Go Back   LS1TECH > SBC-BBC-LT1-LT4 PERFORMANCE > LT1-LT4 Modifications
Sign in using an external account
Register Forgot Password?
Search

LT1-LT4 Modifications
1993-97 Gen II Small Block V8

Welcome to LS1Tech.com!
Welcome to LS1Tech.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join LS1Tech.com today!


Reply
 
Thread Tools Search this Thread
Old 06-21-2012, 03:13 PM   #1
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default Intake manifold oil leak.....any advice?

So I'm on my 2nd LT1 and just my luck, my brand new 383 has the classic LT1 rear intake manifold oil leak This is not my first time dealing with this as my old LT1 did the same thing until we pulled the intake and replaced the gaskets/rtv. I'm planning on pulling the intake and putting in new gaskets this weekend. Are there any helpful tips/suggestions to ensure it does not leak again Or is it just a hit or miss type deal?
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-21-2012, 03:17 PM   #2
BTC
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2007
Location: Lansing, MI via Bowling Green, KY, Dalton GA, Nashville, TN & Atlanta, GA
Posts: 1,282
Default

Arc welding?
__________________
Bill

'94 M6 Z28 That's Been Sitting For 11 Years, Coated Kooks 1 3/4" Race Headers, Kooks ORY, GMMG Exhaust, MSD 8.5 Wires, TB Bypass, !AIR, !EGR
BTC is offline   Reply With Quote
Old 06-21-2012, 03:27 PM   #3
TECH Veteran
Garage is empty, add now
 
wrd1972's Avatar
 
Trader Rating: 12
Join Date: Mar 2006
Location: Central Kentucky
Posts: 4,521
Default

Just use the RIGHT STUFF RTV.
Done.
__________________
1995 Z28 Convertible, M6 355ci LT1 DYNO 394 RWHP/370 RWTQ SAE thru the 9" Truetrac
Performance Mods 6" rod Mahle pistons, LE2 heads w/ Patriot xtremes, 226/232 LE cam, LE ported intake, Midwest 9" w/4.11's, K&N CAI, BBK 58MM TB, LPP Long tube headers no cats, Pro mag 1.6 RR's, Tuned by BLUECAT.Pic top down. Pic top up. Pics of my True Dual exhaust.
wrd1972 is offline   Reply With Quote
Old 06-21-2012, 03:31 PM   #4
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default

Quote:
Originally Posted by BTC View Post
Arc welding?
lol good idea
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-21-2012, 03:42 PM   #5
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default

Quote:
Originally Posted by wrd1972 View Post
Just use the RIGHT STUFF RTV.
Done.
Last time I used Permatex "ultra black" gasket maker.....is "Right Stuff" a better formula RTV or something?
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-21-2012, 03:48 PM   #6
TECH Enthusiast
Garage is empty, add now
 
Z28Roxy's Avatar
 
Trader Rating: 4
Join Date: Mar 2007
Location: Waukesha, WI
Posts: 717
Default

Quote:
Originally Posted by wrd1972 View Post
Just use the RIGHT STUFF RTV.
Done.

Quote:
Originally Posted by ahritchie View Post
Last time I used Permatex "ultra black" gasket maker.....is "Right Stuff" a better formula RTV or something?
Yes. I used the right stuff and mine never leaked after.
__________________
1995 Patriot Red Camaro Z28
CAI, Pacesetter LTs, True duals x-pipe/borla XR1s, Dana S60, BMR rear suspension/kmember, 1.25" drop, Meziere HD EWP, 315 nittos.
Lunati/Wiseco Forged 383 CC 218/230 Trickflow heads
Red 1995 Z28. (winter beater/DD). Stock
Z28Roxy is offline   Reply With Quote
Old 06-21-2012, 06:21 PM   #7
TECH Senior Member
Garage is empty, add now
 
RamAir95TA's Avatar
 
Trader Rating: 2
Join Date: May 2005
Location: South Jersey
Posts: 9,488
Send a message via AIM to RamAir95TA
Default

I've always used Ultra Black but next time I might give The Right Stuff a shot. Seems to be pretty popular nowadays.
__________________
95 T/A AI 200cc stock castings, 383, Performabuilt 4L60E, Ford 9", Tuned by PCMforless 3340#,
10.81 @ 124.16, 1.43 60' Video of 10-second pass 455whp, 445tq - Dyno Vid

LT1 PARTS For Sale, MSD Opti, steam crossover tube, BMR swaybar, MAF, etc.
RamAir95TA is offline   Reply With Quote
Old 06-21-2012, 06:56 PM   #8
TECH Junkie
Garage is empty, add now
 
Trader Rating: 28
Join Date: Feb 2007
Location: Hawaii
Posts: 3,766
Send a message via AIM to whytryz28
Default

