How do I perform a camshaft swap on a Chevrolet Corvette C6?

Difficulty: Hard

Swapping a cam in a C6 Corvette is a significant job, but it is well within the capabilities of an experienced DIYer. Because the engine sits low and far back, the main hurdle is making room to physically pull the camshaft out of the front of the block.

Here is the breakdown of what you need and how to get it done, combining community consensus with standard LS engine procedures.

The Parts List

According to C6 owners, your absolute bare-minimum parts list includes the camshaft, pushrods, valve springs, and a new crank bolt ⁵. However, while you have the front of the engine apart, it is highly recommended to replace the following:

• Harmonic Balancer: The factory C6 balancers are notorious for wobbling and failing. Owners strongly recommend upgrading to an aftermarket unit like an ATI or PowerBond while you're in there ⁵.
• Hardware & Gaskets: Front cover gasket, front crank seal, cam retaining plate and bolts, and a new timing chain ⁵.
• Crank Bolt: The factory GM bolt is torque-to-yield and one-time use. If you upgrade to an ARP crank bolt, it is reusable ⁵.
• Fluids: Engine oil, coolant, and power steering fluid ⁵.

The Procedure

Note: I don't have verified torque specs for your specific LS engine's crank bolt, cam retainer plate, or rocker arms in the provided data, so do not guess on these. LS crank bolts have a very specific tightening sequence (especially if using a factory torque-to-yield bolt). Check a factory service manual or the instructions provided with an ARP bolt for the exact figures.

1. Clear the Front of the Engine The standard procedure for the C6 platform requires making a clear path for the cam to slide out. You will need to drain the coolant and power steering fluid, then remove the intake assembly, radiator, cooling fans, and the water pump. Crucially, you will also need to unbolt and drop or shift the steering rack out of the way—otherwise, the balancer and cam will hit it during removal.

2. Remove the Valvetrain Pull the coil packs, spark plugs, and valve covers. Unbolt the rocker arms and pull the factory pushrods out.

3. Secure the Lifters You do not need to pull the intake manifold or the oil pump if you use the right tools to hold the lifters up ⁹. Standard LS practice is to spin the camshaft a few times to push the lifters up into their plastic trays. Then, insert 5/16" wooden or metal dowel rods through the oil galley holes on the front of the block. This holds the lifters securely in place so they don't drop into the oil pan when you pull the cam. Note: If you decide to replace the lifters and lifter trays, this trick won't help you—you will have to completely remove the cylinder heads, which requires new head gaskets and head bolts ⁵.

4. Extract the Camshaft Use a specialized puller to remove the harmonic balancer. Remove the front timing cover, unbolt the cam sprocket, and remove the timing chain. Unbolt the cam retaining plate. Thread a long bolt (or the old water pump bolts) into the front of the camshaft to use as a handle, and carefully slide the old cam out. Support the weight of the cam so the lobes don't gouge the cam bearings.

5. Install the New Cam and Valvetrain Lube the new camshaft generously with assembly lube and slide it in carefully. Reinstall the cam retaining plate, timing chain, and sprocket, ensuring the timing dots on the crank and cam sprockets are perfectly aligned at 12 o'clock and 6 o'clock.

6. Button It Up Install the new front cover gasket and front main seal. When installing your new harmonic balancer, standard practice dictates using a dedicated harmonic balancer installation tool—never use the crank bolt to pull the balancer onto the snout, or you will strip the threads inside the crankshaft.

Swap your valve springs using an LS-specific valve spring compressor tool. Drop in your new pushrods, bolt down the rocker arms (and trunnion upgrades if you bought them), and reassemble the engine accessories, steering rack, and cooling system.

Final Step: Tuning

You absolutely cannot just throw a cam in a bone-stock C6 and drive it; you will need a custom tune for the car to idle and run correctly ¹. Plan to have the car towed to a tuner, or arrange for a base map to be loaded so you can safely limp it to the dyno.