C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Dec 15, 2016 | 02:30 PM
  #21  
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1-5/8 tube is plenty for a 350 if that helps you decide you dont need larger unless youre really making some steam and running the rpm up
Everyone wants to believe they need them. Wont hurt to use them just not criticial is all Im saying

On headers yeah good stuff costs and never buy the cheapest but far as headers go C4s arent very complex in comparison to most. 1600 is a rip.
Ones I have on my Abody are equal length, coated were in the 5xx range def more work to manufacture. Corvette tax, wont pay it.
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Old Dec 15, 2016 | 07:09 PM
  #22  
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I dont think they are a new company or are making a new product, hows about they are so cheap because they have been sitting so long and as every one keeps stating c4s are a shrinking market. as an example I have a chevy HHR, very limited out of production vehicle. when i bought it in 2008 a borla stainless exhaust was $1400 , I can now pick it up for $450 from borla. sitting so long big close out deals. just some thoughts. I finished up headers today, just have to wire up the heated o2 sensor and ill let everyone know how they are.




Originally Posted by cuisinartvette
1-5/8 tube is plenty for a 350 if that helps you decide you dont need larger unless youre really making some steam and running the rpm up
Everyone wants to believe they need them. Wont hurt to use them just not criticial is all Im saying

On headers yeah good stuff costs and never buy the cheapest but far as headers go C4s arent very complex in comparison to most. 1600 is a rip.
Ones I have on my Abody are equal length, coated were in the 5xx range def more work to manufacture. Corvette tax, wont pay it.
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Old Dec 15, 2016 | 07:11 PM
  #23  
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Originally Posted by steven mack
Well I hope they get more stock in.Thanks
Looks like they are still out there to me. Look for this on the bay...

"Maximizer Exhaust Manifold Header 85-91 Chevy Corvette C4 L98 with Y-pipe"

Inside the auction, you'll see 1.7" OD.
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Old Dec 15, 2016 | 07:26 PM
  #24  
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My obx headers. Primary tube measurement.


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Old Dec 21, 2016 | 01:36 AM
  #25  
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Finally got to drive the vette today after the snow we had in ny, all I have to say is wow what a difference, I realize that with the miniram and cam that I'm probably seeing more gains than I would if the motor was stock with this header install, but if you've read some of my previous posts months ago about never being impressed with headers on all my musclecars I've built, im impressed. im also sure this proves how bad the original shorty headers really are. car doesn't actually feel that much faster but im spinning the tires at will. a 30mph roll in first and tires go up in smoke, I spin them into second and chirp third, drag radials here I come. one thing I will have to say is that (don't know how to say it) is that it definitely makes it less civilized. not that its that much louder, but it took the luxury out of the car and turned it into an older less refined car. definitely more brutish.


Originally Posted by Dt86
My obx headers. Primary tube measurement.


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Old Dec 21, 2016 | 09:13 AM
  #26  
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Originally Posted by zapc
Finally got to drive the vette today after the snow we had in ny, all I have to say is wow what a difference, I realize that with the miniram and cam that I'm probably seeing more gains than I would if the motor was stock with this header install, but if you've read some of my previous posts months ago about never being impressed with headers on all my musclecars I've built, im impressed. im also sure this proves how bad the original shorty headers really are. car doesn't actually feel that much faster but im spinning the tires at will. a 30mph roll in first and tires go up in smoke, I spin them into second and chirp third, drag radials here I come. one thing I will have to say is that (don't know how to say it) is that it definitely makes it less civilized. not that its that much louder, but it took the luxury out of the car and turned it into an older less refined car. definitely more brutish.
Is the chip optimized for all that?
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Old Dec 22, 2016 | 12:41 AM
  #27  
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yes, if you follow my other threads I recently purchased an ostrich and been learning how to tune. I just now have been playing with E85, I'm just about maxxed out on my injectors and fuel pressure but im running rich enough for now. will have to do larger injectors and a new fuel pump if I decide to stay with the E85. any E85 experts out there?

Originally Posted by aklim
Is the chip optimized for all that?
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Old Dec 26, 2016 | 11:47 AM
  #28  
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Bought a set of OBX's for my 85 vette, $370 with y pipe. Well built fit excellent, even with angle plug heads. Removed the stock collectors, installed Cone Engineering merge collectors. 383, small roller cam, single plane intake with 34 lb injectors, 1000 cfm throttle body, dual cats, x pipe. Made 356 rwhp on the dyno. Oh yeah, 700-4r trans and, at the time stock rear gears.
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Old Dec 26, 2016 | 11:57 AM
  #29  
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Do you think there is room for straight plug heads?Thanks,Steve
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Old Dec 26, 2016 | 12:30 PM
  #30  
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Originally Posted by steven mack
Do you think there is room for straight plug heads?Thanks,Steve
Angle plug headers on a straight plug head will (usually) require a pry bar, a hammer & dolly, beer and a lot of frustration. Even aftermarket angle plug heads don't seem to be the same angle as stock heads. Don't let this scare you away from headers, just go into it ready to mod them.
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Old Dec 26, 2016 | 12:47 PM
  #31  
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Originally Posted by Benny42
Angle plug headers on a straight plug head will (usually) require a pry bar, a hammer & dolly, beer and a lot of frustration. Even aftermarket angle plug heads don't seem to be the same angle as stock heads. Don't let this scare you away from headers, just go into it ready to mod them.
Would it not be best match the head to header instead trying to shoehorn it into working by banging, cutting, swearing, getting drunk, virgin sacrifice, etc? I have see people splice pipe, heat bend, etc but why, unless you are forced to? I like to take the easy way out. If I had to do that work, I'd commission someone to build it or it myself rather than to shoehorn it into submission
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Old Dec 26, 2016 | 01:02 PM
  #32  
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Originally Posted by aklim
Would it not be best match the head to header instead trying to shoehorn it into working by banging, cutting, swearing, getting drunk, virgin sacrifice, etc? I have see people splice pipe, heat bend, etc but why, unless you are forced to? I like to take the easy way out. If I had to do that work, I'd commission someone to build it or it myself rather than to shoehorn it into submission
I guess the sarcasm of my comment was lost in the typing. You seem to have gotten my point and reworded it. I have done it, i just don't highly recommend it.
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Old Dec 26, 2016 | 01:06 PM
  #33  
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Originally Posted by Benny42
I guess the sarcasm of my comment was lost in the typing. You seem to have gotten my point and reworded it. I have done it, i just don't highly recommend it.
My bad. Sarcasm doesn't always come across well on the screen. Would you say that your experience is like getting drunk and waking up to someone who was coyote ugly? Did it before but don't highly recommend it? Lol
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