88 Police 350 specs

[Eric Deslauriers]

Steve,

Thanks for the response.
In this case, when I accelerate, I can hear the knocking, then the ECM steps up &
you feel power go down. Then the SELight comes on.
The 91 cop engine actually was a TBI engine AFAIK. I had the opportunity to buy
that one, but it was pretty worn & burned some oil.

Eric D

steve ravet wrote:

> Had this problem in my S-10 V8 conversion for a long time ('91 cop car
> motor).  Was caused by a bad knock sensor -- smashed while installing
> engine.  Unfortunately it was impossible to get at until I had the front
> diff out for unrelated repairs!  I have since replaced the knock sensor
> (in a more accessible location) and all is well.
>
> The ECM runs a test when the engine is hot and TPS > 50%.  It advances
> the ignition and expects to see knock.  If it doesn't it assumes ESC is
> bad and sets a code.  On mine it would also use some kind of back up
> timing, because after the check engine light came on the engine would
> run very poorly, bad throttle response, temp gauge up 10-15 degrees,
> etc.  Shutting off the engine would fix that, until the next time you
> got in to the throttle.  The knock test is very painful to hear.  With
> no knock sensor it lasts about a  second and sounds like the fan has
> come loose.  Very audible knock.  In this conversion the knock sensor
> was relocated to the (custom) motor mount.  Seems to work fine there.
>
> --steve
>
> Eric Deslauriers wrote:
> >
> > Hi all,
> >
> > Some time ago, I swapped a (carbureted) center bolt head police 350 into
> > my TBI Blazer with the problem that a knocking code would get thrown
> > after warmed up and > 1/2 throttle.
> >
> > I've been able to obtain what I believe to be the cam specs for that
> > engine. This doesn't seem to be a huge cam.
> >
> > How does that compare to a typical 88 truck 350? I know the timing on
> > the police motor is set at 6 degrees, while the truck wants 0 degrees.
> > The police engine won't run in my truck unless I move the timing to 6
> > degrees (backfires through the TBI - ouch). Why would that be?  FWIW, I
> > had to reuse the distributor from the police engine since the cam gear
> > is backwards from the regular distributor. Would this be related?
> >
> > <snip>
> > police 87 and 88 are the same. they both had 8.2 to 1 compression, 4
> > barrels, and duration 194*int.- 202*ext. (my guess is this duration is
> > @.050). the lift is .384" int.- .404" ext.  112* lobe separation.
> > replacement part number for crane cams is  104121
> > <snip>
> >
> > Thank you,
> > Eric D
> >
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> --
> Steve Ravet
> steve.ravet at arm.com
> ARM,Inc.
> www.arm.com
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