I've a 1981 R65 engine that came out of a "mixed" frame, and a 1979 R65 frame I'm installing it in. The donor frame had a non-R65 rear subframe, and I'm not sure what model the main frame was.
The '79 frame is clearly an R65 frame, in good shape; no signs of damage. With the engine suspended from the mounting rods there is quite a bit of space (perhaps 3/4" to 1") between the inside of the frame tube and the engine casting. I'm afraid I'll turn both nuts down to the shoulders on the rod and still have a gap (that's estimating by eye).
Are there spacers that should go between the engine casting and the frame, or is the frame designed to bend as the nuts are tightened on the rods?
The original frame was tight up against the engine.
Thanks in advance.