Quote:
Originally Posted by RamAir95TA View Post
I've always used Ultra Black but next time I might give The Right Stuff a shot. Seems to be pretty popular nowadays.
This stuff is close to impossible to get off once it dries. Have to cut it off then sand it down.
whytryz28 is offline   Reply With Quote
Old 06-21-2012, 08:48 PM   #9
TECH Apprentice
Garage is empty, add now
 
Trader Rating: 1
Join Date: Dec 2010
Location: Ocala Florida
Posts: 380
Default

I used the ultra copper RTV and haven't had a problem yet.
__________________
1995 TA LT1 M6
1986 Monte Carlo SS 540 BBC
1998 Dodge Ram 1500
1997 Ford Expedition
2002 GSXR 750
SilverSS07 is offline   Reply With Quote
Old 06-21-2012, 09:25 PM   #10
TECH Fanatic
Garage is empty, add now
 
defaultexistence's Avatar
 
Trader Rating: 11
Join Date: Sep 2005
Location: fort walton beach,fl
Posts: 1,957
Send a message via Yahoo to defaultexistence
Default

Ultra grey by permatex (reccomended by Lloyd elliott) , make a bead front and back, let it get tacky,set intake straight down,torque, let sit over night, retorque, after a week retorque.. Best results IMO
__________________
Listing mods in your sig is lame especally free mods, NO Body cares that you deleted your EGR.
My 93 383 T/A Feasts on the oil of cars it beats in races, gains their horsepower and craps Imports.
defaultexistence is offline   Reply With Quote
Old 06-21-2012, 09:37 PM   #11
TECH Fanatic
Garage is empty, add now
 
nitrous2fast's Avatar
 
Trader Rating: 2
Join Date: Dec 2010
Location: Oklahoma
Posts: 1,054
Default

The right way to make it not leak is to put the manifold on and see how high the sealant needs to be to make a seal. Not all manifolds have the same size gap to fill. Any kind of change to the heads/intake/deck will make the size change.
nitrous2fast is offline   Reply With Quote
Old 06-22-2012, 08:13 AM   #12
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default

Good suggestions here....will try "test fitting" the intake and see how big a gap there is and re-torquing the bolts overnight and maybe a week later; I don't think I did that last time.
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-22-2012, 11:32 AM   #13
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 0
Join Date: Apr 2008
Posts: 1,816
Default

FWIW I have always used the black "ultra" RTV. Surface mating and really cleaning it are important so as suggested confirm the intake manifold sits right. On 383 builds the heads, block have been machined and this effects how the intake manifold sits.

also let the rtv cure overnight before starting motor
__________________
'96 BBB
383/T56
BALLSS is offline   Reply With Quote
Old 06-22-2012, 02:47 PM   #14
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 18
Join Date: Aug 2007
Location: Navy Base San Diego CA
Posts: 1,917
Default

Clean the surfaces real well and set the manifold straight down on the bolt holes. Dont let it move around. Its nice to have another person there to help set it in place. Torque it down and Let it dry over night. I run the sealant up on the head about an inch to where it overlaps the actual intake gasket.

Ive used the permatex copper and just the normal black stuff with good luck. no leaks.
__________________
LT4 Hotcam kit, LS1 Lid, 6 Speed, Competition Clutch 2.5, UMI suspension, LT Headers, Magnaflow Catback
Badazz 97 TA is offline   Reply With Quote
Old 06-25-2012, 08:30 AM   #15
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default Wtf!

I'm about to burn this car to the ground After pulling the intake TWICE this weekend I STILL have an oil leak. I do know however the causes of failure of a couple intake leaks though; the first time Saturday me and my mechanic friend pulled the intake, after scraping the old RTV off the back, there was damn plastic tape of some sort taped to the edge of the block where the intake seals to it...maybe the engine builder left it WTF So the oil was leaking under the tape/RTV.

Then, once we were ready to put the intake back on with new RTV, I was fumbling get the wiring harness, and EGR pipe out of the way my finger touched the fresh RTV....I told my buddy we need to pull the intake back out and re-check the bead because I touched it...he assures me he put a BIG bead of "Right stuff" and not worry....LMAO...MISTAKE.

So we pulled it again (taking only 2 hrs this time lol) and CAREFULLY placed the intake down after pulling the whole wiring harness out of the way.

