Appears that Chevy changed the spec for the '41-'55 235 solid lifter pushrod, sometime after '58. My 1958 master parts book shows the same dimensions as in your photo. But, my 1968 master parts book shows the '41-'55 235 solid lifter push rod, PN 3836261, as 10-5/8" length. Here's the info from the '68 book.
