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670Re: 500 interchange and durability

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  • James
    Aug 13, 2003
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      I am no expert, but I do have the 500 mated to a FWD turbo 400 in my
      motorhome. I believe that everything is shared with the 455 Olds
      Toronado setup, leading me to believe you could use any GM
      olds/buick/chevy/cad trans.
      --- In
      Cadillac_Performance_Association@yahoogroups.com, "timiacobucci"
      <timordog@h...> wrote:
      > Hi everybody, my name is Tim Iacobucci and this is my first post on
      > this board. I haven't been interested in the big cad engines for
      > that long and I wish I knew about them sooner as I really like to
      > research things thoroughly and I have a good knowledge base on
      > engine I've worked on so far but this one. 460 being my first
      > love, sorry to and ford haters out there but I figure the ford vs.
      > chevy thing doesn't really extend to Cadillac and there are
      > probably a good amount of you here that enjoy romping bbc's as
      > much as the 460 crew with our "boat anchors". I haven't
      > had to long to comb the archives here but I can see there are
      > definitely people here with the 500 knowledge I'm looking for.
      > First I guess I should describe my project. I'm setting up 500
      > with 2 grand national tubros carbed to put in an 85 monte carlo.
      > From other message boards I've read a stock 500 makes a g car go
      > 11's, which I can believe if the torque numbers I hear about are
      > realistic. I've heard older closed chamber pre emissions headed
      > 500's were rated at 550 ft. lbs., how true have you all found
      > this to be? I ask because it leads into my next question which is
      > durability which I directly relate to torque production (within
      > stock rev range). I plan to keep it under 5 grand as I hear that is
      > a good practical limit to keep these engines comfortable but how
      > much torque production do you think this engine can tolerate before
      > it begins breaking stuff. I plan to upgrade head and main studs and
      > will go with somebody's forged rods if there are no cheaper
      > strength interchange rods from another engine? I also plan to o-
      > the block and weld up some sort of custom steel girdle/side bolt
      > device and accommodating pan. I want to use as much boost as I can
      > make without destroying the engine, what are the practical limits
      > the stock engine, and what levels do you think are possible after
      > correcting any weak points? I was told that the rods/rods bolts
      > would be the first to snap under big torque. If this is corrected
      > and if I can control cap walk how much abuse do you believe the
      > stock crank can endure? Are there any other cranks in between stock
      > and full out custom billet? How strong are the mains and what kind
      > of meat is there for like maybe splayed 4th additions? Has anyone
      > ever blown a cyl wall? I plan to keep the overbore as small as
      > possible for cyl wall strength, I've heard these blocks can be
      > very hard and have very good wear characteristics, is there a
      > of cleaning up and using stock bore? Would some hardblock help at
      > all, I don't want to do too much as I want to drive it on the
      > street and would like to keep as much water as I can.
      > My next big question is interchange. I plan on probably using a new
      > venture probably 4500 but depending on the durability of the engine
      > just possibly a 5600. Does anyone even know a source for these, 360
      > lbs. is harsh but not intolerable if it can endure massive torque
      > loads that would makeup for its weight. So how can I attach this
      > trans, what flywheels/ clutches will work with this engine? Does it
      > share any other gm bellhousing like maybe an olds and if I were to
      > go auto with a th400 is the stock behind a 500 that's rwd a good
      > core to build on, and what cars have these and which are 425? Are
      > these any different from other 400's and do any other flexplates
      > or starters interchange? Are some blocks better than others if I
      > get pre 73 heads elsewhere or is there a way to check for a good
      > block other than opening it up? How much does mileage generally
      > affect these engines, should I look for a high mile seasoned block
      > or a low wear low mileage one? What other parts if any interchange
      > with any other gm engines? And rods or pistons, I know no
      > crankshafts interchange but are there any year or type cranks that
      > are know to be stronger? Any other little bits or parts, fuel pump,
      > oil pump/filter, water pump or accessories/brackets?
      > I know that's a whole lot of questions but I'm real eager for
      > info, I plan to get the MTS book, any other recommended caddy
      > reading? Any and all answers, opinions or speculation is very
      > appreciated and I am very thankful for any helpful info/experience
      > you may share.
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