Is it even possible? Can I mod (port, etc) an LT1 intake into an LT4 intake? What exactly is the difference between the two?

 

Its possible, but if you get the LT4 intake i believe you will have to get the LT4 heads as well. I would wait until i had enough money then get the entire LT4 conversion (cam, intake, heads, etc) but if you wanted until you got that you can always port the stock manifold behind the throttle body gasket so it matches the size of the TB, if you have an aftermarket one, that will take a few hours though with a diegrinder.

 

I think the LT4 intake is a little taller, has a raised roof and longer runners (compared to the LT1). I don't think it would be possible to turn an LT1 intake into an LT4 intake. I am pretty sure that a ported LT1 intake would be just that. Someone correct me if I'm wrong.

 

I assumed as much, had one for free if I wanted but I'm going with bigger heads and knew I'd have to have an LT4 intake. Just thought I'd ask, thanks.

 

LT4 Intake w/ LT1 Gasket

 

Do a search. A couple very recent threads on this subject. The archives are short lived, but good. (a little rant) The '92-'94' or 5 (earlier years) LT1 intake manifold actually has larger ports than the LT4. Phil's pic shows how/why. BTW, the LT1 head intake ports are very similar in shape to the ports on an LT4 intake, and later LT1 intakes. So, what is this showing/telling you? The airflow path from the intake into the heads of an earlier LT1 is guilty of having a larger opening dumping into a smaller opening. This is a big no-no in the porting world. When GM designed (designed ? sic) the LT4 intake manifold, they duplicated the shape of the intake ports in the heads (LT1 & LT4). The subsequent (later years) LT1 intake manifolds duplicated this shape, and in doing so, removed the airflow interference of larger into smaller. Wonder who at GM turned on the light switch? Anyway, obviously less expensive than casting changes to the heads.

 

Why didn't anyone tell me to pic up a newer lt1 manifold and slap it on my 94? I never heard that before, i knew the heads where ever so slightly different. It can't be that much of a difference since the newer cars only have a few more HP.

-Brent

 

Posts/threads, both past and present are valuable to the extent that people take the time to view them.

It isn't anything a little port work isn't able to correct.

 

Ummmm, i really don't know what your talking about. Sometimes searches are really hard unless you know exactly what your looking for mystery man. I surf this site WAY more than the average guy has access to, and regularly use the search feature. I still don't know what your talking about.

Either way, it's obviously only a couple HP at best and nothing earthshattering.

-brent

 

[QUOTE]Originally posted by arnie
Do a search. A couple very recent threads on this subject. The archives are short lived, but good. (a little rant) /QUOTE]

thanks for the tips, get over your little rant, lol, I always search this site top to bottom before posting, except when I was new here and didn't know any better.

 

He was trying to help, and he offered the same advice I have many times. His reward it hostility .

This exact topic was covered twice in the past four days...... then here comes the third post.

 

Well, i can agree with the search button for the original question which has been covered. But my question was about Arnies reference to the lt1 intakes being different for different years. This is the only place/person that i've seen mention it. That difference didn't come up in the advanced tech thread which is huge. I did another search and I didn't come up with a reference to different intakes based on years. I also searched gmpp to see if i could come up with two different part numbers for it. Even though it doesn't matter much i would still like to know if there were in fact two different lt1 intakes for 94/95 vs 96/97, other than the 93 fuel rail differences.

Can you offer some insight into that question Fred?

EDIT
OK, foot in mouth, i've found another reference to the 94/95 being different from the 96/97

"the casting number on a 94-95 intake located on the right side of it towards the back is 10108630... if its different then you probably have a 96-97."-Turbo_Z


Are all LT1 intakes the same


Have a nice day everyone.

-Brent

 

Hostility? Dude what are you talking about now??? LOL....I think with me stating "Thanks for the tip" ...he realized I appreciated his help, if you read his post about the "rant" part it's obvious he meant it harmlessly as did I in my reply, it's called having a sense of humor

 

My comment wasn't directed specifically at you, but also at the post preceding it. I didn't "read" your post the way you explained it, so my apologies for misinterpeting your intent.

Fred

 

how bad is it to have a 94 intake bolted on 97 heads?? i didnt even realize the intakes were different until i had my old 97 in my hands and my car was put back together.. at that point it was a little late. wonder if this could cause some of the idle problems ive been having... from what ive gathered, the ports match up a lot better with 97 heads/intake but talk is cheap and i need proof.