4g61 and 4g63 same block?

[hubz91talontsi]

Are the 61's and 63's the same block with different piston bores?

 

[rush2252]

cmon man your postin in the noob section.. use the google search to search the site and just type "4G61 bore" i found like 20 threads on this.

 

[TunaTalon]

The same bore does not mean the same block.

I have seen postings claiming that all 4G6X blocks of the same year are from the same castings with only the machining for the bore and deck height different. But that was not from a reliable source.