C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

LS2 engine help needed

Thread Tools
 
Search this Thread
 
Old Nov 7, 2016 | 03:11 PM
  #1  
afiterman's Avatar
afiterman
Thread Starter
Cruising
15 Year Member
 
Joined: Sep 2006
Posts: 14
Likes: 2
Default LS2 engine help needed

I have an LS2 installed in my '72 C3. The LS2 is out of an '05 stock corvette. I'm almost ready to fire this thing up but I have 2 questions for someone about the LS2 intake manifold.
1. In the front of the manifold, right in back of where the throttle body is attached, is an open port and I have no idea where or if this is connected to something. I've seen some images where its blocked off and some images where its connected but I can't tell where and to what. This is a non-emission engine so I'm not concerned about things like EGR and other related equipment. I've attached an image for reference.
2. In back is a brake booster vacuum port which I won't be using since I have a Hydroboost system which gets its pressure from the power steering pump. Could I use this vacuum port to open & close the wiper door? Any thoughts?? Thanks for any help!

Al
Attached Images  
Reply
Old Nov 8, 2016 | 08:05 AM
  #2  
Garys 68's Avatar
Garys 68
Melting Slicks
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Sep 2004
Posts: 2,655
Likes: 19
Default

Front port is either purge solenoid or PCV. No need for the purge, but set up your PCV.
Rear works fine for vacuum operated wiper/headlights.
Reply
Old Nov 10, 2016 | 07:26 AM
  #3  
afiterman's Avatar
afiterman
Thread Starter
Cruising
15 Year Member
 
Joined: Sep 2006
Posts: 14
Likes: 2
Default Thanks Gary

Very much appreciate your help Gary. Thanks.

Al
Reply
Old Nov 10, 2016 | 08:40 AM
  #4  
71 Vert LS1's Avatar
71 Vert LS1
Melting Slicks
Veteran: Army
15 Year Member
Top Answer: 1
Top Answer: 3
 
Joined: Sep 2010
Posts: 3,255
Likes: 687
Default

I typically cut the front port nipple off and then drill and tap for a bolt. Makes it look cleaner than a rubber cap over the top.
Reply
Old Nov 10, 2016 | 04:11 PM
  #5  
mikem350's Avatar
mikem350
Melting Slicks
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2006
Posts: 3,105
Likes: 96
From: Sunrise FL
Default

Make sure to use a PCV..it only helps!
Reply

Get notified of new replies

To LS2 engine help needed





All times are GMT -4. The time now is 12:28 AM.

story-0
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-1
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-2
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-3
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-4
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-5
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-6
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-7
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-8
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-9
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE