I had friend working ,going to school GMI he was working in dyno room at Pontiac. He gave me the dyno sheets from the SD455 about 1976. I've given them out to many people over the years.( he ask me to keep them to myself then at 1st POCI orange county I gave them to Pete for the first time) they are dated1970 at the top. I do have nos push rod tubes. Interesting heads
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