6 CYLINDER parts for sale

'67 and earlier slant-6 crank counterbore (and torque converter nose) are ¼" smaller in diameter than '68-up. You can put an engine with the '68-up crank in front of a '67 or earlier auto trans (you have to use a 1/8" spacer ring between the smaller torque converter nose and the larger crank counterbore if you don't want to eat up trans front pump bushings and seals) but you cannot go the other way around with a pre-'67 crank in front of a '68-up trans, unless you either have a custom torque converter specially built or use the torque converter and most of the front pump and input shaft pieces from a '68-up transmission; the '68-up torque converter will not fit an unmodified '67-down transmission.