LT4 Heads question.
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
LT4 Heads question.
I'm picking up my 96 LT4 this weekend and was doing some thinking. I know a dangerous thing.
You see I have this LT1 with all LT4 top end sitting in my garage a buddy bought a few years back. He keeps saying he's going to stroke it and do it up, I think it's all talk. Anyway I'm wondering if the heads are worth sending out for further flow work or if a new set and what kind would flow even better than stock.
Probably has been answered here before but I'm lazy and don't feel like searching hundreds of posts. Plus fresh information is always better I think.
Here's what's sitting growing mold in my garage.
You see I have this LT1 with all LT4 top end sitting in my garage a buddy bought a few years back. He keeps saying he's going to stroke it and do it up, I think it's all talk. Anyway I'm wondering if the heads are worth sending out for further flow work or if a new set and what kind would flow even better than stock.
Probably has been answered here before but I'm lazy and don't feel like searching hundreds of posts. Plus fresh information is always better I think.
Here's what's sitting growing mold in my garage.
Race Director
Joined: Sep 2004
Posts: 13,793
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From: St. Peters MO Sometimes you have to prove yourself by doing alot of killing or alot of dying...
The LT-4 heads can be set up to flow comparable numbers to that of some reputable aftermarket heads. I'm stumped though... you are getting an LT4 right??? And the motor in your garage is and LT-1 with the LT-4 conversion... which motor are you planning on tearing into?
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Originally Posted by kwik_ta
The LT-4 heads can be set up to flow comparable numbers to that of some reputable aftermarket heads. I'm stumped though... you are getting an LT4 right??? And the motor in your garage is and LT-1 with the LT-4 conversion... which motor are you planning on tearing into?
If LT4 heads can't be made to flow much better than what they do stock the whole idea isn't worth it.
Melting Slicks
Joined: May 2003
Posts: 3,490
Likes: 68
From: Hewitt NJ
Originally Posted by ALLT4
Instead of having my car down for head work, the ones on the stand could be sent away for work then just swapped onto my car with little down time. It beats tearing the motor down and opened up for a couple of weeks or whatever it would take to have them done.
If LT4 heads can't be made to flow much better than what they do stock the whole idea isn't worth it.
If LT4 heads can't be made to flow much better than what they do stock the whole idea isn't worth it.
Large Impressive Member
Joined: Jul 2003
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Admiral94
A good porting job will do wonders for the LT4 heads. Check out this thread for LT4 flow numbers. Maybe he will still honor the groupbuy price. You can at least ask.
The LT4 heads can be made to flow more than you could ever practically use on the street. And this guy is good, ask me how I know! 
Burning Brakes
Joined: Feb 2003
Posts: 1,144
Likes: 18
From: Panhandle FL
I would run the part numbers on that motor in storage. I'm not sure it's a LT4. The intake looks like it has red overspray inside it, all LT4 intakes are painted from the factory with no overspray. The conversion kit also comes with full roller rockers, that motor has stamped steel rockers. I would check it out before sending any parts off for modding. 
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
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From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Also, LT4s don't have an EGR. Although I don't know if their intakes have a provision for it that's blocked off, or no provision at all.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
I would get the cast #s and make sure those are LT4 heads and not just a LT4 intake. Look at the rockers, no LT4's came w/o 1.6 R/R's on 10mm tapered studs that regular 3/8 ball rockers would not fit on, well and work any way.
Last edited by FD2BLK; Dec 14, 2004 at 06:24 PM.
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Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
The EGR has a block off plate on the LT4 intake
The LT1 and LT4 intake are not interchangable due to the raised runners of the LT4.
He said it was a conversion, so just because it doesnt have roller rockers doesnt mean it doesnt have the LT4 topend. But seeing the overspray inside the manifold would make me think twice. Def check the head casting number and make sure you have what you think you have.
The LT1 and LT4 intake are not interchangable due to the raised runners of the LT4.
He said it was a conversion, so just because it doesnt have roller rockers doesnt mean it doesnt have the LT4 topend. But seeing the overspray inside the manifold would make me think twice. Def check the head casting number and make sure you have what you think you have.
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
If someone painted that manifold red they went through great pains to make it look real and what would it benefit them to be found out a fraud?
As for the heads, the guy did say he just threw his old stuff on them and lost interest in the project. It all could be fake for all I know right now. I'll take some detailed pictures for you all. What should I get shots of to clear things up?
As for the heads, the guy did say he just threw his old stuff on them and lost interest in the project. It all could be fake for all I know right now. I'll take some detailed pictures for you all. What should I get shots of to clear things up?
Melting Slicks
Joined: Jan 2002
Posts: 2,784
Likes: 3
From: Atlanta GA
LT4 heads and intake are worth alot more then LT1
Take a picture of the top of the head by the rockers, there will be a casting number, Should be on teh passanger side towars teh front of the head If im not mistaken
EDIT... actually you dont need to take a picture, just copy the number down and post it
Take a picture of the top of the head by the rockers, there will be a casting number, Should be on teh passanger side towars teh front of the head If im not mistaken
EDIT... actually you dont need to take a picture, just copy the number down and post it
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
It was a good idea anyway... Looks like my buddy got ripped, I thought that whole purchase was a bad idea from the get go. Oh well maybe I can still talk him into stroking it, he does have a '95 and why not give it a shot. I know if I had a spare motor sitting around collecting dust I'd be doing something with it.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Originally Posted by StealDads67
The LT1 and LT4 intake are not interchangable due to the raised runners of the LT4.
Last edited by FD2BLK; Dec 14, 2004 at 08:48 PM.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Looks like your budy got screwed.
10207643...94-96...350..........Gen.II LT1, aluminum, reverse flow cooling
10239902...96-up...350..........Gen.II LT4, aluminum, reverse flow cooling
http://www.ajf36.com/casting_numbers.htm
10207643...94-96...350..........Gen.II LT1, aluminum, reverse flow cooling
10239902...96-up...350..........Gen.II LT4, aluminum, reverse flow cooling
http://www.ajf36.com/casting_numbers.htm
Drifting
Joined: Feb 2004
Posts: 1,485
Likes: 2
From: Champaign, IL
St. Jude Donor '05
that really sucks 
the first thing I noticed was the rockers and I'm thinking why in gods name would someone buy LT4 heads and intake for big $$ and then put on some pos LT1 rockers? Well I guess my question is answered! tough luck man
the first thing I noticed was the rockers and I'm thinking why in gods name would someone buy LT4 heads and intake for big $$ and then put on some pos LT1 rockers? Well I guess my question is answered! tough luck man
Thread Starter
Melting Slicks
Joined: Dec 2004
Posts: 2,137
Likes: 5
From: Howard PA
Really, I could care less. It's my friends motor, he bought it sight unseen on E-bay. He only paid a G for it and really just wants a seperate motor to build this winter. Then come spring just drop it in and sell his old one.
I'll have my REAL LT4 Vette this weekend! Talk about a long week it seems.
I'll have my REAL LT4 Vette this weekend! Talk about a long week it seems.
