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post #1 of (permalink) Old 07-16-2002, 12:35 PM Thread Starter
 
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Exhaust Question

My father has a 78' Chevy 3/4 ton and he is putting straight pipes on it, he wants to go dual. The motor is a 454 what size pipe do you reccomend?
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post #2 of (permalink) Old 07-16-2002, 12:57 PM
 
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Re: Exhaust Question

2.5 to 2.75 would be the best, 3" at the largest. Just my opinion and foggy recollection of what people have said.
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post #3 of (permalink) Old 07-16-2002, 02:08 PM
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Re: Exhaust Question

A long toime ago summit racing mag had an article on that. If I remember right I think dual 2.5's are enough for a built big block. That was from a long time ago
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post #4 of (permalink) Old 07-16-2002, 03:24 PM
 
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Re: Exhaust Question

mnorby, 2.5's are the best ideal size, but why not go with 3" of tubing?
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post #5 of (permalink) Old 07-16-2002, 04:15 PM
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Re: Exhaust Question

here was my reason:
dual 2.5"= $ 200
dual 3"= $ 350 ish plus had to drive 90 miles to a place that had a 3" bender. I think 3" straight pipe would be way cool though.
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post #6 of (permalink) Old 07-16-2002, 10:27 PM
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Re: Exhaust Question

Unless the thing is a fire breathing, drag racing, 7000rpm monster of a 454 engine, dual 3" pipes won't have enough back pressure. Yes folks, you actually need some. You will be loosing low end torque (where most of us 4x4 truck guys need it) in favor of high end hp (when was the last time your 4x4 truck 454 saw over 3,000rpm?[img]images/icons/tongue.gif[/img]) I'd go with dual 2.5's, or 2.75's if you can find them.

Don't forget the H-pipe.
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post #7 of (permalink) Old 07-16-2002, 10:34 PM
 
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Re: Exhaust Question

<font face="Times New Roman">
<font color=green>My two cents - Ditto what Andy said. 3" is too big. It may be cool looking, but why sacrifice power just to have pipes that are .5" larger in diameter?
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post #8 of (permalink) Old 07-17-2002, 01:45 AM Thread Starter
 
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Re: Exhaust Question

I was thinking 2.5s or 2.74 but I wasn't sure. Thanks for the info, the neat thing is that if I get the money I might buy it off him and make a play toy.
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