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Obviously the cams. But what else? Head? Intake/exhaust valves?

Just curious. Thanks


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Don't know if any accessories (alternator, water pump, etc.) are the same, but the heart of the engine (block, head, intake manifold, and header) is pretty different.

Different parts include crank, rods, pistons, valves, and more.

The block has a larger bore (the 2ZZ has a larger bore than the 1ZZ, and a shorter stroke). The crank is different to reflect the shorter stroke. The rods and pistons are different to give the appropriate compression ratio and valve clearance. I think the valve angles in the head are different. The rocker arms which engage "lift". And so on...

I'd say it's a almost a completely different engine that just happens to bolt right in where the 1ZZ would, and it also happens to share the 1ZZ's bore pitch (distance between the centerline of each cylinder).

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So can a 2zz go into a 1zz? I have a 2000 toyota celica gt and I found a motor from a 2002 celica gts can I put that motor into my car
 
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