Re: 350 chevy compression/performance question


"Rick2950" <rick2950@xxxxxxxxxxx> wrote in message
news:1138593581.735080.20810@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I have a 66 Impala SS ragtop with a small block chevy 350 and Turbo 350
> auto tranny.
> I just like to drive it around now and then and go to a show.
> My motor is making some very odd noise that we now believe to be in the
> bottom end.
> The few who have listened to it have not had a solid guess.
> The last guess was "maybe it is a wrist pin"
> Sounds like the lifters do not quite oil up.
> The noise is present when I let off the gas and the rpm's start to
> decrease.
>
> I have replaced the cam/lifters/valve springs/push rods and rocker arms
> but the noise is still present so that is why I now believe it is
> bottom end.
>
> A local shop wants $825 to completely re-do my short block.
> Due to the wifes '67 Camaro taking up our money right now, $825 is a
> bit steep at this time.
>
> A guy I work with has a 350 with approx 5,000 miles on it that he will
> sell me for $400.
> The issue about this motor is he stated "it just has some low
> compression pistons in it so you can run any gas without ping"
>
> So,,, if I just want a short block that is known to have no issues but
> has some lower compression pistons (no idea what compression exactly)
> for a decent price do I buy that or do I really need to wait until I
> can specify the pistons for a higher compression?
>
> My current pistons are just some flat tops that I have no idea what the
> compression rating would be.
>
> My cam is a new comp cams 12-242-2
> int exh
> adv duration 268 280
> dur @ .050 224 230
> valve lift .477 .480
> lobe seperation 110
> the heads are the old style camel hump heads that were gone thru a few
> years back.
> my intake is your basic Edelbrock Performer RPM
>
> So, I will listen to anyones input on the "buy the unknown low
> compression motor for $400" or "wait til you can specify your
> compression"
>
> If I do buy the $400 motor, my new cam, lifters, valve springs, intake,
> heads will all go onto that bottom end.
>
> I want to get this noise issue resolved so I can have my 40 series
> flowmaster mufflers finally put on.
>
> Thanks Much.
>
> rick2950 at hotmail
>
I'd go straight to the tranny-to-block bolts & ensure they have not
worked loose. When they do, they make some weird noises--from lifter-like
to main-bearing sound-alikes. HTH & good luck, S


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