one has bigports and the other dosnt! lol
without the airflow meter on the bigport gze's or the factory 8 runner inlet manifold the best way is to look at the ports! bigport has 65mm wide ports and no oil return to the block unless it has been tapped in like i did. lol then the easy way is the oil return which comes out from the head on the left side of the engine{looking at the engine from the timing belt end} at the rear of the head.
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