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Username Post: Performance exhaust questions?        (Topic#360224)
1965C-10 
Very Senior Member
Posts: 7324
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
03-20-20 08:47 PM - Post#2789088    

I'm getting ready to get my 1965 C10 shortbed fleetside back on the road.

Years ago I swapped in a big block Chevy and TH400, was pretty sure it was 454, after running the numbers, it turned out to be a 1968 Chevy truck 396, 310 gross HP.

I bought Pro Flo 4 multi port fuel injection for BBC with oval heads, and thinking of adding headers and new exhaust before the conversion.

Wanting to try Hooker Aerochamber mufflers, also need O2 sensor bung welded on, I don't have welding skills.

Went to exhaust shop, owner says 2.5 inch pipes are plenty, also he does not believe in x pipes, also he doesn't have mandrel machine or use mandrel pipes.

The quote for me driving up with my new long tube headers installed already, and 2 brand new mufflers I have bought through online place like Jegs or summit (he has never installed Aerochamber mufflers) for him to bend up some 2.5 pipes and weld, it will be roughly 450 bucks.

He went on and on that mandrel bent it not needed.

I may build a 454-496 big block one day, to drop in truck.

Right now the exhaust is 2 in duals with super turbo mufflers, dumping out in front of rear tires, this was taken from the 1974 C10 BBC truck, it's decent no leaks, except driver's side muffler has a loose baffle and sounds kind of weird when revving up.

Are exhaust shops with mandrel pipes hard to find?

I'm in the Phoenix area.





 


YOUNG57 
Frequent Contributor
Posts: 1186

Loc: Tennessee
Reg: 12-06-10
03-21-20 06:48 AM - Post#2789105    
    In response to 1965C-10

Few shops have mandrel benders. And that shop has other issues I would stay away from.

Have you tried shopping online for pipes for your truck? They will fit better than anything a local shop can make and you can get mandrel bends and X or other crossovers.




 
someotherguy 
Senior Moderator
Posts: 29102
someotherguy
Age: 49
Loc: Texas
Reg: 08-01-03
03-21-20 07:11 AM - Post#2789111    
    In response to YOUNG57

The shop telling you that you don't need what they can't provide would be a red flag for me and enough to take my business elsewhere.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
Shepherd 
Frequent Contributor
Posts: 2006

Loc: Lake George, NY
Reg: 11-11-15
03-21-20 07:29 AM - Post#2789114    
    In response to someotherguy

Seconded



 
55 Shaker 
Member
Posts: 1530

Age: 70
Loc: north central IL.
Reg: 03-13-06
03-21-20 08:33 AM - Post#2789123    
    In response to YOUNG57

If mandrel pipes weren't better they wouldn't have designed and manufactured them.

The older I get, the more dangerous, I am !!!!


 
1965C-10 
Very Senior Member
Posts: 7324
1965C-10
Age: 42
Loc: San Tan Valley AZ "Phoeni...
Reg: 11-18-01
03-21-20 10:15 AM - Post#2789134    
    In response to YOUNG57

  • YOUNG57 Said:
Few shops have mandrel benders. And that shop has other issues I would stay away from.

Have you tried shopping online for pipes for your truck? They will fit better than anything a local shop can make and you can get mandrel bends and X or other crossovers.




I have looked at dual exhaust kits, maybe that is the way to go and use the good quality clamps.

Will look more at those.

What does everyone think on pipe size, 2.5 or 3 inch?






 
Shepherd 
Frequent Contributor
Posts: 2006

Loc: Lake George, NY
Reg: 11-11-15
03-21-20 10:18 AM - Post#2789136    
    In response to 1965C-10

2.5 is your best bet and an xpipe or h pipe is the way to go.



 
Ray P W 
Contributor
Posts: 485

Reg: 09-30-15
03-21-20 11:16 AM - Post#2789141    
    In response to Shepherd

1965C-10,

Another option you have is buying mandrel bent U or J bends and fabricating a system yourself. I did that for my son's sbc powered 1966 C-10 with "block hugger" headers. The exhaust pipes are a tight fit in the starter and oil filter areas. Making a custom exhaust pipe with an "H" balance tube assured an actual fit instead of having to hammer indentations into ill fitting commercially available pipes to clear various obstacles. I used 2 1/2" tubing.

I'd be glad to send you a photo of what I built so you can see how simple it is. The main thing is it fits.

Ray W



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17463
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
03-21-20 11:26 AM - Post#2789143    
    In response to Ray P W

DEFINATELY...
find a better, more capable and better equipped exhaust shop!!!

and yeah dual 3" with an x-pipe WILL provide better results in power, but it may be slightly louder

https://www.youtube.com/watch?v=_PVXvHkr-Vs&a mp;t=...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 03-21-20 11:30 AM. Reason for edit: No reason given.

 
bobb 
Super Senior Member
Posts: 5554

Loc: paradise
Reg: 09-05-03
03-22-20 02:21 AM - Post#2789203    
    In response to 1965C-10

bigger pipes seem to have a deeper throatier sound at lower rpms in my experience. i have always liked it. x or h pipe will smoothen out the exhaust note. bigger mufflers seem to have a narrower selection. im trying to save up my lunch money for 3 inch flowblaster 70 series or something similar in size to tame the volume of large pipes

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25080
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-22-20 07:31 AM - Post#2789219    
    In response to bobb

Take a sound ride in my truck. Camaro headers, dual exhaust, no cats, 2.5" pipe, X-pipe, dual Magnaflows, and dump after axle. SWB truck.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
MikeB 
Ultra Senior Member
Posts: 10073
MikeB
Loc: Plano, TX
Reg: 08-28-03
03-22-20 09:37 AM - Post#2789231    
    In response to 1965C-10

  • 1965C-10 Said:
Went to exhaust shop, owner says 2.5 inch pipes are plenty, also he does not believe in x pipes, also he doesn't have mandrel machine or use mandrel pipes.

He went on and on that mandrel bent it not needed.





So, essentially he has no clue.

Look for a complete kit or find someone who can piece together straight sections and mandrel bends.

FYI, 2.5" crush bends probably flow no better than 2" pipes with mandrel bends. Not optimal for a BBC.



1982 C10 SWB pickup: Unmolested base truck, original paint. Originally had 250 six and 3-on-the-tree
Now has 355 with Vortec heads, RamJet roller cam, LS6 beehive springs, TH350
Retired, but working part-time on 50s-70s cars & trucks.


Edited by MikeB on 03-22-20 09:39 AM. Reason for edit: No reason given.

 


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