The factory 4g63 came with an 88mm stroke and s 150mm rod length. The available compression heights for this configuration are 34.7mm to 35mm. There are lots of pistons, rods, and crankshafts that stick to these standard dimensions and some of the fastest 4g63 cars in the world have set records using the factory dimensions. The rod/stroke ratio is 1.7 in factory configuration which is pretty good compared to many other engines.
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