here they get...
Junkyards here get a dollar per cubic inch on most V8's--so you can expect to pay at least that for a good running Caddy 500..they are not as plentiful as people lead you to believe anymore,at least not here!...here,big block chevy motors sell for at least a grand,even high milage ones that run,but need rebuilding!--IF you could even locate one!..
That is why the Caddy motors started gaining popularity--it used to be you had a hard time finding ANY big block chevy motor--now the scales are tipping the other way..many newer style 454's are starting to show up in the junkyards from the 90's trucks now,and about every Caddy has been bought up and they are getting scarce here now..the newer 454's are not as popular with the hot rodders with older vehicles though--swapping in the TBI,and other changes made to the blocks prevent some from using them..
I have a 1976 Caddy 500 and TH400 in my shed..its been sitting for about 8 years,I was going to use it,but now it will likely need to be rebuilt--it was from a Coupe Deville,and ran ok,but had over 100,000 miles..It turns over freely,but I would probably not use it in its current state..I'm only keeping it in case I blow my 6.2 up.or I might just sell it,or trade it to a junkyard guy I know, for another diesel motor, if mine craps out..
If you get a whole car,the Eldorado has the rear sump oil pan you'll need to swap the 500 into a GM truck--be aware they are a bitch to pull the motor out of though!--if you can do it without cracking the bell housing,you will be lucky--we pulled dozens at the junkyard,and only about 5 came out with no bellhousing damage..but you CAN sell the transaxle for good $$$ on E-bay,as many owners are having difficulty finding a rebuildable core with no bell housing damage..We started cutting the CARS up to pull the motors,since few of the bodies were much good anyway,to prevent losing $$$ by ruining the trannys..
