Signs of rust in Engine any Ideas

Your rust came from one of two places. Up through the headers if they were opened up. or condesation or water left in the mufflers, or down the intake through that open scoop from the wind and the rain. If you going to let-em sit you should cover the engine . You wouldnt believe how much water goes down the wing nut when it sits in the air cleaner dish. And also plug the exhaust condensation will go up the headers and stick-em fast. Seen both ways rust-um. Our super charged omni hydraulically lock from ten minutes in the rain. we now seal the flange and the wingnut with sealer.