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Long tube headers

 
Old 02-13-2019, 06:22 PM
  #61  
tdereggi
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AKIM,

I agree with you. I think the TPIS are the best fitting Headers on the market for C4. If I did it again, I'd use TPIS again.
(actually if I did it again, I'd go Dual Turbos, and use a custom manifold that fit the turbos :-)

For 84-89, The TPIS is the only header that can be installed without welding, and interface to stock connector types.
That's a big plus for people who need to keep emmission stuff installed and functioning ongoing.
For example to replace a CAT. Easy bolt off Ypipe when need to remove the trans. Easy access to starter.
The extra part cost of TPIS (about $500 more) is worth every penny, for the average person.

The reason I said that some people can save with OBX, (a lower $500 parts cost) is that some people know how to weld, and have fabbing skills. They might actually enjoy the custom work. Its really about the price that someone puts on their time.

Regarding bolt/plug fitment. The issue is only with the two inner pipes on passenger side. 3rd back melts the wire. 2nd back limits access to fit socket over plug with wrench attached. Full size plug can still be used, it was just easier for me to use the Accel shorty plug. Regarding dimpling two pipes, the issue exists because the 1-3/4" dia pipe is wider than stock, and the stock nuts are type shaped like a washer is welded to the nut. The washer part rubs against the pipe, for two pipes. The easiest fix, is to use aftermarket thinner nuts, without the washer flanges, that people typically use for headers, for those two pipes.
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Old 02-13-2019, 07:03 PM
  #62  
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Yeah, the Tpis headers are the best fitting or hooker from what Iíve heard. I would get those if they were close to the same but Iím not spending $800 on them. I think all youíd need with the phab ones are some spacers so the brackets are right and then weld a flange to the pipes of the exhaust because thereís already a flange on the phab headers. I will be letting everyone know how the shop says the install goes and I will get pictures when they come here.
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Old 02-13-2019, 10:28 PM
  #63  
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Originally Posted by tdereggi View Post
Its really about the price that someone puts on their time.

Regarding bolt/plug fitment. The issue is only with the two inner pipes on passenger side. 3rd back melts the wire. 2nd back limits access to fit socket over plug with wrench attached. Full size plug can still be used, it was just easier for me to use the Accel shorty plug. Regarding dimpling two pipes, the issue exists because the 1-3/4" dia pipe is wider than stock, and the stock nuts are type shaped like a washer is welded to the nut. The washer part rubs against the pipe, for two pipes. The easiest fix, is to use aftermarket thinner nuts, without the washer flanges, that people typically use for headers, for those two pipes.
I guess that is what it boils down to. What is YOUR time worth, assuming you can do the job because you have mad welding skills and the equipment. I also don't think I found much more for the 90-91 years where I could assemble it myself or without too much work.

Interesting. I think that was done back 15 years ago so I might be fuzzy on some details since I had a mechanic do some of the work. I didn't want to install a motor all by my lonesome with a cherry picker in my garage so I hired him to do the motor install. Didn't want to risk the motor being lowered onto the headers so we had him put the motor in and start with the accessories on one side while I installed the other side. I suspect that the AFR heads I used had something to do with the fitment? Maybe?
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Old Yesterday, 01:25 PM
  #64  
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"I suspect that the AFR heads I used had something to do with the fitment? Maybe?"

Or maybe, when the AFR heads were installed, the installer decided to use new proper fitting bolts/nuts?

Actually, I just relooked at headers, and I need to correct my comments..
The burned boot issue was because the Accel wire sets I used originally provided 1 straight boot for the 3rd pass side plug, while all other 7 were angled.
That was correct for stock manifold, not for headers. Eventually, I corrected the problem by switching to an Angled boot on plug3 also, and that fit nicely.
Also, the tight plug clearance was that same plug 3, the 2nd back plug clearance was fine.
Id also argue the clearance to that plug is pretty tight with the stock manifold also.
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Old Yesterday, 01:26 PM
  #65  
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Old Yesterday, 04:03 PM
  #66  
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Originally Posted by tdereggi View Post
Or maybe, when the AFR heads were installed, the installer decided to use new proper fitting bolts/nuts?

Actually, I just relooked at headers, and I need to correct my comments..
The burned boot issue was because the Accel wire sets I used originally provided 1 straight boot for the 3rd pass side plug, while all other 7 were angled.
That was correct for stock manifold, not for headers. Eventually, I corrected the problem by switching to an Angled boot on plug3 also, and that fit nicely.
Also, the tight plug clearance was that same plug 3, the 2nd back plug clearance was fine.
Id also argue the clearance to that plug is pretty tight with the stock manifold also.
I thought I used stock sized bolts from ARP? Been a while so I can't remember. I thought I either used stock or stock sized since I didn't recall cursing and swearing while running up and down to the hardware store.

I see, I used all 90 degree boots from MSD that were "universal" so everything was cut to length. Ran it along the valve cover bolts with retainers to keep them in place. This is with centerbolt VC.
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Old Yesterday, 07:10 PM
  #67  
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Originally Posted by aklim View Post
I thought I used stock sized bolts from ARP? Been a while so I can't remember. I thought I either used stock or stock sized since I didn't recall cursing and swearing while running up and down to the hardware store.

I see, I used all 90 degree boots from MSD that were "universal" so everything was cut to length. Ran it along the valve cover bolts with retainers to keep them in place. This is with centerbolt VC.
There is something goofy about the flanges on AFR heads. My AFR 210s didn't line up to a few different sets of headers (including SLP) without working the bolt holes a little. The ports are raised, but the actual bolt spacing is a little goofy.

The same headers bolted up to Vortec heads I had in the shop no issue. Go figure.

I've never run TPIS headers or actually had a set in my possession. Are they stainless like the SLP headers were?

-- Joe
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Old Yesterday, 07:52 PM
  #68  
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regarding TPIS, not sure what type metal is undernieth, but the finish is.... " baked-on metallic-ceramic coating".
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Old Today, 02:42 PM
  #69  
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Originally Posted by anesthes View Post
There is something goofy about the flanges on AFR heads. My AFR 210s didn't line up to a few different sets of headers (including SLP) without working the bolt holes a little. The ports are raised, but the actual bolt spacing is a little goofy.

The same headers bolted up to Vortec heads I had in the shop no issue. Go figure.

I've never run TPIS headers or actually had a set in my possession. Are they stainless like the SLP headers were?

-- Joe
I had AFR 190 so not sure why the 210 doesn't fit. Maybe someone screwed up? They fit the Accel Tri-Y headers in my F-body and definitely the C4 ones. I had Tri-Y and some cheap crap (Hooker maybe?) in my F-body. It fits my motor trashing TFS heads and now the AFR 190 heads.

I am not sure of the material but it was ceramic coated or something that was supposed to be more heat resistant. Supposedly it would contain more of the heat in the tubes. My only specifications were as follows:

1. Performance
2. Durability
3. Easy to install and work around

It isn't shiny at all so probably not it has to look good.

Last edited by aklim; Today at 02:56 PM.
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