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10-17-2011, 10:42 AM
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#1 |
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Registered User
Join Date: Jun 2010
Location: Warman, SK
Posts: 16
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High pitch scream?
Hey guys got a 71 350 4bolt built up and when I take it up to 4000 or 4500 on the highway I can hear a loud very high pitch squeel or scream coming from the engine I can't figure out what would cause such a horrible noise but I'm very concerned!
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10-17-2011, 04:07 PM
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#2 |
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Junior Member
Join Date: Oct 2004
Location: Gatesville texas
Posts: 180
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Re: High pitch scream?
Mine does that at 7500 -7800 RPM and after putting a video in the truck I found it to be the driver.. LOL
I would check belts, alt, waterpump (if its mech) a belt will scream at you if its loose or not lined up right.
__________________
68 GMC 565 BBC Abruzzi super pro glide 9.85@135.00 
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10-17-2011, 05:31 PM
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#3 | |
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The One And Only !!!
Join Date: Jan 2007
Location: Hole in the woods Florida
Posts: 4,567
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Re: High pitch scream?
Quote:
 I've been known to do that too !  I'd agree with the belts etc.......
__________________
93 Jeep XJ 88 Buick La Sabra Toys; 88 TA-GTA in the works.... 97 GMC Ext. Cab 502 Crate 5 Spd......Sucks Gas But Haulz Azz !  The primary function of an Engineer is to make it difficult for the Fabricator and impossible for the Mechanic. "Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!
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10-17-2011, 09:31 PM
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#4 |
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Mean Green
Join Date: Sep 2007
Location: Portland, OR
Posts: 522
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Re: High pitch scream?
If its a metal sound it could be the thrust of the crank.
The flex plate hitting the starter teeth.
__________________
427 SBC 683HP & 590ftlbsTRQ @ fly wheel. 60'-1.38 1/4-10.43 MPH-124.6 New ET current 4/2019 AKA MEAN GREEN. |
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