I know where there is a 79 nova without the intergrated head. I can measure the exhaust pipe next time I am at that junkyard. As for the 292 stuff I don't know any answers. Jay 6155
You should know at first glance on that '79 based on where the exhaust exits, below the carb or underneath the #3 and #4 exhaust ports. I'm betting that it will be below the #3 and #4 ports, so it is the same manifold as the 292 with 2.25" outlet to keep the same exhaust. A 2" exit is too small for the 2.25" catalytic converter, so I'm betting they kept the same header pipe from the '75 to '78 L6 passenger car. Pretty doubtful that they would make a whole new casting just for one year.
