LS1 in a boxster

[landrovered]

Originally Posted by Mike_Yi

Sorry to guess Landrovered. Here's some specifics for you.

The LS1 block is part number 12561166.

The LS7 block is part number 17802854.

They might both be small blocks (though I'm not sure what the definition of small block is versus big block with current motors), but they are definitely NOT the same block.

Wouldn't you expect a block with a different bore to have a different part number?

All the LS engines are in the same family. They all share common components whether LS1 or LS9. They have evolved but are essntially the same design. Do you really want to go to the carpet on this one?

Much like the Gen I and II small-blocks, almost all the hardware amongst the different LS variants are interchangeable. In fact, except for the smallest (4.8L) and largest (7.0L) motors in the LS lineup, all share the same 3.622-inch stroke. In most instances, the cylinder heads, camshafts, crankshafts, and intake manifolds can all be mixed between different LS motors.

LS Engines decoded...The Ultimate Guide To Every Gen III And IV Small-Block Ever Built