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Yeah, I thought I saw in the 1981 C-Series brochure that it still could be ordered with the 534. I wonder what it's last years horsepower&torque ratings were.(?)
The last year was 1981, and the 534 was offered in C/CT-900's and Louisville 900's. VERY few were built after 1977 or so, and most of the later ones ended up in fire apparatus or were industrial 'crate' engines. I don't have the H.P. and torque figures handy, but at the end the 534 was in the ballpark with the Lima 429. That was a big reason why it was dropped in 1981.