Tony,
My book is a '59 Chevy Parts and Accessories Catalog. I also have a Corvette only P&A from 1971 and the 6 cyl. oil pump illustration doesn't show the washer and there isn't a listing for it either.
My one and only experience with a 235 was when I built one for my '49 using a Speed-O-Motive kit. Had a performance cam, Mallory dual point conversion, headers, Clifford intake with a Carter 390 CFM four barrel. After about a thousand miles, I ended up with 'gold' metalflake oil. I had used one of those bronze aftermarket distributor drive gears and the teeth had worn away on the cam gear. I replaced the distributor gear with a stock one and changed the oil. About a year later the cam started to go flat. Not to long after that, I pulled it out and put a 350 in it. All this was after the machine shop ruined the original 235 block for me. (They were kind enough to replace it though.)
That was in 1978 and I finally sold the 235 a few years ago. I don't have a clue whether it had the thrust washer in it or not.
I feel Chipheads pain though...
