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I don't have this book but just out of curiosity what Antonick's credentials? Just wondering where he got his information..
I tend to agree that if Charley says there is one, there is. However, it is odd that the info on the car is so hard to obtain. I find it interesting that this is such a hot topic.
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I checked the Library here at the house and sure enough the original source seems to be Michael Lamm from his book "The Great Camaro" Lamm-Morada Publishing Co. ISBN 0-932128-00-9 (Third printing February 1980).
Page 114 Discusses the lack of TH as an option specifically on '70 with L-78.
Quote from the second paragraph: "with Turbo Hydro optional on all but the L-78 396"
Again on the same page in the 6th paragraph-quote: "In the Super Sport option (Z27; $289.65), the L-48 350 came standard, or you could order the L-34 or the L-78 396's with the 4 speed." "Turbo-Hydra-Matic was optional for the L-48 and the L-34."
Finally in the specifications section of this same book (on page 139) the "1970 Camaro Drivetrain chart" lists L-78 with TH for 1970 as N.O. (not offered)
Factual or not I am not taking a position on the matter at this point.
I will say that even by today's standards the writing of Lamm holds up very well factually even after all these years, however with only about 1/6th of the L-78's made (located to date) we can all speculate on what Chevy did or did not make.
At any rate -I think we have the original source of the information carried forward by Antonick in his book.
Phil