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Old 05-14-2013, 11:35 PM
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rebuilding a 5.7 vortec engine

Hey guys I want to swap a vortec 350 engine out of a 96 tahoe into my jeep

the tahoe has almost 300,000 miles and the engine still runs strong but it is burning oil now

I'm planning on boring out the engine .30 over new pistons and rings and get the heads installed with new valve seals and replace all the new gaskets

the thing is I still want to use the factory computer and fuel injection, will boring it .30 over effect anything ? I also want to swap out the factory cam, what is a good cam that will give me slightly more power than stock yet still be compatible with the factory computer ?

will I have to keep my compression ratio down to factory level in order for the computer to work properly ?

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Old 05-14-2013, 11:59 PM
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An administrator may want to move this thread to "Modern Electronic Engines".
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Old 05-15-2013, 02:42 AM
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no not at all, however even though it's a high miles engine, it may not need bored. a lot of engine blocks are made of cast iron alloys which hold up so much better, you may be able to resurface the bores with a hone, and re ring the pistons and re bearing the rest. even if you have .006 to .008 piston to wall clearance you will be fine and get half size rings.
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Old 05-15-2013, 08:48 AM
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Quote:
Originally Posted by xzero117 View Post
Hey guys I want to swap a vortec 350 engine out of a 96 tahoe into my jeep

the tahoe has almost 300,000 miles and the engine still runs strong but it is burning oil now

I'm planning on boring out the engine .30 over new pistons and rings and get the heads installed with new valve seals and replace all the new gaskets

the thing is I still want to use the factory computer and fuel injection, will boring it .30 over effect anything ? I also want to swap out the factory cam, what is a good cam that will give me slightly more power than stock yet still be compatible with the factory computer ?

will I have to keep my compression ratio down to factory level in order for the computer to work properly ?
how about a brand new one.. for less than what you can rebuild yours??
1919.00 gets you a g.m. crate #12530283 (96-02 vortec 350 replacement with 4 bolt mains and all new parts..) and that price is from jegs and they ship them FREE.. just bought one.. for some reason, chevy dealers add a 100.oo core charge and so did summit, jegs did not. jegs was 160.oo cheaper than summit, summit has free shipping also, and was 80.oo less that pace, but pace adds the core and then shipping charges.. and 660.oo cheaper than every local g.m. dealer I called..and I called 6.. lowest was 2498.oo+core100.oo
I looked for weeks and jegs was the best price and mine got here fast ..

then swap over the efi parts/etc(I'd replace the spider,but maybe after 300k it's already been)
good luck

Last edited by gearheadslife; 05-15-2013 at 09:00 AM.
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Old 05-15-2013, 08:01 PM
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Originally Posted by prumora1 View Post
no not at all, however even though it's a high miles engine, it may not need bored. a lot of engine blocks are made of cast iron alloys which hold up so much better, you may be able to resurface the bores with a hone, and re ring the pistons and re bearing the rest. even if you have .006 to .008 piston to wall clearance you will be fine and get half size rings.
All 300,000 mile Chevy engines will need boring. A .006-.008" piston/wall clearance will sound like cylinders full of monkeys with jackhammers when cold started. GM had noise and skirt problems at .003" and had to warrantee many engines..

Most of the ones I get in are 180-220,000 mile and have to be bored .030-,040" because of coolant circulation problems on end bores.

Plus the heads are cracked!!

What is a half size ring.? Been in this business over forty years and never heard of them.
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Old 05-15-2013, 09:28 PM
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gee, perhaps you need some more training, because there are rings at .015, .025, .035 and etc.. half sizes.

also your saying that gm has problems at .003, I can see them having problems at .003 for generating lots of heat and also not enough room for expansion and end up bust tops of pistons off.

our standard everyday race engines that last all year start out with a piston to wall clearance of .006 and that's on alcohol, now I don't have a machine shop and a business and don't know everything, but what I do know is that the 90's lt1 engines through the lsx engines have a higher nickel and manganese content that makes them stronger and more durable than the old blocks of the 70's and 80's that people are more familiar with due to the expense.
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Old 05-15-2013, 09:44 PM
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Originally Posted by prumora1 View Post
gee, perhaps you need some more training, because there are rings at .015, .025, .035 and etc.. half sizes.

also your saying that gm has problems at .003, I can see them having problems at .003 for generating lots of heat and also not enough room for expansion and end up bust tops of pistons off.

our standard everyday race engines that last all year start out with a piston to wall clearance of .006 and that's on alcohol, now I don't have a machine shop and a business and don't know everything, but what I do know is that the 90's lt1 engines through the lsx engines have a higher nickel and manganese content that makes them stronger and more durable than the old blocks of the 70's and 80's that people are more familiar with due to the expense.
You have some strange thoughts.. Yes, I can tell you don't build engines..

Oversizes stated are just oversizes, not half sizes. An oversize ring in a std bore with used piston is instant disaster.

Modern GM engines use hypereutectic cast pistons, very short skirts and .001-.0015" is common clearance. The clearances you quote are for old TRW/SpeedPro forgings. Modern stuff uses a lot tighter clearance.

LT-1 and LS motors are not the subject here..
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Old 05-16-2013, 08:59 AM
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There are some big commonalities between the LT1 of 92-97 and the Vortec 305/350s.
Cranks/rods/pistons are the same. The iron headed LT1 350 94-96 and the 94-96 L99 4.3 V8 and the Vortec 350 96-02 all use the exact same cam.

Older GEN 1 LT-1's are differnt.

peace
Hog
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Old 05-16-2013, 10:59 AM
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The heads are probably cracked, and if not already cracked, will do so shortly after you start beatin on it in a Jeep.
Get the new engine.
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