Toyota didn't make a hybrid engine; it's a popular mod.

Keep in mind with that setup that you cannot use a 85+ block, or you'll never get the timing chain setup correctly; difference of 3 links for deck heights.

As far as IDing the block itself, just shine a flashlight at the flat spot behind the alternator, and you'll see the stamp there.

Both the 20R and 22R heads have round exhaust ports. Also, a 20R carb has around opening; the 22R has a rectangular opening.

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