The official hyundai 2.4L G4JS (4G64) thread
Jan 16, 2013, 10:21 AM
#46
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OE Kia coils run 7mm plug wires and voltage is the same as the Evo coils. welding new bosses for Evo coils make sense if using an aftermarket coil.
Jan 18, 2013, 08:08 AM
#49
Also, I don't know if any of you guys know somebody who does cnc work, but I would love to see somebody make up a cover for the coils like on the EVO valve cover. Would make it look a lot better. Could make some money off em too if more people start to source these heads.
Jan 22, 2013, 01:57 PM
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Step 1: While you have the block sitting there you should test to see if a 63/64 front case cover will bolt and line up with the G4JS block. I did not test it and theres a 50/50 chance it might. If it does then you can simply swap in the EVO motor mount, the front case cover and everything attached, evo cam gears and call it a day. But if it does not then your off to step 2.
Step 1: While you have the block sitting there you should test to see if a 63/64 front case cover will bolt and line up with the G4JS block. I did not test it and theres a 50/50 chance it might. If it does then you can simply swap in the EVO motor mount, the front case cover and everything attached, evo cam gears and call it a day. But if it does not then your off to step 2.
May 20, 2013, 09:11 PM
#54
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Originally Posted by Live4Redline
This is not an option. If your using a G4JS block you won't be able to swap everything over. It's a completely diffrent design, belt path, widths, offsets and adjustments all the way down to the front case cover. There may be a chance IF you changed the front case cover (I hinted at this earlyer) that you may then be able to get everything to work but I have not tested anything and its a long shot. But you do not need adjustible cam gears if your using a G4JS block for any reason so why worry about it. That and if your using a 4G64 block you have to use evo gears anyways.
May 30, 2013, 05:00 PM
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I have a few questions. Just how close are the two bottom ends? If I had an Eagle crank or something, would it work in the block? Same questions for rods and pistons. I'm trying to find a forged piston that has the same static compression as the factory G4JS pistons. However, no one lists the compression ratio based off of hyundai heads, just 63 or 64 heads.
Jun 12, 2013, 01:23 PM
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I have a few questions. Just how close are the two bottom ends? If I had an Eagle crank or something, would it work in the block? Same questions for rods and pistons. I'm trying to find a forged piston that has the same static compression as the factory G4JS pistons. However, no one lists the compression ratio based off of hyundai heads, just 63 or 64 heads.
Jun 13, 2013, 03:39 PM
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1 point as in evo 10.5:1 pistons are about a 9.5/9:1 CR with the JS head. The JS head combustion chamber is about 10cc's more than the evo head. If that info is wrong then please correct me. 
