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Old 08-14-2011, 11:53 AM
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buick 455 really loud clicking nosie

hye im a kid of 18 and know somewhat about cars but not alot, but i recently pick up a 1973 buick rivera 455 buick big block. i got it on the road a mounth ago and just the otehr day its started a clicking sound while i was driving down the road and sounded like a deisel truck form inside and then my car was reving high rpm's just to go in town limit speeds, 30 mph, cuz my dash is in mph and then it was almost like a loss of power and my oil light kept flickering and then finally stayed on , got i towed to my fiends house went home started it up the other day and it was click loud i gave it a shot of gas and it went away. so i drove it home and asoon as i hit the drivway my oil light cam on and started clicking again and now i have the valve covers off i noticed that some pushrods spin and some dont and also only 2 push rods squirt oil out and one ozzes oil out and the others dont shoot oil out the top or anyhting. are they all supposed to spin and shoot oil? like i said i dont know much about motor,s just a little. i took out all the pushords out, cleaned them up and oiled everything up real good. it seems like the clicking sound is coming from the lifters. it sounds like all the lifters are clicking. i have the right amount of oil in the engine. if i give it a good rev, the sound goes away and then comes back 10 seconds l8ter.

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Old 08-14-2011, 01:46 PM
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Check your oil pressure with an accurate mechanical oil gage.
Sounds like your oil pump may be failing, so this is the first thing to check.

Have you checked the trans fluid level, if its low the trans will slip and cause the engine to rev higher to maintain speed.

Is your trans shifting thru all 3 gears, you might not have the vacuum modulator hooked up and the trans is not shifting correctly.

Good investment would be a GM Chassis Service Manual for your car. Not Chiltons or Haynes, GM, the same ones they used in the dealership when your car was new. Check Ebay.
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Old 08-14-2011, 02:53 PM
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Those Buicks had a really bad oil pump design. Not so much the design, but what they made it out of. Aluminum timing cover. Good luck
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