Per our own forum member tclederman website, your 235 engine block was made from 1955 thru 1957 and your head was made from 1956 thru 1962. There is a date code on both the engine block and the head that would help narrow it down. The block code id behind the starter and the head date code is under the rocker.

Here is a [LINK] to his website.

Last edited by Phak1; 03/09/2021 2:06 PM.

Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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