I accidentally installed the intake and exhaust cams from the passenger side cylinder head into the driver's side head of a Jaguar V8, and vise versa. It wouldn't start. Showed no compression.
I'll remove the cams again and do a leakdown test regardless, but is there any hope I didn't just do a whole bunch of damage?
Depends on how big a difference there is between the cam profiles on each of them I suppose. If there was a big enough difference the cam might have been able to push the valve far enough down to tap a piston. Hopefully not. I'm sure you're probably ok 
In reply to belteshazzar:
Pretty sure its an interference engine, so heads will probably be coming off. Sorry
did you turn the engine over by hand while re-assembling (probably to do the timing and stuff - right?)? if so, you would've felt the valves hit the pistons if there was serious contact. Since the engine did not run and metal didn't have time to get hot and expand, I'd guess you might be alright. You can probably do a leakdown test (visually validate all valves are closed) on each cylinder to check if you bent valves.
At the end of the day though, if you have the cams off, taking the heads off doesn't seem like that much more work, and would probably be worthwhile just to check.
once you pull the cams for changing you can measure the installed height. If you bent something by hitting valves to pistons, the bent valve will not be @ the spec for installed valve/spring height...... if bent, they will be "shorter"
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