350 header question
#1
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Car: 91Z28
Engine: 5.7 ls1
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350 header question
I have a question would this headers fit my 89 350 tpi engine
http://store.summitracing.com/partde...5&autoview=sku
or should i get these
http://store.summitracing.com/partde...5&autoview=sku
Would like to know because i am rebuilding my engine and the headers are cracked
http://store.summitracing.com/partde...5&autoview=sku
or should i get these
http://store.summitracing.com/partde...5&autoview=sku
Would like to know because i am rebuilding my engine and the headers are cracked
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Car: 1991 Pontiac Firebird
Engine: 3.1L V6
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Re: 350 header question
Yes, The first ones will fit (not very well, but they fit), But you'd probably be happier with the full length headers. Also the ball and socket flange on the long tubes seal better than the 3 bolt flange on the shorties.
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Car: 1991 Pontiac Firebird
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Re: 350 header question
I'll just put it this way, The long tubes will give you better torque and horsepower than the shorties. With the bigger primaries and the 3" collector of the long tubes your engine will breath better. So yeah the long tubes will be better for your engine. Connecting them to the existing exhaust might be a pain though, You'll probably have to make a custom y-pipe (I'll let someone else tell you whether or not there is a y-pipe made for the 3rd gen's with long tubes, Because I'm not sure).
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
yes, but the long tubes are alot better for power gains as taz stated. shorties yeild better ground clearance and ease of install. i run the long tubes. u will need collector extensions like these http://www.jegs.com/i/Hedman/500/18805/10002/-1
you will also have to run new exhaust, imo long tubes are the way to go, even with the headaches of the install
you will also have to run new exhaust, imo long tubes are the way to go, even with the headaches of the install
Last edited by iroc a 86 berli; 01-19-2009 at 11:07 PM.
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Re: 350 header question
Since I'm old and lazy, I like the easy route: I'd buy shorties which INCLUDE the Y pipe, such as the Hooker 2055's. You really don't need more than that for a stock motor, IMO. I run them on my 350/330 with good effect anyway. No ground clearance issues with them either--hey, my car is low enough as is. Though it's probably more than you wish to spend, here's a direct-fit system (no welding, no cutting, no bending, etc.): Hooker 2055's (Jeg's 520-2055). Catco high-flow converter (Summit CTO-9118). Hooker catback (Summit HOK-16823HKR).
JamesC
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
if you have the engine out i would def go long tube, set the headers in the bay before droping your engine into the bay. use a bungie to secure them to the fender wells. thats the hardest part of the install for long tubes. the collector extensions will bolt right on. they route under the crossmember. i used clamps like this http://www.jegs.com/i/Dynomax/289/33226/10002/-1 and these mufflers,
http://store.summitracing.com/partde...5&autoview=sku
all 3in, my car is lowered about 2in as well, so they scrape a bit, 2 1/4 or 2 1/2 will work for you alot better.
http://store.summitracing.com/partde...5&autoview=sku
all 3in, my car is lowered about 2in as well, so they scrape a bit, 2 1/4 or 2 1/2 will work for you alot better.
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
i have about 2in on level ground, they scrape on roads where big trucks make ruts, and steap driveways. i rarly street the car cause its extremely loud. i want to add som 45deg bends to dump out in front of the back wheels, hoping it might quit it down a bit.
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Car: '91 Z28 L98 G92
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Re: 350 header question
If you are going with shorties, be sure to consider headers from Dyno Don, on this site. They're 1.75" primaries with (IMO) excellent form, fit and function.
Bill
Bill
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
right on, if i have my cage in and still have a DL, im in! kinda in the hot seat out there.
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
look them up, they arent cheap, but they are superior to the ones you have listed
#17
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Car: Building a 1984 Z28
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Re: 350 header question
I put on some long tube hedman and they are great a little headache with piping but was already getting full done anyways
#18
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Car: 91Z28
Engine: 5.7 ls1
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Axle/Gears: 3.42
Re: 350 header question
I will get the long tubes it won't scrape the ground right my car is stock height and would i need the y pipe too with the long tubes and what muffler should i put i am thinking thunder series flowmaster
#20
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 350 header question
with the shorties i won't have to right and what muffler would you recommend me
#21
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Car: 86 berlinetta 92rs gfx
Engine: 4 bolt 384 stroker
Transmission: th350 4000 stall manual/T brake
Axle/Gears: 87 iroc 9 bolt
Re: 350 header question
i may be wrong, but there is no y pipe for the long tubes. sounds like you should just go the bolt on way, and get the shorties. i would at least rec the flowtech ones over the summits. as for mufflers that is your choice, just remeber that these cars ar very limited in ground clearance even at stock ride hieght. you best bet is to mount the mufler/muflers in the stock location, in that case go with a flowmaster single in dual out so it at least looks cool and will have a decent sound.
#22
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Car: 91Z28
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Re: 350 header question
I told my uncle he is a mechanic and he told me he willl help me out a way to put the long tubes thank you guys for all the help
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