LT4 Intake Manifold Gasket
04-15-2011, 06:39 PM
#1
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
LT4 Intake Manifold Gasket I have a 93 Camaro LT1 350 that has been rebuilt as a LT4 383. The heads and intake manifold were taken from a 96 Corvette Grand Sport LT4. The Intake manifold gasket for the LT1 seems to be slightly different from the LT4 and some of the ones that say they fit the LT1 state they are not for the LT4 and others say they will fit both.
GM performance gasket 12524653 fits 93 Camaro LT1 but says it will not fit 96 Corvette LT4
Fel-Pro MS 96386 says it fits 96 Corvette LT4 but not 93 Camaro LT1
Fel-Pro MS 95580 says it fits both
I talked to a tech from Summit and after he looked at several gasket numbers for both applications said there is a VERY SLIGHT difference and he suggested buying both and sending back the one I didn't need once I got the intake off and made a descision as to which one fit best. I would prefer not to have to do that so if anyone knows the correct gasket to use with the 96 Corvette LT4 intake and heads with the 93 Camaro LT1 block I would greatly appreciate the help.
GM performance gasket 12524653 fits 93 Camaro LT1 but says it will not fit 96 Corvette LT4
Fel-Pro MS 96386 says it fits 96 Corvette LT4 but not 93 Camaro LT1
Fel-Pro MS 95580 says it fits both
I talked to a tech from Summit and after he looked at several gasket numbers for both applications said there is a VERY SLIGHT difference and he suggested buying both and sending back the one I didn't need once I got the intake off and made a descision as to which one fit best. I would prefer not to have to do that so if anyone knows the correct gasket to use with the 96 Corvette LT4 intake and heads with the 93 Camaro LT1 block I would greatly appreciate the help.
04-15-2011, 06:53 PM
#3
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Also Fel-Pro gasket 1284 states it fits LT1 on the Jegs site but on eBay says it fits LT1 and LT4 (not ready to just trust info from eBay) and GM gasket 12528884 says it fits the 96 Corvette LT4 but not the 93 Camaro LT1. GM parts direct says the 12528884 fits the port location and design of the 96 Corvette LT4 and from what I can tell the only difference between the 93 Camaro LT1 and the 96 Corvette LT4 would be the port location and design. When you compare the GM 12528884 for the LT4 and 12524653 for the LT1 they look so close its hard to see any difference. If the only difference is the port location and size and GM says 12528884 is for the LT4 then I am inclined to believe that is the one I need but we all know it's not always that simple. I am really hoping someone out there has done this already and knows which gasket to use.
04-15-2011, 06:59 PM
#4
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Nope, I do not just want to ask what someone thinks and go with that I hope that someone has done this and KNOWS which one fits. Especially since there are multiple gasket numbers that claim to fit either or both applications even from the same manufacturer such as Fel-Pro. I didn't even include all the other gaskets that came up from other manufacturers when I tried searching for it. In fact Summit didn't even list a gasket when I searched for the 96 Corvette intake manifold gasket, it was only after I got on the phone with them that the guy found a gasket number to fit it. And trust me the guy I spoke to at Summit didn't seem very sure and usually when someone just takes the shotgun approach and says get them all and one is bound to fit, it usually means they have no real idea.
04-15-2011, 07:10 PM
#7
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Not to mention that if I bought all the GM and Fel-Pro gaskets he said MIGHT be the one I need I would be buying five gasket sets and then paying out of pocket to ship the other four back. I really do appreciate your response but I am not just asking for an opinion and then just going with that, I agree that would be stupid, I hope that someone actually knows the right one as they have done it themselves. There are alot of people on here that know more than the techs at different companies do because what a computer says is the right part doesn't always work out to actually be the right part. Someone who has done it and knows which one fits can tell you which one actually does fit. If it turns out that no one here has done it or remembers which gasket worked and I do have to go through getting them all and finding out for myself I will gladly post the results here so maybe it can help someone else in the exact same boat as I am in.
