GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

Riddle me this...riddle me that...WHAT THE HELL IS TAPPING IN MY VALVETRAIN??

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Old Dec 2, 2005 | 03:22 PM
  #21  
ThunderZ28's Avatar
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From: La Porte Tx
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change out the cam you should change out the lifters..
you can put new lifters on an old cam, but not a new cam on old lifters..
they will collapse expecially if it has a violent ramp rate....

swap out the lifters, and it will fix your problem..
I had the same exact thing happen to mine..
loud tapping coming from the drivers side..
would gradually get worse, and then when I dropped into a lower gear it would get oil in to the lifter, and go away, but it was everyonce and a while at first. then it got so bad it did anytime I got in it...
finally swapped the lifters, and havnt heard it since..
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Old Dec 2, 2005 | 03:28 PM
  #22  
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From: Phoenix, AZ
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ok cool i will do that with the new motor then.
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Old Dec 2, 2005 | 03:30 PM
  #23  
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From: Hackensack, NJ
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Are the Comp OE replacement lifters any good? I usually see them for under $200. Melling also makes lifters for the GenIII...between $160-$170 from what I've seen. Pretty sure that you'd need a second mortgage for factory ones
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Old Dec 2, 2005 | 04:48 PM
  #24  
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From: La Porte Tx
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Originally Posted by budhayes3
Are the Comp OE replacement lifters any good? I usually see them for under $200. Melling also makes lifters for the GenIII...between $160-$170 from what I've seen. Pretty sure that you'd need a second mortgage for factory ones
I just put a set of the comp lifters in mine..
so far no problems...
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Old Dec 2, 2005 | 05:19 PM
  #25  
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From: Austin, TX
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Comp Performance replacements here had the good ole lifter tick in my lil engine. COmp makes two different ones the factory replacements and the "preformance" ones they are like 15 bucks more. Dont ask me the difference cause I dont know.
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Old Dec 8, 2005 | 10:57 AM
  #26  
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From: Ms
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Are you tightening the rocker arm bolts in there sequence at TDC of the compression stroke? For example rotate the crankshaft untill number one piston is at top dead center of the compression stroke. In this position, cylinder number one rocker arms will bo off lobe lift, and crankshaft sprocket
will be at the 1:30 Position. Tighten 1,2,7 and 8 exhaust valve rocker arm bolts to 22 lb ft. Tighten 1,3,4, and 5 intake valve rocker arm bolts to 22 lb ft.
Rotate the crankshaft 360 degress. Tighten cylinders 3,4,5 and 6 exhaust valve rocker arm bolts to 22 lb ft. tighten cylinders 2,6,7 and 8 intake valve rocker arm bolts to 22 lb ft.

Ive seen rocker arm bolts back out, if not done in the proper sequence.

Doug
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Old Dec 8, 2005 | 11:34 AM
  #27  
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From: Texas
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Originally Posted by fossil
Are you tightening the rocker arm bolts in there sequence at TDC of the compression stroke? For example rotate the crankshaft untill number one piston is at top dead center of the compression stroke. In this position, cylinder number one rocker arms will bo off lobe lift, and crankshaft sprocket
will be at the 1:30 Position. Tighten 1,2,7 and 8 exhaust valve rocker arm bolts to 22 lb ft. Tighten 1,3,4, and 5 intake valve rocker arm bolts to 22 lb ft.
Rotate the crankshaft 360 degress. Tighten cylinders 3,4,5 and 6 exhaust valve rocker arm bolts to 22 lb ft. tighten cylinders 2,6,7 and 8 intake valve rocker arm bolts to 22 lb ft.

Ive seen rocker arm bolts back out, if not done in the proper sequence.

Doug
The Crane/VHP rockers have their own (lengthy) method of installation and use studs instead of bolts. http://www.vincihighperformance.com/...TRUCTIONS.HTML
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