g4cs came in the Hyundai Sonatas. Its just a 2.4L DOHC 6bolt motor. Similar to the 4g64 GS motor, just in 6bolt form. Has 1g big rods and the same pistons as the 64 Galant. No modifications needed to bolt up to a 7g other then modding the driverside motor mount perch, just like the 1g in a 2g motorswap. What else do you need to know?
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