Trending Topics
04-15-2011, 07:14 PM
#8
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
jlpz, thanks for the response but is that a gasket that you yourself have put on an engine like mine (LT1 block with GM LT4 heads and intake) or is that just the number you got when you looked it up from GMPP or wherever? I trust your ability to look up the right part but again, it's the computer saying it's the right part that I do not trust.
04-15-2011, 07:20 PM
#10
What we have here is a perfect example of the current education system. Ability to reason is a completely lost skill.
The heads and intake are LT4.
What information do you have that suggests there is something about the block that would affect that?
The "Vette LT4" block was an LT1 block with a couple extra main bolt holes drilled. Same block you have just 6 extra holes in the bottom. How would that affect what intake gasket you need?
The heads and intake are LT4.
What information do you have that suggests there is something about the block that would affect that?
The "Vette LT4" block was an LT1 block with a couple extra main bolt holes drilled. Same block you have just 6 extra holes in the bottom. How would that affect what intake gasket you need?
04-15-2011, 07:23 PM
#11
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
LOL when I typed that GMPP number (12367777) in on eBay it does come up with the LT4 application but the seller is Summit. It was their tech that gave me two other GM part numbers and specifically said the GM gasket for the LT4 was the 12528884. Now you can start to see why I find this, trusting what the computer tells me or the tech at Summit is the right part, to be difficult.
04-15-2011, 07:25 PM
#12
Village Troll 
iTrader: (2)
LOL when I typed that GMPP number (12367777) in on eBay it does come up with the LT4 application but the seller is Summit. It was their tech that gave me two other GM part numbers and specifically said the GM gasket for the LT4 was the 12528884. Now you can start to see why I find this, trusting what the computer tells me or the tech at Summit is the right part, to be difficult.
04-15-2011, 08:06 PM
#14
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Not sure how old you are 96capricemgr but I am not a product of the CURRENT education system. Chances are you are more a product of the CURRENT education system than I am but either way I fail to see where this is an example of an inability to reason. If anything it is an example of reasoning too much. I could have just looked up the part and bought the first gasket that said it would fit my application, that would have been a failure to reason.
You made the statement that the heads and intake are LT4 clearly trying to show that the gasket should be the one for the LT4, if you go back through what I have written here you will find that is precisely my reasoning as well:
(my quote) "If the only difference is the port location and size and GM says 12528884 is for the LT4 then I am inclined to believe that is the one I need".
Now consider that GM, the manufacturer of both cars and engines we are talking about here has two different part number they say are for the LT4, part number 12528884 and 12367777. It is exactly the ability to reason that makes one say ok so what is the difference and why are there two different part numbers and gaskets for the exact same part on the exact same engine and which one do I need.
(96capricemgr's quote) "What information do you have that suggests there is something about the block that would affect that?"
None, I didn't have a hand in designing or building either one of the engines at GM and I haven't done any measuing on the LT4 block versus my LT1 block since I don't have a LT4 to look at and measure. If I had only found one gasket for either application then I wouldn't have needed to ask the question to begin with I would have simply chosen the one that went with the LT4 heads and intake. Worse still Fel-Pro along with two other manufacturers that I didn't include here show one gasket that supposedly works for BOTH applications. It is only because of my ability to reason that I see a problem here and question why there is conflicting information. That of course is what led me to ask the question here since there is most likely someone that DOES have more information than I do on the LT4 engine versus the LT1 engine and could shed some light on all this conflicting information, kinda like the whole reason we have these forums here to begin with.
Thank you for the information "The "Vette LT4" block was an LT1 block with a couple extra main bolt holes drilled. Same block you have just 6 extra holes in the bottom.". If this is the case, and I am sure that it is since you seem to have researched it, then I can say it would in no way affect which intake gasket I would need. Not having that information before your very helpful response meant I could not make that informed decision at that time.
Having said that I have seen other posts where people ask about using the LT4 heads or intakes on their LT1 blocks by just bolting them up and have heard other opinions about how exactly the same or not the same the blocks are but they are just that opinions. Which is why I asked in my post if anyone has actually done it themselves and know for sure which gasket would work. If anyone has actually used the 12367777 gasket for this type of application and knows first hand it will seal and work fine I would love to hear from you.
