Percys #66012 that claim to be "1.5" are 1 5/8"
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Percys #66012 that claim to be "1.5" are 1 5/8"
http://www.jegs.com/i/Percys/760/66012/10001/-1
Just bought them from (brace your selves...) Vato-zone!
I measure them and they are on the edge at 1 5/8".
"What does this mean", you ask?
That we (stock port/heads) can use them.
Just bought them from (brace your selves...) Vato-zone!

I measure them and they are on the edge at 1 5/8".
"What does this mean", you ask?
That we (stock port/heads) can use them.
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Joined: Apr 2010
Posts: 1,027
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
http://www.jegs.com/i/Percys/760/66012/10001/-1
Just bought them from (brace your selves...) Vato-zone!
I measure them and they are on the edge at 1 5/8".
"What does this mean", you ask?
That we (stock port/heads) can use them.

Just bought them from (brace your selves...) Vato-zone!

I measure them and they are on the edge at 1 5/8".
"What does this mean", you ask?
That we (stock port/heads) can use them.
Thread Starter
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Make sure you either get Long tubes or Dyno Dons shorties.
I had those 2055s and I didn't even feel a gain.
-"...a waist of time and money."
I had those 2055s and I didn't even feel a gain.
-"...a waist of time and money."
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Joined: Apr 2010
Posts: 1,027
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From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
you either did something wrong in your installation, or you didnt have hookers 2055, probably 2460 or what ever the cheaper hooker counterpart they have. Everyone on here loves them and combo'd with a good catback, leaves people happy. 1-3/4 header primary's are just a little overkill on my car (anything with less than 350HP at that) i dont need that much piping. My motor is a bottom end motor, not top.
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
you either did something wrong in your installation, or you didnt have hookers 2055, probably 2460 or what ever the cheaper hooker counterpart they have. Everyone on here loves them and combo'd with a good catback, leaves people happy. 1-3/4 header primary's are just a little overkill on my car (anything with less than 350HP at that) i dont need that much piping. My motor is a bottom end motor, not top.
When you want to make some power and run a good number you will will throw them away, or in my case sell them to another 3rdgen guy.
Let me ask you this, you say your motor is a bottom end motor. So how long is a motor at WOT going to stay in the lower rpms when they are in fact increasing...
rhetorical question
-and il leave it at that
Last edited by no new tires; Mar 17, 2014 at 12:08 PM.
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Joined: Apr 2010
Posts: 1,027
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Nothing was wrong, yes I did have 2055, 8/10 ppl on here are cueless and don't make any power in the first place and they are just happy to have gotten them on.
When you want to make some power and run a good number you will will throw them away, or in my case sell them to another 3rdgen guy.
Let me ask you this, you say your motor is a bottom end motor. So how long is a motor at WOT going to stay in the lower rpms when they are in fact increasing...
rhetorical question
-and il leave it at that
When you want to make some power and run a good number you will will throw them away, or in my case sell them to another 3rdgen guy.
Let me ask you this, you say your motor is a bottom end motor. So how long is a motor at WOT going to stay in the lower rpms when they are in fact increasing...
rhetorical question
-and il leave it at that
That was the dumbest question in the world. Roflmao. Whether rpms are increasing or not, if your build allows up to 5500rpm, I don't see how missmatching some longtube headers to my heads,cam&intake combo will help me out, where I need it. I never rev passed 5k if that.
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
I first joined here in 2005, this account is new.
Anyways iv een in this for a long time and have been threw enough 3rdge stuff to know what works and what doesn't. Why don't you go and ask Dyno Don himself what he thinks about 2055. Hes made good money on making a product thats better than that junk and it fits better too. Go look at that 2055 Y-pipe too while your at it...
I spent -LESS- money buying used and coated LTs and a Mufflex Y-pipe, than I did spending $700+on that 2055 junk kit. The fact that you would even think about shorties shows that you havn't been doing this half as long as I have.
Lets agree to disagree since im out in front with my set up which is all that really matters.
Anyways iv een in this for a long time and have been threw enough 3rdge stuff to know what works and what doesn't. Why don't you go and ask Dyno Don himself what he thinks about 2055. Hes made good money on making a product thats better than that junk and it fits better too. Go look at that 2055 Y-pipe too while your at it...
I spent -LESS- money buying used and coated LTs and a Mufflex Y-pipe, than I did spending $700+on that 2055 junk kit. The fact that you would even think about shorties shows that you havn't been doing this half as long as I have.
Lets agree to disagree since im out in front with my set up which is all that really matters.
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Joined: Apr 2010
Posts: 1,027
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
I was in contact with dyno don, but if he can barley answer my questions through pm with out acting like I'm the biggest waste of his time (when hes going to be making cash off me) than I know how communication will be when I purchase something from him. Which is why I didn't. Of course a creator of another item is going to want me to NOT purchase his competition.
What you know more because of your build?(which you still didn't say what build didn't go well with these headers) if I have a motor built for low end, what's wrong with me purchasing a item that goes well with ny combo? Yeah you probably have the money to make a high rpm build, congrats I don't.
Congrats on your used items.
I don't get it what's with the new login then.
What you know more because of your build?(which you still didn't say what build didn't go well with these headers) if I have a motor built for low end, what's wrong with me purchasing a item that goes well with ny combo? Yeah you probably have the money to make a high rpm build, congrats I don't.
Congrats on your used items.
I don't get it what's with the new login then.
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
I was in contact with dyno don, but if he can barley answer my questions through pm with out acting like I'm the biggest waste of his time (when hes going to be making cash off me) than I know how communication will be when I purchase something from him. Which is why I didn't. Of course a creator of another item is going to want me to NOT purchase his competition.
What you know more because of your build?(which you still didn't say what build didn't go well with these headers) if I have a motor built for low end, what's wrong with me purchasing a item that goes well with ny combo? Yeah you probably have the money to make a high rpm build, congrats I don't.
Congrats on your used items.
I don't get it what's with the new login then.
What you know more because of your build?(which you still didn't say what build didn't go well with these headers) if I have a motor built for low end, what's wrong with me purchasing a item that goes well with ny combo? Yeah you probably have the money to make a high rpm build, congrats I don't.
Congrats on your used items.
I don't get it what's with the new login then.
1.
Don's shorties have been proven under the gavel to be -THEE BEST- and -ONLY- "REAL" shortie option out their.
Above them are all LONG TUBE headers. Which benefit -LOW END POWER- due to better exhaust scavenging.
(did you see what I did their?)
2. I work for a living...I dont have money either..which is why I drive said IROC-Z back and forth everyday. (no A/C no heat and NO speakers)
3. Im doing a Procharger setup.

