The TH350 was not introduced until the 1969 production year. Generally by 1968 people wanted more gears than the PowerGlide offered, and Chevy responded by offering them the OPTION of ordering a TH400 with a 327. It was only standard equipment if you had a high horse motor.Just took my '68 in to a new mechanic today for some work. He immediately identified that my 327 is mated to a TH400, which I didn't know. Always assumed it was a TH350. He told me that it was offered as an option in '68.
That is correct. They noted how many high performance big blocks they made in total but not which cars received them. Same for the 360 to 370 horsepower 327 used in the Corvette and the Chevy II. They noted how many were made over all, but not what cars received them (there are a boat load of Chevelle owners with the L-79 motor under the hood and no way to prove it was originally put there by the factory).Big Dave, is it true that GM did not keep production numbers on specific engine sizes during the '60's? All I have ever been able to find is L6 and V8 production numbers.
I was just wondering if many '67 impalas came with a 327+TH400. I thought that most of the turbo 400's would have been matched to the big blocks but I may be wrong. Any ideas?