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07-04-2008, 07:41 AM
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#1 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | difference in 5.0 and 5.7 headers? like the tittle says if i buy headers now for my 305 and when i swap in my 350 will i have to buy new headers? |
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07-04-2008, 09:38 AM
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#2 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Not if the headers you buy now are large enough to not choke a 5.7. |
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07-04-2008, 11:10 AM
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#3 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? ok thats kinda what i thought thanks |
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07-04-2008, 12:18 PM
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#4 | | Senior Member
Join Date: Mar 2003 Location: Florida
Posts: 3,265
Car: 1987 Black IROC-Z (original owner) Engine: 350 Crate with TPI Transmission: 700R4 with 2400 SLP Stall | Re: difference in 5.0 and 5.7 headers? 1 5/8 or 1 3/4 header size should work for a 305/350. |
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07-04-2008, 01:05 PM
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#5 | | Senior Member
Join Date: Jul 2006 Location: West Palm Beach, FL
Posts: 303
Car: 1986 Pontiac Firebird S/E Engine: 305 carb'd V8 Transmission: 4-speed auto Axle/Gears: Stock | Re: difference in 5.0 and 5.7 headers? The block is the same so headers should be the same. |
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07-04-2008, 01:06 PM
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#6 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Headers don't bolt to the block. |
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07-04-2008, 09:07 PM
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#7 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by Apeiron Headers don't bolt to the block. |  i didnt think that needed to be pointed out on a car forum, so am i right to assume that the exhaust ports on all heads are identical in space between them, location etc? at least for a chevy small block |
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07-04-2008, 09:26 PM
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#8 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Yes, as long as you stay away from exotic things like raised ports. |
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07-04-2008, 09:34 PM
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#9 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? ok thanks now shifting gears a little bit would you recomend long tube or shorteys? you seem to have a bit of knowledge on the subject |
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07-04-2008, 09:46 PM
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#10 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? If it's going to be street driven, long tubes aren't worth the extra trouble. |
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07-04-2008, 09:49 PM
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#11 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? whats the extra trouble if i buy a whole new exhaust? |
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07-04-2008, 09:53 PM
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#12 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Do a search and you'll see. |
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07-04-2008, 10:04 PM
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#13 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? ok i will thanks |
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07-04-2008, 10:15 PM
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#14 | | Senior Member
Join Date: Jul 2006 Location: West Palm Beach, FL
Posts: 303
Car: 1986 Pontiac Firebird S/E Engine: 305 carb'd V8 Transmission: 4-speed auto Axle/Gears: Stock | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by Apeiron Headers don't bolt to the block. | I never said they did. |
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07-06-2008, 07:27 AM
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#15 | | Senior Member
Join Date: Aug 2005 Location: s.n.j.
Posts: 361
Car: 1984 T/A WS6 Engine: L69 305 Transmission: 700r4 Axle/Gears: fact G80 with GT4 3.73 | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by Apeiron If it's going to be street driven, long tubes aren't worth the extra trouble. | only true if u have a lowered car. if my car was goin to be lowered i would have not run duals.
with my duals, i have no problems with clearence.it depends on how they are tucked. x pipes will yeild less ground clearence than an H-pipe. also the S-bends will have to be turned inward towards eachother.
u are however limited to what kind of mufflers u run. a thin style muffler will be best as far as mufflers go. i have dynomax bullets. loud mouths and bullets will give the best ground clearence. |
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07-06-2008, 08:46 AM
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#16 | | Moderator
Join Date: Mar 2000 Location: Littleton, CO USA
Posts: 28,147
Car: 82 Berlinetta(2)/57 Bel Air Engine: 86 LG4-> ZZ3(LS1)/mild 396 Transmission: TH700(T56)/TH400 Axle/Gears: 3.23(4.10)/3.73 | I agree with Aperion. You can't "buy" an exhaust system for long tube headers. Whatever you do will have to be fabricated, and since a typical aftermarket system designed for '86-'90 TPI single cat will handle a street 350 just fine, going through the fabrication hassle (and probably expense) of long tubes isn't worth it. |
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07-06-2008, 12:37 PM
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#17 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by ws6blackhawk88 only true if u have a lowered car. if my car was goin to be lowered i would have not run duals. | There are more hassles than just ground clearance. I have long tubes with dual exahust on my 84 because it's my track car. For anything else that was street driven I'd save a whole bunch of my time, aggravation and money, and just bolt up a good cat back with shortys. |
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07-06-2008, 02:32 PM
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#18 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? i think i might just buy some shorties, i seen a set from summit for $90  and then invest in a nice 3" catback or something but from what ive heard shorties are not that much better then stock manifolds and honestly i find that hard to believe  |
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07-06-2008, 03:13 PM
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#19 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? You get what you pay for with headers, as with everything else. If the $90 ones you saw were Flowtechs (or Summit's own brand, which are made by Flowtech), you're better off spending a little more money on something else. Those ones only have 1 1/2" primaries and a poor Y pipe design, which is barely adequate for a 305, let alone a 350. |
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07-06-2008, 03:21 PM
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#20 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by Apeiron You get what you pay for with headers, as with everything else. If the $90 ones you saw were Flowtechs (or Summit's own brand, which are made by Flowtech), you're better off spending a little more money on something else. Those ones only have 1 1/2" primaries and a poor Y pipe design, which is barely adequate for a 305, let alone a 350. | oh i wouldnt buy them i was just sayin thats efin cheap lol so is flowtech a stay away brand? i was lookin at a set of hookers on there for roughly $200 |
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07-06-2008, 03:24 PM
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#21 | | Moderator
Join Date: Jan 2000 Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 14,290
Car: 1984 Z28 Hardtop / 1988 IROC T-top Engine: 383 Carb / 305 TPI Transmission: 4L60 / T-5 Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt | Re: difference in 5.0 and 5.7 headers? Flowtech/Summit headers are the bottom end of the scale. They're better than manifolds, but not nearly as good as more expensive headers.
A popular choice is the Hooker 2055s. About $450 gets you the Y pipe as well (keep in mind many headers don't include the Y pipe when you're comparing the price), and they'll work with all the factory emissions equipment. |
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07-06-2008, 09:14 PM
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#22 | | Senior Member
Join Date: Jul 2007
Posts: 466
Car: 1984 Z28 Engine: L69, lookin for a 350 TPI Transmission: 700R4 Axle/Gears: 3.73 posi | Re: difference in 5.0 and 5.7 headers? Quote:
Originally Posted by Apeiron Flowtech/Summit headers are the bottom end of the scale. They're better than manifolds, but not nearly as good as more expensive headers.
A popular choice is the Hooker 2055s. About $450 gets you the Y pipe as well (keep in mind many headers don't include the Y pipe when you're comparing the price), and they'll work with all the factory emissions equipment. | thats sounds like a good deal i dont want to spend 2 days foolin around just tryin to install headers then take em out again when i drop in my new motor |
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