im not certain it is the solenoid but i assume it is. my oil is filled up so i shouldnt' have trouble building the pressure. i just figured that the soleoid is easy to replace (its sitting right their on the left side of the head) i have an
F22B1.

i do not know how much they weigh... i assume 300 -400 lbs for the block and the head and all the internal stuff.

you could check the internet but, you'll get varying responses. i.e my car wieghs anywhere from 2855 to 3201 lbs (97 accord ex standard)