Stock Vortec Rockers?

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#11

03-09-2016, 05:10 AM

Toocute350

Junior Member

Join Date: Oct 2015

Location: Louisiana

Posts: 322

Quote:

Originally Posted by midnightbluS10

Today I pulled the old 4.3 from my Blazer and installed the reman'd GM longblock I bought. I noticed the rockers on the new engine are different than any I remember seeing. They look similar to LS1 rockers. My stockers look like this:

Which is what pulls up when I search for replacement Vortec rockers. PN 12599650

This is what came on the new long block:

Do those look correct?

I finally see someone else from Louisiana.Aren`t you glad we don`t have to worry about salt on our roads.Alot of guys have more problems up north than anything.I bought mine second hand back in july.i`ve had 0 problems so far,no rust either.every time you look around mother nature plays hell on vehicles up north.

#12

12-19-2017, 09:50 AM

midnightbluS10

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Join Date: Mar 2007

Location: Shreveport, LA

Posts: 401

Quote:

Originally Posted by Captain Hook

2002 and older, ("W" VIN, L35 engine) uses standard rockers. 2003 and newer, ("X" VIN, LU3 engine) uses roller rockers. An easy way to quickly identify an LU3 engine, is that it does not have secondary air or an EGR valve.

I don't think that's correct. My truck is a 2001 and came with roller trunnion rockers, as pictured. It couldn't have been the only one. Still, my point was the style(LS1 style) of rocker was different. Until that point, I had never seen those on a V6. Only the 4.8/5.3/5.7/6.0/etc... That's what I was asking about. Sorry if I wasn't clear about it.

#13

07-24-2018, 03:38 AM

Kyle Diehl

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Join Date: Jul 2018

Posts: 1

Quote:

Originally Posted by midnightbluS10

Which is what pulls up when I search for replacement Vortec rockers. PN 12599650

This is what came on the new long block:

Do those look correct?

my 2000 s10 has them in there to... do u kno when they came out with them

#14

07-24-2018, 08:28 AM

LesMyer

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Join Date: Oct 2014

Location: North Central Indiana

Posts: 4,074

Quote:

Originally Posted by Kyle Diehl

my 2000 s10 has them in there to... do u kno when they came out with them

Google "MR-903 photo" That's what these rockers appear to be. Aftermarket Melling rockers, or at least the same as....

Last edited by LesMyer; 07-24-2018 at 08:31 AM.

#15

03-28-2019, 06:34 PM

Cblueyes8

Starting Member

Join Date: Mar 2019

Posts: 1

Rockers..

I have same on my 2014 crate..i have a question for you about your build..my 4x4 oil pan 1996 will not fit the big aluminum timing cover..will the 4x4 blazer with L35 fit?be great to hear any input u have..ty

#16

01-30-2020, 04:27 AM

midnightbluS10

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Thread Starter

Join Date: Mar 2007

Location: Shreveport, LA

Posts: 401

Quote:

Originally Posted by Captain Hook

That's incorrect. My 2001 had roller fulcrum rockers, as pictured. It wasn't the only one. Afaik, that started around 1996.

Last edited by midnightbluS10; 01-30-2020 at 04:29 AM.

#17

01-30-2020, 11:00 AM

rancha9

Beginning Member

Join Date: Aug 2016

Posts: 12

Those LS style rockers are perfectly fine. They come on newer crate motors and they're what I bought when I rebuilt mine.

You can also purchase them directly from rockauto.com.