You made the statement that the heads and intake are LT4 clearly trying to show that the gasket should be the one for the LT4, if you go back through what I have written here you will find that is precisely my reasoning as well:
(my quote) "If the only difference is the port location and size and GM says 12528884 is for the LT4 then I am inclined to believe that is the one I need".
Now consider that GM, the manufacturer of both cars and engines we are talking about here has two different part number they say are for the LT4, part number 12528884 and 12367777. It is exactly the ability to reason that makes one say ok so what is the difference and why are there two different part numbers and gaskets for the exact same part on the exact same engine and which one do I need.
(96capricemgr's quote) "What information do you have that suggests there is something about the block that would affect that?"
None, I didn't have a hand in designing or building either one of the engines at GM and I haven't done any measuing on the LT4 block versus my LT1 block since I don't have a LT4 to look at and measure. If I had only found one gasket for either application then I wouldn't have needed to ask the question to begin with I would have simply chosen the one that went with the LT4 heads and intake. Worse still Fel-Pro along with two other manufacturers that I didn't include here show one gasket that supposedly works for BOTH applications. It is only because of my ability to reason that I see a problem here and question why there is conflicting information. That of course is what led me to ask the question here since there is most likely someone that DOES have more information than I do on the LT4 engine versus the LT1 engine and could shed some light on all this conflicting information, kinda like the whole reason we have these forums here to begin with.
Thank you for the information "The "Vette LT4" block was an LT1 block with a couple extra main bolt holes drilled. Same block you have just 6 extra holes in the bottom.". If this is the case, and I am sure that it is since you seem to have researched it, then I can say it would in no way affect which intake gasket I would need. Not having that information before your very helpful response meant I could not make that informed decision at that time.
Having said that I have seen other posts where people ask about using the LT4 heads or intakes on their LT1 blocks by just bolting them up and have heard other opinions about how exactly the same or not the same the blocks are but they are just that opinions. Which is why I asked in my post if anyone has actually done it themselves and know for sure which gasket would work. If anyone has actually used the 12367777 gasket for this type of application and knows first hand it will seal and work fine I would love to hear from you.
04-15-2011, 08:14 PM
#16
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Thanks SS_RRR and RobsquikZ28, I will definately do that tomorrow. I know the 12528884 is a complete set with both sides of the intake from GM and I believe it even comes with a small tube of sealant for the two ends. Maybe that is the difference between the 12528884 and the 12367777 which would explain the two different numbers for the same gasket. If that is the case when I call the dealership tomorrow then I can just get the whole set 12528884 if it is the same as far as cost goes.
04-15-2011, 08:16 PM
#17
Staging Lane
Thread Starter
Join Date: Jan 2011
Posts: 96
Likes: 0
Received 0 Likes
on
0 Posts
Thank you very much weaklt1, I really do appreciate you taking the time to try and dig up the part number for me. If it is the GMPP part then hopefully it is one of the two we already have and you can help confirm the proper fit.
04-15-2011, 08:30 PM
#18
TECH Apprentice
iTrader: (8)
Join Date: Apr 2009
Location: Texas.
Posts: 320
Likes: 0
Received 0 Likes
on
0 Posts
GM's part number of a LT4 specific intake manifold gasket is 12367777. There's another one, 12528884 but has relocated bolt holes. The one you want is the 12367777. I know I've had LT4 heads before..and I'm a limo driver..
http://www.oehq.com/oeparts_12367777...TOKEN=41847744
the price is is for one..you need 2..
http://www.oehq.com/oeparts_12367777...TOKEN=41847744
the price is is for one..you need 2..
04-15-2011, 08:34 PM
#19
TECH Apprentice
iTrader: (8)
Join Date: Apr 2009
Location: Texas.
Posts: 320
Likes: 0
Received 0 Likes
on
0 Posts
jlpz, thanks for the response but is that a gasket that you yourself have put on an engine like mine (LT1 block with GM LT4 heads and intake) or is that just the number you got when you looked it up from GMPP or wherever? I trust your ability to look up the right part but again, it's the computer saying it's the right part that I do not trust.
