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145 Posts
I'm not sure what is wrong so I can't figure out what to correct. Here's the situation:
I've got a '67 aftermarket subframe (Wayne Due C4 Corvette based) set-up for a big-block mounted with solid motor mounts. The motor (a P-AYR big-block mock-up) does not fit into the subframe. It is about 3/8" off from centerline to centerline on the bolts that fasten the block to the integral perches on the subframe (the CL to CL dimension on the subframe is 16 5/8 whereas the CL to CL measurement of the motor mounts on the solid motor mounts is about 16 1/4). There are three things that could be wrong.
1) The aftermarket subframe could be wrong. So far the subframe has fit everything else perfectly so I doubt it is off but I will ask this question....does anyone know the correct CL to CL distance for the motor mount bolts? Is it 16 5/8 or 16 1/4?
2) The mock-up engine could be wrong. How accurate are these mock-up motors? Is it safe to assume that it is accurate? I would hate to modify the frame or motor mounts to find out that the actual engine block will not fit later on in the build. Maybe someone has some experience with these blocks.
3) Are the solid motor mounts wrong? I really don't know what brand they are because I pulled them off an engine that I've had for about 20 years. If the other two are correct then these must be wrong but I'm not sure how to check them. FYI, they didn't really bolt cleanly to the mock-up block (is the block off or the motor mount?).
Any thoughts appreciated.
I've got a '67 aftermarket subframe (Wayne Due C4 Corvette based) set-up for a big-block mounted with solid motor mounts. The motor (a P-AYR big-block mock-up) does not fit into the subframe. It is about 3/8" off from centerline to centerline on the bolts that fasten the block to the integral perches on the subframe (the CL to CL dimension on the subframe is 16 5/8 whereas the CL to CL measurement of the motor mounts on the solid motor mounts is about 16 1/4). There are three things that could be wrong.
1) The aftermarket subframe could be wrong. So far the subframe has fit everything else perfectly so I doubt it is off but I will ask this question....does anyone know the correct CL to CL distance for the motor mount bolts? Is it 16 5/8 or 16 1/4?
2) The mock-up engine could be wrong. How accurate are these mock-up motors? Is it safe to assume that it is accurate? I would hate to modify the frame or motor mounts to find out that the actual engine block will not fit later on in the build. Maybe someone has some experience with these blocks.
3) Are the solid motor mounts wrong? I really don't know what brand they are because I pulled them off an engine that I've had for about 20 years. If the other two are correct then these must be wrong but I'm not sure how to check them. FYI, they didn't really bolt cleanly to the mock-up block (is the block off or the motor mount?).
Any thoughts appreciated.