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☼ny
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271 Posts
Discussion Starter #1
I had all the valves hit the pistons on one bank of the motor. Pistons are forged from DSS.

Here's the damage...


I've started sanding the notches with some emery paper. Question is how much do I sand off? Should I just get rid of the raised edges or sand em flat or somewhat in between those?
 

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Head Unicorn
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5,085 Posts
Just the raised edges to eliminate hot spots. Minor work will clean 'em up.
 

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☼ny
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271 Posts
Discussion Starter #3
Sweet...I was hoping thats all that was required. Done that on 2 pistons already. 2 more to go.
 

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Registered
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1,600 Posts
How did you wind up with ptv contact with notched pistons ? :dunno
 

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US Air Force (retired)
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13,542 Posts
I would have them checked for fractures before putting them back in a motor.
 

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☼ny
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271 Posts
Discussion Starter #6
lifter failed, a rocker fell off n got stuck between cam lobe and valve, cam locked up, cam gear sheared off the key way...$H!t broke....
It happened at low rpms while tuning for idle...shouldn't have fractured the pistons(being forged n all). Sent the head to Trick Flow n they gonna fix it up.
 

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Head Unicorn
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5,085 Posts
I would have them checked for fractures before putting them back in a motor.
Forged pistons won't suffer anything beyond cosmetic damage from a valve.
 
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