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Thread: GTO rocker arm broke
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09-27-2008, 03:32 PM #1
- Join Date
- Jul 2008
- Location
- orange,texas
- Posts
- 5
blue- 2006/ GTO
GTO rocker arm broke
Today I installed a mild Patriot cam (580 lift)with Crane 7.4 push rods and PSI LS1511ML springs there specs are :
Outside Diameter Bottom - 1.260"
Inside Diameter Top - 0.630"
Seat Pressure @1.800" (installed height) - 120#
Open Pressure @ 1.175" - 360#
Spring Rate - 384 # per inch
Maximum Lift - .625"
Coil Bind - 1.100"
Valve train is noisey and I broke a stock lifter in half with in the first 5 miles. These springs are supposed to be close to the crane 918 ( I thought ).
Any ideas ?
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09-27-2008, 04:42 PM #2
Are you sure the timing chain was install correctly ? A tooth off can cause the valves to hit the pistons and cause that kind of damage.
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09-27-2008, 11:29 PM #3
- Join Date
- Jul 2008
- Location
- orange,texas
- Posts
- 5
blue- 2006/ GTO
The cam was installed right on the money. sounded great, in fact it ran like a bat out of hell.
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10-10-2008, 02:08 PM #4
- Join Date
- Jul 2008
- Location
- orange,texas
- Posts
- 5
blue- 2006/ GTO
problem solved I recieved ls7 springs by mistake. problem coil bind.
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10-10-2008, 03:45 PM #5
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10-12-2008, 04:44 PM #6
- Join Date
- Aug 2005
- Location
- Texas Department of Corrections
- Posts
- 18,128
- Retired Outlaw Sum Bitch
I thought I was the only one that did shit like this. I tried like a bitch to get a timing chain on a pickup one time all damn afternoon....just to find out it was the wrong one....
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