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  #11  
Old 03-21-2008, 10:19 AM
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C3 Starship C3 Starship is offline
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Default RE: '74 Exhaust question??

True dual exhaust, IMO, doesn't need the "H" or "X" cross over pipes.
I don't know of any advantage to using them. [sm=insomnia.gif]
There must be some reason.

I like the true dual exhaust, 'cause I can listen to, and see, what's goin' on with each bank of the engine.
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  #12  
Old 03-21-2008, 01:50 PM
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blueshark blueshark is offline
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Default RE: '74 Exhaust question??

It's a pressure thing. The X or H pipe helps to even out the back pressure. I noticed a change on my truck when I redid it with identical runs. If the pipes are bent in identical runs and constructed of the right size pipe,(not too small, not too big), than I can't see any reason to having either. I think they are more useful on systems with asemetrical bends,like on a 4x4, etc., where the pipes have to be routed differently.The vette allows for semetrical runs under or along side the car so like I said I don't see any reason for them,......but I'm no expert. Maybe you could PM Mech259, I would value his opinion. Too bad Lee Willis is nolonger a member, he would have an answer as well. Cheers
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  #13  
Old 03-21-2008, 03:23 PM
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C3 Starship C3 Starship is offline
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Default RE: '74 Exhaust question??

I can see the value of balance to the length of the two pipes. My '80 would have to have the "X" pipe, due to the single cross member pass through is to the passenger side.
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Gibson "Corvette"

1980 L-82 Fastback (forward too)
Mono composite front and rear.
Full adjust ride height and
response on all four Coopers.
400+ hp, 454, 3 sp stick w/OD,
3.07 in the rear

'07 H. D. Sportster, XL 883 EFI
'06 Silverado, Wife's
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  #14  
Old 03-21-2008, 03:37 PM
78buckshot 78buckshot is offline
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Default RE: '74 Exhaust question??

I haven't had any vehicle with a cross-over but the way I understand it the exhaust pulses from one bank help scavenge the other bank through the cross-over, even with equal length duals it is supposed to have some benefit.
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  #15  
Old 03-21-2008, 05:00 PM
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SCHOON SCHOON is offline
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Default RE: '74 Exhaust question??

FlowMaster makes an alum set up to replace your stock one.
I have stock 2" on my 74 but am going with 2 1/2" soon
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  #16  
Old 03-21-2008, 09:11 PM
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73shark 73shark is offline
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Default RE: '74 Exhaust question??

I think 78buckshot hit it on the head. I also remember reading where to properly position where to put the "H" pipe, you need to put temp sensitive paint on the exhaust pipe. This is where it gets a little foggy (destroyed too many brain cells in college and the Navy [sm=icon_guiness.gif]) but you either put it at the hot spot or cold spot.
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  #17  
Old 03-24-2008, 05:42 PM
jsholm2 jsholm2 is offline
 
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Default RE: '74 Exhaust question??

Will exhaust shops take the cats off to make it true exhaust?
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Old 03-24-2008, 05:42 PM
 
 
 
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