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1 7/8 headers?

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Old 01-29-2010, 04:44 AM
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Default 1 7/8 headers?

Guys I have 1 3/4 Pacesetters on my car right now. I will be putting in a 383 in the near future. Would it be better if I go to 1 7/8 headers for the larger motor? Thanks.
Old 01-29-2010, 07:44 AM
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i would say not necessary unless you are going with a good flowing set of heads intake and cam. even then they may move the power band higher in the rpm range than you need, unless this is mostly a track car.
Old 01-29-2010, 08:12 AM
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you'll get more power

whether that power is worth the cost/effort is totally up to you
Old 01-29-2010, 09:39 PM
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Its a weekend warrior. But will see some track time. Motor has a GT2-3 cam, LS6 heads that have been worked. I also have the Fast 90/90 already which I will be putting on the motor. I'm eventually going to put either a Maggie or ProCharger on there also but not right now.
Old 01-30-2010, 07:20 AM
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Originally Posted by 98LS1auto
Its a weekend warrior. But will see some track time. Motor has a GT2-3 cam, LS6 heads that have been worked. I also have the Fast 90/90 already which I will be putting on the motor. I'm eventually going to put either a Maggie or ProCharger on there also but not right now.
on the info you just gave, i will change my opinion to yes. upgrade to the larger header, have fun with it.
Old 01-30-2010, 08:52 AM
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Originally Posted by 98LS1auto
Its a weekend warrior. But will see some track time. Motor has a GT2-3 cam, LS6 heads that have been worked. I also have the Fast 90/90 already which I will be putting on the motor. I'm eventually going to put either a Maggie or ProCharger on there also but not right now.
I'm confused. Are you aksing about headers for the current motor or for the 383? Are you planning on using the GT2-3 cam with the 383? That is a very very small cam on a 383.

The 383 will benefit with the larger headers. Your current motor will likely only see slight gains above 5500 rpm and may lose low-end torque compared to the 1-3/4" headers.
Old 01-30-2010, 09:59 AM
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Originally Posted by 98LS1auto
Guys I have 1 3/4 Pacesetters on my car right now. I will be putting in a 383 in the near future. Would it be better if I go to 1 7/8 headers for the larger motor? Thanks.

i have pacesetters and i also have plans to do a 383. if i do go with the 383, i plan on running ARH 1 7/8 headers. so yeah, i would go with some 1 7/8 to get as much out of that setup as possible.
Old 01-31-2010, 12:37 AM
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Originally Posted by BAD2000TA
I'm confused. Are you aksing about headers for the current motor or for the 383? Are you planning on using the GT2-3 cam with the 383? That is a very very small cam on a 383.

The 383 will benefit with the larger headers. Your current motor will likely only see slight gains above 5500 rpm and may lose low-end torque compared to the 1-3/4" headers.
I'm talking about the 383. The motor I'm buying is set up for forced induction. That may be why the smaller cam is already installed. I know with FI you don't run as large a cam as with NA. But I'm no expert on this stuff. Maybe I should swap in another cam before I install the motor. I'll ask the guys in the FI section. What do you think?
Old 01-31-2010, 02:45 AM
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when you say "worked" heads what do u mean? ported? milled? hit with a sledge hammer?

it's hard to give you a good answer when you give vague discriptions.

if its just ls6 heads, low boost, and that small cam, i'de say the 1 7/8 headers are too expensive for the gains.

however if you are running stage III cnc ported ls6 heads, high boost, and a nasty cam then i would say yes 1 7/8 would be worth the extra green.
Old 01-31-2010, 06:51 AM
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Originally Posted by brian_rs/ss
when you say "worked" heads what do u mean? ported? milled? hit with a sledge hammer?

it's hard to give you a good answer when you give vague discriptions.

if its just ls6 heads, low boost, and that small cam, i'de say the 1 7/8 headers are too expensive for the gains.

however if you are running stage III cnc ported ls6 heads, high boost, and a nasty cam then i would say yes 1 7/8 would be worth the extra green.
They are Mallett ported heads with 67cc chambers, stainless valves. Don't know if that gives you enough info or not. If not I can try and find out more. Thanks.
Old 01-31-2010, 10:44 AM
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get the 1 7/8's. You'll see decent gains now and with cubes/blower its a no brainer.




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