special vs century compression ratio change - how ?

[ceejay]

Hi all,

So I'm looking at parts to re-build the 364 nail head in my Century (in case I need to) and I find a few web sites selling "engine kits" for the 364.

They do not specify that the kit is for a low compression engine or high compression. so I'm assuming they sell the same kit for all 364 engines.

I gather that the compression ratio is different between the 364s in Specials and Centurys.... the easiest way for the manufacturer to change the compression would have been to use different pistons.... How did they do it on the 364s ?

did both the special and the century use the same pistons but change compression from the combustion chamber volume in the heads ?