4. Don't worrie about that last thing...
P.S My buddies who'e been doing 3rds since the EARLY 90's, told me not to get 2055 but to get LTs. I said no, im not building a killer, dragged my feet, just wanted a bolt in setup, this that and the other. Did I listen? NO, instead I spent $700+ on that junk kit with that retarded, non properly fitting Y-pipe with its soft ball sized spot where the coating was "not right".
Needless to say I had them for about a year, then I sold them after I found some body selling some used coated LTs for a darn good price.
(which is what I needed to get into Lts) I also bought a Mufflex Y-pipe
(yes it cost money and yes you WILL need a mini starter, and yes they sound cool.)
(no I did't have to jack the motor/take mounts loose/ or mess with the trans - old and worn out saggy motor mounts)
I forget where im at on this but the moral is GO BIG OR GO HOME.
ow and next time your at the track or where ever, look at how many ppl are running LTs...it will be EVERY modded car their.
im gona wrap this up because im hungry and pizza is calling my name but you take care now, and remember - some one told you directly so that you won't make the same mistake by not taking the advise from some one who has "been their done that."
-all right its eaten time - OUT
Last edited by no new tires; Mar 17, 2014 at 03:25 PM.
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Joined: Apr 2010
Posts: 1,027
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Wow you have a LOT of time to make a great response, but still no details on the so called "build" that the 2055's didnt work well with.
Theres obviously a reason you dont have your old login.... Im just going to leave it at that
Theres obviously a reason you dont have your old login.... Im just going to leave it at that
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Joined: Apr 2010
Posts: 1,027
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
P.s 'unfortunately' for me the 2055's are sitting on my carpet in my room.
Im just wondering how you say you didnt get any gain from them. If when i through these Cheapo Jeg's "tubular" headers , and had a new crappy cobbled up exhaust system ran for me on my car and i felt a gain from that crap, i know for a fact i'll gain more from this, and a nice Cat back.
Im just wondering how you say you didnt get any gain from them. If when i through these Cheapo Jeg's "tubular" headers , and had a new crappy cobbled up exhaust system ran for me on my car and i felt a gain from that crap, i know for a fact i'll gain more from this, and a nice Cat back.
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Their was no setup.
2.
2.
Joined: Mar 2000
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Here's your answer...
But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html
But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html
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From: Spring Hill, Fl.
Car: 87 iroc-z
Engine: 454
Transmission: th350
Axle/Gears: 3.73
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
wow!
i dont think i've ever seen an outlet that small before?
theres no way i would put those on any car.
you'd be better off with stock manifolds.
i dont think i've ever seen an outlet that small before?
theres no way i would put those on any car.
you'd be better off with stock manifolds.
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Supreme Member


