipe that will bolt on OK? (Tried posting a similar request on th Exhaust forum with no response months ago)
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
Give the RPM and HP level for a 300, a dual 2.25 system is good to go. Any bigger and there would be a loss of scavenging.
Another option is 2.25-inch muffler inlets and a single, 2.5-inch outlet.
Another option is 2.25-inch muffler inlets and a single, 2.5-inch outlet.
Laughing Gas
Joined: Sep 2003
Posts: 968
Likes: 5
From: Corbett, Oregon
Can't speak for our dents and later rigs, but ...
I had a '97 F-350 ('92-'96 body) and a muffler back exhaust system from an '87 F-350 slipped right in place, up and over the axle and out behind the rear wheel. Factory hangers and all.
Good luck.
I had a '97 F-350 ('92-'96 body) and a muffler back exhaust system from an '87 F-350 slipped right in place, up and over the axle and out behind the rear wheel. Factory hangers and all.
Good luck.
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More Turbo
Joined: Nov 2010
Posts: 682
Likes: 15
From: NB, Canada
I have EFI manifolds on my 300. Custom built y-pipe into 2.5 single.
I pulled a muffler and tailpipe from a 2010 F150 at the junkyard, paid $50 for it, the muffler fits great, its all 2.5" and mandrel bent. Also has a nice shiny tip
I pulled a muffler and tailpipe from a 2010 F150 at the junkyard, paid $50 for it, the muffler fits great, its all 2.5" and mandrel bent. Also has a nice shiny tip
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Fleet Mechanic
Joined: Sep 2014
Posts: 1,626
Likes: 78
From: NE Texas
Shane -0 what yearis your truck?
HIO - think we're somewhat on the same page, I want to stick with a single exhaust and like the idea of 2.25-2.5" for improved flow - at the 300's hp any more is probably silly and possibly countereffective. I am just hoping to find something off the shelf, even if from another year, so I could do the work myself (and should be cheaper than having a shop make one.).
HIO - think we're somewhat on the same page, I want to stick with a single exhaust and like the idea of 2.25-2.5" for improved flow - at the 300's hp any more is probably silly and possibly countereffective. I am just hoping to find something off the shelf, even if from another year, so I could do the work myself (and should be cheaper than having a shop make one.).
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