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Old 06-27-2007, 02:41   #1 (permalink)
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confused Help!!!

i have a 351 cleavand. just bought the car and it keeps snapping cam lobes with in 10 minutes of running after instalation. any idears on what it could be???
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Old 06-27-2007, 04:37   #2 (permalink)
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Re: Help!!!

It could be many many things.

Your better off telling us how are you running it in first, also, what type of valve train gear are you using - Solid/hydraulic lifters, standard/roller rockers?
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Old 06-27-2007, 17:33   #3 (permalink)
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Re: Help!!!

exactly mental, what brand cam? what is open spring pressure, I have had and heard of crane doing this, is it splitting the lobe or shearing in the middle. side ways? more info please. GEo
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Old 06-28-2007, 05:31   #4 (permalink)
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Re: Help!!!

i dont know a great deal about the engine. its running a comp cam hydraulic lifters with standard rockers. i am a diesel mec apprentice so yeah i am very new to petrol. I am in the process of changing the valve springs messuring the lift and piston to valve clearance. i did notice that there is a 90 tho shim under only one of the valve springs and i have a feeling that the vavle springs are not suited to the engine. Is it true that if there is a problem with the valve spring tentions and if it may be bottoming out it would destroy a rocker before the cam lobe?? and is it true that 240 to 280 is the correct vavle spring pressure for a clevo???

thanks
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Old 06-28-2007, 05:32   #5 (permalink)
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Re: Help!!!

dont know a great deal about the engine. its running a comp cam hydraulic lifters with standard rockers. i am a diesel mec apprentice so yeah i am very new to petrol. I am in the process of changing the valve springs messuring the lift and piston to valve clearance. i did notice that there is a 90 tho shim under only one of the valve springs and i have a feeling that the vavle springs are not suited to the engine. Is it true that if there is a problem with the valve spring tentions and if it may be bottoming out it would destroy a rocker before the cam lobe?? and is it true that 240 to 280 is the correct vavle spring pressure for a clevo???

thanks
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