Joined: Apr 2010
Posts: 1,027
Likes: 11
From: Modesto, California
Car: 88 Firebird Formula
Engine: LO5 5.7 TBI/Ebl Flash
Transmission: 700R4
Axle/Gears: 2.73 stock rear end
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
lol, lets end civilized thanks for the help with the gaskets and if i end up being pissed about not going with LT's, i'll post a thread in your dedication
But really though, dont want to end on a bad note, your probably right about long tubes, but i just dont have the cash or means to do it as of right now. I really ended up grabbing these because of the CARB stamp..... lol
Everyone knows to open them up.
Dont judge a book by its cover.
But really though, dont want to end on a bad note, your probably right about long tubes, but i just dont have the cash or means to do it as of right now. I really ended up grabbing these because of the CARB stamp..... lol

Here's your answer...
But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html

But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html

Dont judge a book by its cover.
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
How in the world are those considered an upgrade from the 2460s? They at least have the standard 3" collectors, even if the primaries are 1-5/8. Thread Starter
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Joined: Mar 2014
Posts: 571
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From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Oww....you didn't say you lived in limp wristed smog **** cali........shorties for you.
Open exhaust (BIG leak...) LTs/mufflex in corn INDY for me.
Neither are 3"....
Open exhaust (BIG leak...) LTs/mufflex in corn INDY for me.
Neither are 3"....
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Summit Racing Part Number:HOK-2460-1HKR
UPC:700414050577
Header Style:Shorty
Header Material:Steel
Header Finish:Silver ceramic coated
Weld-Up:No
Primary Tube Diameter (in):1 5/8 in.
Collector Attachment:3-bolt flange
Collector Diameter:3.000 in.
Cylinder Head Port Shape:Oval
Tuned:No
Primary Tube Gauge:16-gauge
It's the Y-pipe that necks down to 2.5", but the headers themselves have 3'' collectors
UPC:700414050577
Header Style:Shorty
Header Material:Steel
Header Finish:Silver ceramic coated
Weld-Up:No
Primary Tube Diameter (in):1 5/8 in.
Collector Attachment:3-bolt flange
Collector Diameter:3.000 in.
Cylinder Head Port Shape:Oval
Tuned:No
Primary Tube Gauge:16-gauge
It's the Y-pipe that necks down to 2.5", but the headers themselves have 3'' collectors
Joined: Oct 2001
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From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Here's your answer...
But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html

But you don't need anyone to tell you.....
https://www.thirdgen.org/forums/post...379-post3.html

I'm building 1 7/8ths to 2" step long tube headers for my junk. Its way over 500 hp.
My "more of a" street car will be getting a set of Dyno Dons.
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Joined: Mar 2014
Posts: 571
Likes: 10
From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
Echoing my own words does nothing. I have the 2460s. I begged a certain member here to make up a 3' intermediate for me, but he had no interest in doing so. He since has started to. I chased every exhaust shop within 50 miles for a month and no one will touch a 3" exhaust on these cars. I broke down and got the Doug's D901 Y and a 2-1/2" intermediate. The car is not even on the road yet after 3 years into this project. Should be done within the month. It has an exhaust on it now at least. The plan is to eventually cut off at the Y and 3" out from there. First things first, get the blasted thing on the road. The whole project has wore me out mentally, physically and financially. Not necessarily in that order.
Last edited by Joe Tag; Mar 17, 2014 at 09:29 PM.
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Joined: Mar 2014
Posts: 571
Likes: 10
From: Indy
Car: 88 IROC-Z
Engine: GEN 4 LY6 (going forged 408)
Transmission: 60E (going RPM LEVEL 6 4L80E)
Axle/Gears: 7.5" 3.42 (staying...)
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
LTs and you could just not run a Y. Or run them open till you get the money?
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Joined: Jul 2001
Posts: 5,225
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From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Re: Percys #66012 that claim to be "1.5" are 1 5/8"
I'm certainly not saying 2055's are the best. But you are not better off with stock manifolds. I went 14.8@93mph bone stock with 2.77's. 14.4@96mph with hooker 2055's and there y pipe. Then 14.0@98mph with a 3" catback and a powerstick muffler. Along with bumped up timing and fp.
Last edited by IROCThe5.7L; Mar 18, 2014 at 02:25 AM.
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Car: 92 rs z28 clone
Engine: forged 350
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Re: Percys #66012 that claim to be "1.5" are 1 5/8"
well just to let everyone know you can make good power on some of the cheapest headers out there like the ones I had on my old set up they were flow tech 1 1/2" primaries and 2 1/2 collectors I have a real build now and using 1 3/4" lt headers here is a good article just to show the different in headers sizes and what not.
http://www.chevyhiperformance.com/te...t/viewall.html
http://www.chevyhiperformance.com/te...t/viewall.html
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