1 7/8" headers on a stock car?
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From: Broken Arrow, OK
1 7/8" headers on a stock car? ok well i've bought heads for my car and can't put them on for awhile, but i'm getting ready to buy headers and i want 1 7/8" headers for the heads but i want to put the headers on now...would 1 7/8" headers work ok on a stock H/C/I car?
yeah I put in the american racing headers 1-7/8" on my stock heads car. The driver side went in smooth but you have to remove the steering linkage, the passenger side wouldn't go past the k-member and that little flare in the bellhousing for the starter. so I had to grind down the k-member a little bit. It's close to the driver's side k-member too bolted on so it knocks on it once in a while but it's not bad. I just plan to get an aftermarket member soon though.
I got a question about the 7/8 headers. My friend brought up a point neither of us had considered, and I never see threads on it but figured I'd ask anyhow. You guys with mostly stock/stock internal cars, I measured an opening on a stock GM exhaust gasket and it's 1-3/4", which leads me to believe the head opening is the same. Having a 7/8" primary opening doesn't really cause an issue? Like I said, I've never seen a thread about it so I figure it's not but figured I'd also ask anyway. Furthermore, with ported heads, I know you can port match your intake, but is there such thing as port matching the exhaust side? If that's a stupid question I appologize, those seem to be the only ones I can come up with sometimes
/HIJACK OVER-J
not sure about porting the exhaust, don't think you can do it, but you can probably port the exhaust side of the heads to match the headers? Anyways 1-7/8 primaries with stock heads will lose some power and torque compared to the 1-3/4. but the headers are so expensive that if you plan on putting heads/cam or stroking the engine even if it's in a year or two it's cheaper just to buy the headers once. But if you're just going to put a medium to large cam and some smaller heads 1-3/4 is the best for you.
someone had a writeup when they went from 1-3/4 to 1-7/8. I guess when they pulled the old headers off they measured the exhaust ports and they were bigger than the 1-3/4 so the 1-7/8 gave them better performance for their heads. It all just depends what you plan on doing with the car
someone had a writeup when they went from 1-3/4 to 1-7/8. I guess when they pulled the old headers off they measured the exhaust ports and they were bigger than the 1-3/4 so the 1-7/8 gave them better performance for their heads. It all just depends what you plan on doing with the car
by using such a large primary tube header u r going to lose SO much down low. that size header shouldnt be used on anything making less than 600 horse. 1-3/4 would suit u just fine, the little bit of extra hps u pick up on the top end rnt going to be worth the 40ft lbs u lose on the low end, unless its a pure drag car that never sees below 4000 rpms
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First off I didn't want to open the 3/4 vs 7/8 CASE of worms camaroguy yea I meant porting the exhaust side of the head, should've specified. Thanks for the insight. What kind of cam did you put in? PM if you want to not clutter the thread
-J
camaroguy yea I meant porting the exhaust side of the head, should've specified. Thanks for the insight. What kind of cam did you put in? PM if you want to not clutter the thread -J
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Originally Posted by THEBRAD
by using such a large primary tube header u r going to lose SO much down low. that size header shouldnt be used on anything making less than 600 horse. 1-3/4 would suit u just fine, the little bit of extra hps u pick up on the top end rnt going to be worth the 40ft lbs u lose on the low end, unless its a pure drag car that never sees below 4000 rpms
Thats BS
BS is a bit harsh but he is exaggerating. You won't lose that much down low but you will lose some, the 1-3/4 will give you more for your current application but it's not that extreme.
I have the speed inc SI007 cam. It's kind of small but is a reverse split. 222 228 .588 lift with a 114.5 lsa. It gives a small lope but still smooth on the street, doesn't sound like it's going to die. I do plan on going bigger with a set of heads later on, and eventually swapping out motors for a 402 or bigger. That's why I chose these headers so I don't have to buy them twice. I would rather lose the power now then pay 1400 bucks twice.
I have the speed inc SI007 cam. It's kind of small but is a reverse split. 222 228 .588 lift with a 114.5 lsa. It gives a small lope but still smooth on the street, doesn't sound like it's going to die. I do plan on going bigger with a set of heads later on, and eventually swapping out motors for a 402 or bigger. That's why I chose these headers so I don't have to buy them twice. I would rather lose the power now then pay 1400 bucks twice.
Just get what ever you need for the future. If you know you are going bigger then there is nothing wrong with the stepped headers. And also like said before. It is a tad bit on the overkill side, but it will still work just fine.
I have 1 7/8 on my car now and its stock internal. I probably did loose a little midrange torque but its sure as hell not 40 ft lbs.. lol. I have the same lockup speeds with the LT's as I did before and the car pulls about the same at low RPMs in lock. obviously out of lockup the stall I have would do a good job of masking any lower rpm loss and at the track it flashes to just over 4K. I guess if you had an M6 you may be able to feel more a difference but with a good stall you won't notice a anything or show any loss at all. I got a good deal on the 1 7/8 Kooks I have and I might as well get the 1 7/8 because eventually I'd like to get a stroker motor for the car.
