Intro to the LQ4 and LQ9 LS Family: Gen. 3, 6.0L, Iron Block, Truck Engines LQ4 The LQ4 was introduced in 1999 as one of the first LS truck engines. It was available in GM pickups, vans, and …

LS Family: Gen. 3, 6.0L, Iron Block, Truck Engines

Upgrading the LQ4 and LQ9 Engines Getting more power out of my engine On a stock engine, the following upgrades can improve performance and fuel economy: A Cold Air Intake Kit Headers An …

Which LS engine do I have? Identify Chevy LS Engines by VIN Chevrolet's 3rd and 4th generation small block engines are generally known by their RPO code. You can determine the RPO code if you have …

Which LS engine do I have? Identify Chevy LS Engines by Inspection Before you begin any project, you need to know the starting point. When it comes to Chevrolet's 3rd and 4th generation small blocks, …

Nov 11, 2025 · Generation III Internal Engine - LQ9 cam in L33 - Evening everyone, I've got an L33 I'm freshening up to put in my 68 cutlass. 100% cruiser; no plans to race or boost. I just want a fun driver …

It replaced the LQ4 and LQ9 as the Vortec 6000. Along with the LY2, LY5, and LMG, it was one of the first 4th generation, LS truck engines. The LY6 used Variable Valve Timing (VVT). This helped it …

Jan 7, 2017 · Automatic Transmission - All about Flexplates, Converters, Transmissions and Spacers - When installing a different (non-stock) transmission there is often confusion over what flexplate to …

Jan 23, 2013 · Generation III External Engine - LQ9 243/799 vs 821/823 heads? - I sort of asked this question in the wrong forum. I posted a question about my LQ9 build but placed it in Internal Engine …

Gen. 3, Iron Block, LS Engines The following specs apply to RPO codes: LR4 LM7 L59 LQ4 LQ9 **Click the blue links in the table for more detailed information**