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N8N wrote:
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<pre wrap="">John Smith wrote:
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<pre wrap="">i am looking at an antique truck. The original engine was
replaced with a
Chevy 350 crate engine. Otherwise it looks original. Problem is, when you
start the engine it sounds like a hot rod -- throaty muscle car type of
sound. I want a sedate old car sound. My question -- is this sound simply a
funciton of the muffler? Could I tone it down by changing to a different
muffler? Or is this engine sound due to the engine, and no muffler is going
to change it?
thanks
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Depends on what you find objectionable about the sound. If it's simply
the volume, then yes changing the mufflers will help. However you will
have to seek the advice of a GOOD muffler guy as most aftermarket
mufflers are aimed at the "performance" crowd who value low
backpressure over quietness. Stay away from "turbo" mufflers,
glasspacks, and Flowmasters or imitations thereof. They sound good,
IMHO, but aren't what you seem to be looking for.
Alternately, you could run a glasspack in series with the existing
mufflers, if they're "turbo" style or similar. This will yield a deep,
throaty sound without a whole lot of volume. Also adding a balance
tube, crossover, H-pipe, whatever you want to call it, will mellow out
the sound without any performance hit.
If what you dislike is the lumpy idle due to a performance cam (which
crate motor are we talking about, anyway?) there's really not much that
can be done short of installing a milder camshaft, which IMHO isn't
worth it.
good luck,
nate
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From the OP...this is an "antique truck". Can we assume there's little
or no sound insulation material around the cab area? When you "start
the engine it sounds like a hot rod". Does the sound diminish/go way
after startup? Is the sound acceptable after startup? Are there
headers or the stock exhaust manifolds? Do you care what it sounds
like outside the cab (i.e., what others hear, but not you)?<br>
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