350 Lt1 ..lt4 ? - Chevy Nova Forum
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Old 31st-March-2008, 11:34 AM   #1
chevydario
 
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350 Lt1 ..lt4 ?

Hello as before I counted to my chevy Nova I changed him the motor 6 cylinders 250 by a V8 350 4 bolts. The theme is the following one: I am of Argentina and here there are few chevy 350 and I appeal to your aid to assemble it correctly with the components brought of USES. This it is the photo of my beloved motor one that before was placed in a truck the numbers that can be seen are the following 14093638 5,7 LG SGI:

http://img525.imageshack.us/img525/4...sc09077eq2.jpg

http://img247.imageshack.us/img247/4072/dsc09076dk5.jpg
http://img180.imageshack.us/img180/2905/dsc09004gt5.jpg
http://img247.imageshack.us/img247/5653/dsc09003dk2.jpg


The questions are the following.
_ The block is a gen II? LTI LT4?
_ Originally as many as HP has and that RPM?
_ The covers are of iron but to cheapen the costs I think to use those
_ The idea is to buy some KIT for throw 6500 rpm without problems with carburetor 650 holley
_ I rectify It to 0,30
_ there is a lot of difference between a Fixed and Hydraulic kit…. which is the difference because i would like but with fixed…I listen opinions.
_ TO see that they think of this kit:http://www.crateenginedepot.com/stor...02-P497C0.aspx
_ with the pistons these I can throw 6500 rpm they serve for the previous kit
http://www.crateenginedepot.com/stor...8-P1001C0.aspx
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Old 31st-March-2008, 12:47 PM   #2
69LT1Nova
 
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Quote:
Originally Posted by chevydario View Post
Hello as before I counted to my chevy Nova I changed him the motor 6 cylinders 250 by a V8 350 4 bolts. The theme is the following one: I am of Argentina and here there are few chevy 350 and I appeal to your aid to assemble it correctly with the components brought of USES. This it is the photo of my beloved motor one that before was placed in a truck the numbers that can be seen are the following 14093638 5,7 LG SGI:

http://img525.imageshack.us/img525/4...sc09077eq2.jpg

http://img247.imageshack.us/img247/4072/dsc09076dk5.jpg
http://img180.imageshack.us/img180/2905/dsc09004gt5.jpg
http://img247.imageshack.us/img247/5653/dsc09003dk2.jpg

The questions are the following.
_ The block is a gen II? LTI LT4?
_ Originally as many as HP has and that RPM?
_ The covers are of iron but to cheapen the costs I think to use those
_ The idea is to buy some KIT for throw 6500 rpm without problems with carburetor 650 holley
_ I rectify It to 0,30
_ there is a lot of difference between a Fixed and Hydraulic kit…. which is the difference because i would like but with fixed…I listen opinions.
_ TO see that they think of this kit:http://www.crateenginedepot.com/stor...02-P497C0.aspx
_ with the pistons these I can throw 6500 rpm they serve for the previous kit
http://www.crateenginedepot.com/stor...8-P1001C0.aspx
Hi, and welcome to Steve's!

I'm putting an LT1 in my Nova, so I know what you're going through. First of all, check the front of your block for a casting number 327 - this will tell you it's a LT1 5.7L. There are other ways to tell, but that's the easiest. You mention that it has steel valve covers, which rules out the LT4 - the LT4 used composite covers to keep noise from the valvetrain quiet.

Going to a carburetor is no problem on a LT1. GM Performance parts sells a carb swap intake, but fuel injection will give you the best horsepower, torque, and fuel mileage. If you're hitting 6500 RPM you're going to want a bigger carb than a 650 CFM Holley, it's too small for high RPM and you'll run lean.

Be sure you find out if you have an LT1 before doing too much shopping!
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Old 31st-March-2008, 09:06 PM   #3
69LT1Nova
 
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Where did you get that casting number from? I'm looking at an LT1 guide book, and they state that all LT1 motors have the same casting code of 10125327. Sounds like you might have something other than an LT1, especially since it came out of a truck. (no LT1s that I'm aware of ever came in trucks) More than likely you have a Gen 1 small block from a 87-91 truck with a 1 piece rear main seal.
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Old 1st-April-2008, 08:53 AM   #4
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??

Quote:
Originally Posted by 69LT1Nova View Post
Where did you get that casting number from? I'm looking at an LT1 guide book, and they state that all LT1 motors have the same casting code of 10125327. Sounds like you might have something other than an LT1, especially since it came out of a truck. (no LT1s that I'm aware of ever came in trucks) More than likely you have a Gen 1 small block from a 87-91 truck with a 1 piece rear main seal.

Hello 69LT1Nova, thanks by helping me. This page which would be my block (Is the number 22? ) . Are you very kind again thanks.

http://www.jimsperformance.com/blocks.html
http://www.cehighperformance.com/c_t...lock_codes.htm
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Old 1st-April-2008, 11:37 AM   #5
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Yep, thanks for the links!! It confirms that you do not have an LT1 or an LT4, you have a TBI or PFI truck block. It could be 22, 23, or 24 on that first website. The big differences between the LT1 and TBI are as follows:
  1. LT1 has reverse coolant flow - coolant goest to heads first
  2. LT1 uses a front mount distributor
  3. LT1 makes more power!
Good luck with your build, now that you know that you do not have an LT1. My suggestion: put a nice roller cam in the block, get compression up around 9:1, and put a carburetor on it.
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