running etc/dump.4.1 on V7

[Eric Gisin]

Has anyone used 4.2's etc/dump.4.1 to create 4.2 dump tapes from a V7
file system with BSIZE=512?  NTREC would have to be changed from 10 to 20,
and I'm wondering if the change of
char	tblock[1024][10]    to
char	tblock[512][20]
completely changes the resulting tape format.
Please reply by mail as I don't read this group regularly.
		Eric Gisin, egisin at watmath (via allegra, decvax, clyde, utzoo)