I just had a machine shop rebuild my 1955 248. It's quite an expensive engine to rebuild. Their material cost for the block was $1,400. That's only a little more than the prices I was getting from Patricks, Kanter, and Egge. My engine was pretty worn and they bored it out to 40 thousands over. I'm not sure where they got the pistons but I did some checking before I took it in. Egge at that time had 20, 30, 40, and 60 thousands oversize for around $400 for a set. The larger bore sizes may be more readily available.
My engine had flat top aluminum pistons with four rings that are apparently unique to 1954 and 1955. Chevy pistons difinately won't work. I hate to be the bearer of bad tidings.
