Building the FRC’s New Engine: Part 1 Teardown

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Since setting up this site a little over a year ago I have yet to write a post about engines. Lets change that. First off, originally I built this engine for the IROC but it was largely interchangeable with the LQ9 I had in the FRC. When the LQ9 finally gave up the ghost I put this one in to replace it. These posts (Part 1 and 2) will be very picture heavy to try to show in detail what goes into rebuilding/building an engine.

Back in February 2020 I spotted a running driving 2004 GTO with a 6-speed manual for $3,000 on FB Marketplace. This is by far the cheapest running GTO I’ve ever seen let along one with a manual. I didn’t need it at the time but I knew I’d make money on it and get to keep parts so I jumped on it. I was able to drive it home then it got parked for a few months until I got caught up with other projects.

The GTO lived a long life. All the way to 249,000 miles before a deer “totaled” it.
I distinctly remember pulling this out on a 90 degree day before eventually joining Charlotte in the pool.

I parted out the rest of the car keeping the engine, accessories, ECU, and engine harness. It sat on the stand another couple months until the C7 was sold and then I ordered parts to build (performance) and rebuild (maintenance).

Intake(LS6), and coils removed.
Valvecovers and accessories removed. Waterpump loosened so coolant can drain out.
Water pump, rocker arms, pushrods, cylinder heads, and valley cover (LS6) removed.
Engine flipped over confirming the 2004 GTO LS1 had Gen IV rods.
Pistons/rods, mains, and crankshaft removed and confirmed this is also a LS6 block.
Parts laid out on the bench ready to be cleaned, upgraded, or replaced.
1 piston and rod degreased, 7 to go.
Had to soak them in two passes as I didn’t have my ultrasonic cleaner yet.
Front/rear & valley cover cleaned as well as mains.
Pressing in new rocker arm trunions (bearings)
Rockers cleaned up and trunions (bearings) upgraded.

While I was degreasing all the parts I could, I took the engine block, cylinder heads, and valvecovers to a machine shop to have them jet washed and new cam bearings installed as I lack the tools to do so.

Looking really good now.

Ready to reassemble. Click for part 2.


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