Y-pipe Question
#3
Member
Join Date: Oct 2003
Location: Edinburgh, Scotland
Posts: 359
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevy Camaro IROC-Z
Engine: 350ci from 79camaro
Transmission: 5 speed manual on lsd
Header Gauge Flange PRI OD PRI ID COL OD Col ID Pipe OD Pipe ID CAT OD CAT ID
Hedman 68470* 18 0.25 1.63 1.53 3.00 2.80 2.25 2.15 2.50 2.40
As per the header options sticky, where you see 68470 it's with the 17470 Y pipe.
So its 2.25" pipe from the headers to the Y collector and then 2.5" after. A common? mod is to cut the pipe after the Y and replace with 3" mandrel bent pipes.
Si.
Hedman 68470* 18 0.25 1.63 1.53 3.00 2.80 2.25 2.15 2.50 2.40
As per the header options sticky, where you see 68470 it's with the 17470 Y pipe.
So its 2.25" pipe from the headers to the Y collector and then 2.5" after. A common? mod is to cut the pipe after the Y and replace with 3" mandrel bent pipes.
Si.
#5
Member
Join Date: Oct 2003
Location: Edinburgh, Scotland
Posts: 359
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 Chevy Camaro IROC-Z
Engine: 350ci from 79camaro
Transmission: 5 speed manual on lsd
No. You've simplified it way too much.
The primaries are 1 5/8" (this is the pipe from the head)
After the header's collector it is 2.25" (after the 4 to 1)
After the Y pipe collector it is 2.5" (this is the bit that connects to the rest of the system to the rear)
The only bit of that system which is poor is the 2.5" section. I've heard of folk replacing the section after the Y collector with 3" mandrel bent pipe section to improve it considerably.
Si.
The primaries are 1 5/8" (this is the pipe from the head)
After the header's collector it is 2.25" (after the 4 to 1)
After the Y pipe collector it is 2.5" (this is the bit that connects to the rest of the system to the rear)
The only bit of that system which is poor is the 2.5" section. I've heard of folk replacing the section after the Y collector with 3" mandrel bent pipe section to improve it considerably.
Si.
#6
TGO Supporter
Thread Starter
Join Date: Oct 2002
Location: Saskatoon, SK, Canada
Posts: 9,067
Likes: 0
Received 1 Like
on
1 Post
Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
I have the 68470 headers. They are 1-5/8" primaries and 3" collectors. I know because I measured them. So I know about the headers, I already have those.
Its the y-pipe I need to know about. So you are saying that the main pipe (the one that a cat-back would hook up to) is 2.5"?
What size are the other two pipes? The ones that connect to the headers? Those are 2.25"?
Its the y-pipe I need to know about. So you are saying that the main pipe (the one that a cat-back would hook up to) is 2.5"?
What size are the other two pipes? The ones that connect to the headers? Those are 2.25"?
#7
Senior Member
Join Date: Jul 2002
Location: Saskatchewan
Posts: 631
Likes: 0
Received 1 Like
on
1 Post
Car: 1992 GTA
Engine: LS1
Transmission: T56
Axle/Gears: 4.10
Yes each pipe that bolts to each header collector is 2 1/4 inches in diameter. And yes the main piece is 2 1/2 inches in diameter. But as already stated you simply cut off the 2 1/2 inch piece and have a 3" MANDREL bent piece installed instead. I did this already on my GTA. If I ever get it up to the track this month I can show you how it turned out.
Thread
Thread Starter
Forum
Replies
Last Post
hectre13
Engine/Drivetrain/Suspension Parts for Sale
6
09-08-2015 03:38 PM
downsouthboy
Tech / General Engine
4
08-29-2015 11:29 AM