Will my same set of headers work with Vortec heads?
#1
Member
Thread Starter
Join Date: Jan 2001
Location: Ft. Worth, TX
Posts: 436
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Turbo Trans Am and lots of non-3rd gens
Engine: 231 SFI Turbo's, LT4, LT1
Transmission: 2004r, 4L60E
Will my same set of headers work with Vortec heads?
I have a set of Doug Thorley headers that were on the stock TBI heads, and now they are on the Sportsman200s. Will these same headers work if I go to the cast Vortec heads?
*
I saw a post where the stock manifolds will not work because they use the second outer most hole on the rear but the headers use the inner most hole which is the only hole on the Vortecs, so I should be ok I think, but want to make sure.
Thanks
*
I saw a post where the stock manifolds will not work because they use the second outer most hole on the rear but the headers use the inner most hole which is the only hole on the Vortecs, so I should be ok I think, but want to make sure.
Thanks
#3
Member
Join Date: Jul 2001
Location: Houston, Texas, USA
Posts: 312
Likes: 0
Received 0 Likes
on
0 Posts
Hello, The bolt pattern is the same, but the exhaust port is about 1/8 inch higher on the vortec heads, so they wont line up the way they are-- You can elongate the holes downward in the header flange 1/8 inch- Now you can slide the header up the 1/8 inch on the head and tighten it down and you are lined up perfect. If you lay a vortec gasket over your headers you will see how far off they are. Later, Dave
#4
Member
Thread Starter
Join Date: Jan 2001
Location: Ft. Worth, TX
Posts: 436
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 Turbo Trans Am and lots of non-3rd gens
Engine: 231 SFI Turbo's, LT4, LT1
Transmission: 2004r, 4L60E
Thanks ya'll. I think I should be ok because the exhaust tubes on the Thorley's I have are a little bit bigger in diameter than the TBI exhaust ports were and currently the Sportsmans are "D" shaped ports and they work ok on them too.
#5
Dave you sure about this?? I had several sets of vortecs I sold and not noticed this the intake ports sure but the exhaust? I have a set in the garage I'll have to see how they match a set of 1 3/4" hooker longtubes ......
#6
Junior Member
Join Date: Apr 2004
Location: Williamsport PA
Posts: 29
Likes: 0
Received 0 Likes
on
0 Posts
Re: Will my same set of headers work with Vortec heads?
He is absolutely correct.. I ran into the same problem. I was never able to find an exhaust flange with the bolt holes corrected for vortec heads.. Luckily my buddy is skilled with auto-cad and has a connection to a machine shop with a water-jet.
I know that I've taked a picture that demonstrates this but I can't find it anywhere.
-Matt
I know that I've taked a picture that demonstrates this but I can't find it anywhere.
-Matt
Thread
Thread Starter
Forum
Replies
Last Post
84z96L31vortec
Tech / General Engine
7
08-20-2017 12:16 AM
L98GTA87
Engine/Drivetrain/Suspension Wanted
1
08-11-2015 06:55 PM
84z96L31vortec
North East Region
1
08-10-2015 08:27 PM