[dtw]

Hey Donnie,
The chain 'length' can become an issue depending upon how much narrower the engine becomes. If you wish to rebuild back to stock specifications, you can simply shim the cylinders with an appropriately-sized copper base gasket. The gaskets are readily available from Porsche or well-stocked builders.

On my 2.4, we shaved the heads a bit for compression. The chains became 'longer', but this did not require use of a larger chain idler sprocket. I did, however, have to shave down the mating surfaces of my chain cases a bit. My cam seals would have failed if I didn't.

Still, none of this matters if you want to stay stock - just shim your cylinders out.