I NEED ADVICE

Discussion in 'High Performance Modifications' started by Josh M, Jun 28, 2020.

  1. Josh M

    Josh M New Member

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    I just installed a new cam and lifters and after the initial break in period two lifters were completely destroyed and also destroyed the new cam and my rocker arms. What would cause this to happen?

    Cam- Comp Cams 12-214-4
    .525/.525 lift 305/305 duration

    Lifters- Comp Cams 858-16

    Rockers- PRW 1.6 roller rockers

    Heads- BPE H8002K
    .575 max lift

    PICTURES ARE ATTACHED BELOW
     

    Attached Files:

  2. tom3

    tom3 Veteran Member

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    Couple things. Coil bind on the springs, or guide clearance. Maybe caused by the high ratio rockers. Or too long bolts in the intake manifold. Doesn't look like a bad cam or failure due to oil type. Serious damage there.
     
  3. Josh M

    Josh M New Member

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    Well this only happened with two out of 16 all the rest of them were fine. I’m wondering if possibly I received bad lifters or maybe adjustments weren’t right. Someone also told me I should have been running guide plates.
     
  4. tom3

    tom3 Veteran Member

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    Those Blueprint aluminum heads should have guide plates included?
     
  5. Josh M

    Josh M New Member

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    I bought them off of my buddy when he bought the crate motor they came on they did not have guide plates on them, they have stamped self aligning rockers. After I started having issues I replaced the rockers thinking that was the only thing damaged. I replaced them with standard comp cams 1.6 roller rockers and guide plates
     
  6. 76z28

    76z28 Veteran Member

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    So did you run those PRW rockers with guide plates? If not, that was your issue.

    Otherwise, that was coil bind/piston hitting a valve.
     
  7. Josh M

    Josh M New Member

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    I didn’t run them with guide plates and neither did he, they are supposed to be self aligning roller rockers which people say you don’t run guide plates with
     
  8. Scaleytail

    Scaleytail Veteran Member

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    Did you measure for push rods?
     
  9. 80NastyZ

    80NastyZ Veteran Member

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    Coil bind on the springs , retainer to guide problem .

    There is some sort of valvetrain geometry problem going on there as you can see the rocker hit the spring/retainer at some point . (Pushrod too short)

    Those are a self aligning rocker / no guide plates needed .

    Did you calculate and measure for spring coil bind height ? How much retainer to guide/seal clearance was there ?

    Piston to valve clearance was ?

    What method and how were the pushrod lengths calculated at ?

    How did you set lifter preload ?

    My guess , Valvetrain geometry issue from the start , pure coincidence it only took out two , if there was more time the rest would have followed.

    TOM
     
  10. 1320feet

    1320feet Member

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    I'm thinking coil bind. What is the valve spring part number? I'm pretty sure the rocker arm damage came after the lifter failure.
     

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