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Re: [Cadillac_Performance_Association] Re: 1973 500 CI

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  • bill lutzius
    I think thats great,lots of info.I only was noteing that the non smog pump cars had the vapor can .I,m sure some had both.But you explain it much better than
    Message 1 of 10 , Dec 25, 2003
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      I think thats great,lots of info.I only was noteing
      that the non smog pump cars had the vapor can .I,m
      sure some had both.But you explain it much better than
      i.
      --- John Brody <jtbrody2002@...> wrote:
      > OK, here's the deal as far as I know...
      >
      > The routing of the water pump pulley on a
      > 368/425/472/500 depends on whether or not it had a
      > smog pump, because the smog pump is used to tension
      > the crank/water pump belt on smog cars. On non-smog
      > cars, the alternator is used to tension the belt --
      > and yes, the same alternator bracket can be used.
      > There were two eras of big block Cadillac that came
      > without a smog pump, and therefore used the
      > alternator to tension the water pump pulley. Some
      > early ('68-'70?) 472/500 Cads came without a smog
      > pump, but the pulleys positioned the belts very
      > close to the block -- no problem, since the
      > points-type distributor was narrow enough not to
      > interfere with the belts. Some later ('77-'79?)
      > 425's came without a smog pump as well, but the
      > pulleys positioned the belts farther away from the
      > block in order to allow space for the wider HEI
      > distributor. So, to be clear, ANY big block Cad
      > with a single-groove water pump pulley will work to
      > convert your water pump from being tensioned by the
      > smog pump
      > to being tensioned by the alternator, thereby
      > allowing removal of the smog pump. Later 425
      > non-smog pulleys will easily clear an HEI
      > distributor, while early non-smog 472/500 pulleys
      > will make HEI clearance tight. Hope this clears up
      > any confusion.
      >
      > Finally, the evap canister (where gas fumes
      > collected and sent back to the tank) *is* part of
      > the emissions equipment, but don't apply to the
      > routing of the belts.
      >
      > John
      >
      > bill lutzius <billlutzius@...> wrote:
      > The cars without a smog pump may have come from
      > outside california,which is where i am.But i see
      > them
      > every now and then at the junk yard.But they have a
      > can for vapors from the gas.Behind the drivers
      > headlight i think.Looks like a old coffee can with
      > hoses going back to the gas tank.So maybe this was
      > used instead of a smog pump.These cars were 69 or
      > 70.
      > --- ronhammer2000 <ronhammer5@...> wrote:
      > > What years did the 425 come without a smog part?
      > > Does this set up
      > > still use the same alternator braket? Was there
      > 500
      > > without smog pump
      > > too like Bill L. said. If so what years.
      > > Is there any where online that has these part or
      > do
      > > I have to call
      > > junk yards.
      > >
      > > Thanks for all the help.
      > > Ron
      > >
      > >
      > > --- In
      > > Cadillac_Performance_Association@yahoogroups.com,
      > > John Brody
      > > <jtbrody2002@y...> wrote:
      > > > I think the most common method is to use pulleys
      > > from a 425 that
      > > came from the factory without a smog pump. They
      > are
      > > stamped steel
      > > and are noticeable because the water pump pulley
      > > only has one groove,
      > > and the crank pulley has a big gap between the
      > water
      > > pump/alternator
      > > groove and the AC/power steering groove. These
      > will
      > > bolt directly
      > > onto a 472/500 crank hub and water pump. You will
      > > also need the
      > > plastic timing pointer, as the notch on the 425
      > > crank pulley is
      > > offset about 12 degrees from where it is on the
      > 500
      > > crank pulley.
      > > >
      > > > This might be a better solution if you have a
      > > 472/500 with HEI,
      > > because I've heard that the pulleys on early,
      > > points-ignition big
      > > blocks come very close to (and sometimes rub
      > > against) a wider HEI
      > > distributor. The 425's all had HEI, so the
      > pulleys
      > > are already
      > > spaced correctly for the distributor.
      > > >
      > > > A note from my experience: all 425's sold in
      > > California had a smog
      > > pump, making the right pulleys hard to find here.
      > > From what I've
      > > heard they are easier to find in other states and
      > > Canada.
      > > >
      > > > John
      > > >
      > > >
      > > >
      > > > Pollorey <philsfcs@n...> wrote:
      > > > Or you could remove the vanes inside the pump
      > and
      > > use it as an
      > > idler pulley.
      > > >
      > > > -----Original Message-----
      > > > From: ronhammer2000 [mailto:ronhammer5@a...]
      > > > Sent: Saturday, December 20, 2003 9:54 AM
      > > > To:
      > > Cadillac_Performance_Association@yahoogroups.com
      > > > Subject: [Cadillac_Performance_Association] 1973
      > > 500 CI
      > > >
      > > > I have a 1973 500 CI from an Eldorado. I am
      > using
      > > the engine and
      > > > transmission in a swap so I do not need all the
      > > accessories.
      > > > Is there an easy way to remove the air pump?
      > > Currently the air pump
      > > > is used to tighten the water pump belt. I could
      > > make a custom
      > > > tensioner or remount the alternator so that
      > would
      > > tighten the water
      > > > pump belt. Before I do all this I was just
      > > checking if there was an
      > > > easier way.
      > > > Ron
      > > >
      > > >
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      > to:
      > > >
      > >
      >
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      === message truncated ===


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