LH8: Air Intake System Differences

Ever since a saw a pic of ahelm3's 2009 LH8 engine I've been curious about the air flow indicator on his truck and why my 2009 LH8 doesn't have one.


@ahelm3

Well, from what I can tell GM had these air flow indicators on the early LH8 motors (2008-2009) and then sometime mid-year of 2009 they redesigned the airbox and eliminated the airflow indicator. Guess this makes the early LH8's even more rare.

Here's a pic of the original first design... take notice of parts #4 and #5.


AIR INTAKE SYSTEM. Fits: CANYON, COLORADO, H3

and here's the 2nd design without the indicator:

AIR INTAKE SYSTEM. Fits: CANYON, COLORADO, H3

My truck was built in May 2009 and and doesn't have the air flow indicator.

I would think that anyone with the LH8 or LH9 could add this air flow indicator simply by drilling a hole in the air box and adding the grommet and air flow indicator. I suspect that the air flow indicator is a visual indicator the helps you determine when it's time to replace your stock air filter or clean your K&N filter.

Item Number: 004
Part Number: 25861130
Description: GROMMET. Air Cleaner
GROMMET,A/CL AIR RSTN IND. Required: 01
For: N1 5.3-L(LH8) (2009-2009) (2009 - 2009).
For: N153(06) 5.3-L(LH8) (2008-2008) (2008 - 2008).
For: ST156(43-53) 5.3-L(LH8) (2009-2009) (2009 - 2009).
Cost: $5.09—$7.72

Item Number: 005
Part Number: 25813591
Description: INDICATOR. Air Cleaner
INDICATOR,A/CL AIR RSTN. Required: 01
For: N153 5.3-L(LH8) (2008-2009) (2008 - 2009).
For: ST156(43-53) 5.3-L(LH8) (2009-2009) (2009 - 2009).
Cost: $36.01-$54.57