Today I had two small oil puddles on my driveway I put my hand on the back of the motor and felt the oil pressure sensor fitting the sensor screws into is coated in fresh oil....I did replace the oil pressure sensor a couple weeks ago, it had a little white thread sealant tape on the end that screws in, but I didn't use any pipe dope...could me NOT using pipe dope on that cause a bad leak? It's a pretty decent leak as I could see it dripping on my driveway as the car idled at operating temp
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-25-2012, 08:40 AM   #16
TECH Senior Member
Garage is empty, add now
 
RamAir95TA's Avatar
 
Trader Rating: 2
Join Date: May 2005
Location: South Jersey
Posts: 9,488
Send a message via AIM to RamAir95TA
Default

The oil pressure fittings are both subject to 60+psi of oil pressure so applying NEW thread sealant is highly recommended. Personally I prefer a non-hardening paste - not thread tape.
__________________
95 T/A AI 200cc stock castings, 383, Performabuilt 4L60E, Ford 9", Tuned by PCMforless 3340#,
10.81 @ 124.16, 1.43 60' Video of 10-second pass 455whp, 445tq - Dyno Vid

LT1 PARTS For Sale, MSD Opti, steam crossover tube, BMR swaybar, MAF, etc.
RamAir95TA is offline   Reply With Quote
Old 06-25-2012, 08:41 AM   #17
Village Troll
Garage is empty, add now
 
SS RRR's Avatar
 
Trader Rating: 2
Join Date: Oct 2002
Location: VA
Posts: 7,156
Default

Quote:
Originally Posted by ahritchie View Post
...could me NOT using pipe dope on that cause a bad leak? It's a pretty decent leak as I could see it dripping on my driveway as the car idled at operating temp
Did you use any kind of thread sealant? Did you let the sealant for the manifold completely cure before starting the engine?
__________________
1996 Chevrolet Camaro Z28 SS #597 M6
Quote:
Originally Posted by z28SSilvest View Post
You sir, are a genius with the mind of a 10 year old.
SS RRR is offline   Reply With Quote
Old 06-25-2012, 09:00 AM   #18
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default

Quote:
Originally Posted by SS RRR View Post
Did you use any kind of thread sealant? Did you let the sealant for the manifold completely cure before starting the engine?
Nope....there was just 2-3mm of white thread "tape" already on the autozone oil pressure sensor, I just screwed it in as is; now that I think about it it took a couple minutes to position it to thread correctly trying to screw it in the fitting...maybe it rubbed off. I will get some pipe dope and dope the crap out of it tonight and see what happens.

Believe it or not, the directions for the "right stuff" say you can put the vehicle right back into service after it cures in less than 1 hour....the regular "ultra black" does say 24 hrs. We waited 24hrs the first time....but that was botched due to my finger lol. 2nd time we put it on just waited 2 hrs.....it didn't leak after a 30 mile drive, but now it is all over my driveway the following day.
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-25-2012, 09:55 AM   #19
TECH Fanatic
1994 Pontiac Firebird
My Garage
 
ahritchie's Avatar
 
Trader Rating: 1
Join Date: May 2010
Location: Charlotte NC
Posts: 1,605
Default

Quote:
Originally Posted by RamAir95TA View Post
The oil pressure fittings are both subject to 60+psi of oil pressure so applying NEW thread sealant is highly recommended. Personally I prefer a non-hardening paste - not thread tape.
Are you saying it's recommended to take both fittings off completely and put new sealant on them (not just the oil pressure sending unit?)

Is this possible to do without removing the intake AGAIN lol?
__________________
1994 Firebird Formula "The Purple car" Plum Crazy, 6spd, 383 with lots of engine and suspension mods..
1999 Firehawk Formula #37 Main DD, black, 6spd, longtubes, dyno tune, stock other than SLP options: level II suspension, hurst shifter, aurburn posi, SLP exhaust. More to come...
1966 Austin-Healey 3000 Mk III Toyota 5spd conversion, Proper English pimpmobile
1999 Buick Regal GS Supercharged! Project Old man sleeper/beater... 3.5" SLP pulley, K&N, 265hp/300+tq Stang/ricer slayer
ahritchie is offline   Reply With Quote
Old 06-25-2012, 10:06 AM   #20
BTC
TECH Fanatic
Garage is empty, add now
 
Trader Rating: 0
Join Date: Nov 2007
Location: Lansing, MI via Bowling Green, KY, Dalton GA, Nashville, TN & Atlanta, GA
Posts: 1,282
Default

I did not use any additional sealant when I replaced my oil pressure sensor, and it did not leak. I used an AC/Delco sensor. I'm not sure whether that might make a difference.
__________________
Bill

'94 M6 Z28 That's Been Sitting For 11 Years, Coated Kooks 1 3/4" Race Headers, Kooks ORY, GMMG Exhaust, MSD 8.5 Wires, TB Bypass, !AIR, !EGR
BTC is offline   Reply With Quote
Old 06-25-2012, 10:06 AM
LS1Tech
Pontiac Firebird




Paid Advertisement
Reply

Tags
95, camaro, copper, egr, gasket, general, intake, leak, lt1, lt4, manifold, motors, oil, powered, rear, stuff, ultra, valve, vbulletin, z28


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 On
Refbacks are Off




All times are GMT -5. The time now is 07:18 PM.


Powered by vBulletin® Version 3.8.7 AC1
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Advertising - Terms of Service - Privacy Statement - JOBS
Emails & Contact Details