Talk:GM Vortec engine

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What is the difference between the Vortec 2500 and Vortec 3500?

There is no such thing as a Vortec 2500.

Contents

[edit] About the Vortec 4300

Back when the 4.3 engine was first used, it was not called the Vortec 4300. Also, intiially, when the engine was first used in GM pickup trucks, it actually had a 4 barrell carburator. I personally have seen one of these setups on an old truck before. I believe the 4 barrell carb may only have been around for a year or so, as they're extremely rare.

[edit] Plagiarism Claim

WARING THIS PAGE'S CONTENT IS DIRECTLY STOLEN FROM THE FOLLOWING LINK!!!!

WARNING THIS IS PLAGURISM!!!

http://experts.about.com/e/g/gm/GM_Vortec_engine.htm

Please sign your posts. Additionally, please read the quote at the bottom of that article: "This is the "GNU Free Documentation License" reference article from the English Wikipedia. All text is available under the terms of the GNU Free Documentation License. See also our Disclaimer." The About.com page is simply a mirror of the information available here. Ayocee 18:42, 26 October 2006 (UTC)

[edit] Vortec 5700

I can't tell but I think I know the answer but I will ask it anyway.

Was the Vortec 5700 pushrod? Because my pickup has one and I just wanted to know, thank you.

Yes, the Vortec 5700 was a pushrod engine. All Vortec V6 and V8 engines are pushrods.

Thank you very much.

[edit] Swapping engines

I realize this isn't a tech forum, but I haven't had much luck elsewhere. Seems the best information I've found is right here!

I have a 1994 Sierra K1500 with a 4.3 V6 - zero compression on cylinder #1. I would replace the heads but the engine has about 158K and I'm leaning more towards installing a fresh 5.7 - a crate 350 is actually cheaper than a crate 262, so I'm going with the 5.7 - I don't really care about 4 extra MPG. I thought this would be a popular swap but have found very little information about it. I've seen the topic scratched by a few forums but nothing really substantial, and certainly no actual experience. More than anything are the Jeep guys putting the V6 into their crawlers because it's lighter than the 350 and can be mounted high in the engine compartment.

Anyway, here's what I think I know:

The 5.7 will bolt up to my transmission, but I will need a new flex plate. The wiring harness is identical. I will need a new exhaust (jury's still out on this one, help me out folks). The 4.3 has a larger than normal radiator that will be sufficient to cool a 5.7. I will need new motor mounts.

Here's what I'm not sure of:

Will the sensors stay the same? (Knock Sensor, MAP, etc) What type/generation of 350 will I need to find to be closest to matching up? Will the fuel delivery/TBI I currently have work with a 350 with the proper manifold? (The 4.3 runs at about 9-13 PSI fuel pressure, I'm not sure this is adequate. Regulators, control modules, etc - will those change this?)

I'm somewhat tech savvy but I'm sure I've missed plenty. Any feedback or success/failure stories/pictures are much appreciated.

Thanks to all who took the time to read through this, looking forward to responses.

RRaleigh01 05:22, 8 September 2007 (UTC)

[edit] Last sentence of opening paragraph

"Modern Vortec engines are named for their approximate displacement in liters." Since the engines are generally named 5700 (fifty-seven hundred) or 4300 (forty-three hundred), this would be the displacement in milliliters or cubic centimeters. In this sense though, liters would be correct, as millililters is only a prefix designating the number times 10^3, but it seems that the displacement in liters would mean that the 5700 would be 5,700 liters - quite large. Zchris87v 16:44, 1 October 2007 (UTC)

Good point - changed it to cubic centimeters since milliliter is not commonly used in describing displacement, while the cc is. Ayocee 21:02, 1 October 2007 (UTC)

[edit] 5.3L Gen IV LH8

The 5.3L in the Hummer H3 Alpha (also for the '09 Colorado) is a "new" engine, or at least has a new designation that being the LH8, a Gen IV 5.3L small block Vortec engine. There is info on the GM Media site for specifics. If someone wants to add this, should take 10 or 15 minutes. —Preceding unsigned comment added by 69.128.69.122 (talk) 16:04, 25 March 2008 (UTC)