Lower Intake Manifold - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

Thread Tools Search this Thread
Old 03-31-2010, 01:32 PM   #11
Senior Member
True Car Nut
xtremerevolution's Avatar
Join Date: Jun 2007
Location: New Lenox, IL
Posts: 2,478
Thanks: 0
Thanked 0 Times in 0 Posts
xtremerevolution is on a distinguished road

This is one of those things I paid VERY careful attention to when porting the LIM on my L27. After every slight bit of porting, I would put the LIM back on the engine and feel inside the ports for the edges of the heads to the edges of the LIM, then take it off and do more porting from there.
xtremerevolution is offline   Reply With Quote
Old 03-31-2010, 01:45 PM   #12

Expert Gearhead
BillBoost37's Avatar
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light

The ports to close are the coolant ports shown on this L67 manifold. In the case of the L36, they do not have the recessed area over them. Most people use a 1/4" NPT pipe plug that is headless to keep it flush. When I don't have those available, I clean, scuff up and then fill the UIM coolant passages. Does the same thing in the long run. Although the LIM plugs are preferred, then you don't need to drain coolant to remove the UIM.
Name:  IMG_5367.jpg
Views: 1
Size:  99.2 KB

And ... I gotta find the pics of the u bend hogging.
BillBoost37 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
FYI on lower intake manifold upgrade gaskets lunchboxx General GM Chat 17 02-01-2008 12:44 AM
Lower Intake Manifold Question 1999L36 General GM Chat 2 01-20-2008 08:37 AM
Series 1 Lower Intake Manifold gasket replacement. BobK 1992-1999 12 02-20-2007 01:20 AM
Series II lower intake manifold gasket vital49 1992-1999 3 05-22-2004 12:23 PM
97 SSE - LOWER intake manifold coolant leak j_ozolins 1992-1999 4 02-11-2004 11:53 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 06:01 PM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.