Yenko was assigned rights in 1974, began producing blocks in 1976 and continued thru about 1983. His blocks were initially cast by Winters and after several price increases molds, patterns etc. we're sent to Lockport..more price increases led to Paul Wright ,who machined the blocks to take over the casting also..Paul made changes to the molds and cast blocks for several years. I have his records.This info is covered in my book " THE YENKO ERA...continued. Canonsburg and beyond "
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