4g63 vs 4g64 blocks?!

[Gomes]

I pulled my engine in late fall, and brought it to a machine shop in town and the piston on cylinder 1 was starting to detereate per pics but he said the engine has already been bored to 87mm and its worn the walls like a funnel. Wider on top and narrower in the bottom. So i assuming I need a new block. But my block is a 2.4l 4g64 6 bolt. Will I need another 4g64 block or can I use a 4g63 block with my rods and crank shaft to maintain the 2.4L displacement. I've been doing a lot of research on options and there's guys in Europe that are using the 4g67 block with the 2.4l crank and rods. Any help would be greatly appreciated and if anyone has a 4g64 6 bolt block that they'd be willing to let go that's with in 4 hours of the ontario border I will gladly buy it. Even having two wouldn't hurt


Oh he gave the measurements of what the cylinders were but I forgot to write it down. I'll have them by Tuesday tho.

Thanks

 

[lasthope05]

Since your are buying new pistons anyways you can use either block. If you use a 4g63 6 bolt block you would need to get stroker pistons that have the wrist pin 6mm higher with your current 4g64 crank and rods which would make it a 2.3.

 

[njclimber36]

Lasthope is right. The main difference in the 2 blocks in regards to the piston choice are bore and stroke between the two. The 2.4l has a larger bore and the block itself is 6mm taller than the 2.0l. Like he said, you can use stocker pistons with a 2.0l block, but lose .1l displacement. It might not seem like much, but its almost 5% more displacement. 5% extra on a 400hp motor would be 420hp. Obviously it isn't so simple, but I would use the 2.4l block and possibly if the money was there, longer rods. Good luck either way you go.

 

[Gomes]

I prefer to use a 4g64 block but finding one is seem to be impossible in Ontario, especially a 6 bolt.