The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-14-2005, 07:21 PM   #1
uk72step
outta the car velocityboy
 
uk72step's Avatar
 
Join Date: Nov 2004
Location: Scotland
Posts: 112
2.25" Duals

Happy Friday,
It's garage time!!! woohoo.
Righto so kicked over the truck today and just about lost my ears drums. Interior resonance was a killer. Turns out there is now a lovely hole in one of my pipes near the rear wheel (usual place I guess).
So am needing to change the exhaust. It has 3" duals on it with resonator tips only running from a set of hedman headers. I'm sure it was great for the PO with the Big block & blower in it but its a bit loud n am sure way too big bore.
However PO put a 78 vette pace car engine in it. I contacted dynomax they reckon a 2.25" dual system will be fine for my requirements now.

Are any of you guys running a dual 2.25" system?
Also will a 73 system fit,as I seem to many of these ready to fit header back kits for 73 onwards but nothing for our trucks.... Any feedback appreciated..........
__________________
..give it a turn here, take some wedge out there, we'll win some races...
uk72step is offline   Reply With Quote
Old 01-14-2005, 08:30 PM   #2
lukecp
Formerly yellow72custom
 
lukecp's Avatar
 
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
If your truck has coil springs, i doubt it. Its possible that the '73 up system would fit if you have leaves. The pipe routing gets tricky around the rearened and trailing arms.

A 2.25" system should be fine for a mild-stock 350. Personally, i've had good luck just taking my stuff to local muffler shops and having them custom make a system....it will cost more than a pre-fit system but you can get them fully welded instead of clamped and you don't have to mess with it yourself.

If you want some reasonably priced mufflers with a mellow tone that isn't too loud, go with Dynomax Super Turbos...enough of a rumble to let people know you have a V8, but still plenty quiet so it dosne't get annoying.
__________________
'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride.
'70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck.
'97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg
lukecp is offline   Reply With Quote
Old 01-15-2005, 08:01 AM   #3
uk72step
outta the car velocityboy
 
uk72step's Avatar
 
Join Date: Nov 2004
Location: Scotland
Posts: 112
Thanks Yellow,

Anyone else got some feedback?
Would be looking for low & mid range torque if I do any engine mods as opposed to top end horsepower and I understand smaller bore assists this......

Cheers
Lee
__________________
..give it a turn here, take some wedge out there, we'll win some races...
uk72step is offline   Reply With Quote
Old 01-15-2005, 08:20 AM   #4
Longhorn Man
its all about the +6 inches
 
Longhorn Man's Avatar
 
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
As much as I hate LMC, look at there prebent pipes. I can't remember the size of them, but I have only heard good things about there pipes and at a good price too.
Longhorn Man is offline   Reply With Quote
Old 01-15-2005, 09:15 AM   #5
'70_402
Senior Member
 
'70_402's Avatar
 
Join Date: Dec 2003
Location: Pampa, Texas
Posts: 1,553
i have 2.5" pipes ran all the way back with coil springs and no routing problems at all..if this thing has a big block in it i would at least go with 2.5" if not 3" depending on how hot the motor is..
'70_402 is offline   Reply With Quote
Old 01-15-2005, 10:14 AM   #6
Tx Firefighter
Watch out for your cornhole !
 
Tx Firefighter's Avatar
 
Join Date: Jun 2003
Location: Azle, Texas
Posts: 14,162
That 78 Vette 350 isn't a powerhouse no matter how you look at it. I'd definitely run 2.25 inch system. Myself, I run 2.25 on small blocks and 2.5 on big blocks.
__________________
I'm on the Instagram- @Gearhead_Kevin
Tx Firefighter is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -4. The time now is 02:18 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com