Piston hit valve

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Apr 1, 2009 | 01:37 AM

PwrdbyLS1

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Piston hit valve

I currently doing a Head/cam swap and I saw that my piston #7 hit the intake valve. I don't understand because the car was running great before and the valve don't seem to be damaged at all. So maybe the previous owner had some problems and replaced the valve. When I bought the car, the engine was stock(manifold, lid, ls1 intake)

So what do you think??
I supposed that all I can do now is to grind the excess of material on the top of the piston.

Apr 1, 2009 | 01:48 AM

Sharpe

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I'm no expert, but I'd say if the valve looks good then **** it. Call it a war wound and get back in there.

Apr 1, 2009 | 01:49 AM

Soul TKR

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what's your mileage and what springs do you have?

Apr 1, 2009 | 05:41 AM

1bdtrk

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From: Currently, Zormat, Afghanistan....Home staion, FT. Richardson, Alaska

It will be fine, just dont put stock springs back on. Trust me on this, I know from experience. Except if you were to look at mine, all 8 pistons have 2 of those marks. Something about shifting from 3rd to 2nd at 6k that does that. I ruined a head, valve, and all my pushrods but needed back on the track quick so i went with some stock 5.3's, Z06 springs and some chromemoly pushrods and turned out a 12.90 @ 104, the best time ive ever ran actually.

Apr 1, 2009 | 06:41 PM

PwrdbyLS1

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The car have 63k with stock valvetrain, I'm putting PRC 5.3L stage 2.5 with springs now so i'm not worried, the valve will not hit again. I Hope !

Apr 1, 2009 | 06:45 PM

samson_420

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This was most likely repaired in the past.

If the valve is not bent now, it was reapired. . . . .

I still have not found valves that will bend them selves back after a run in with a piston dome.

Apr 1, 2009 | 07:27 PM

DaveX

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From: Lexington, KY

Quote:

Originally Posted by samson_420

This was most likely repaired in the past.

If the valve is not bent now, it was reapired. . . . .

I still have not found valves that will bend them selves back after a run in with a piston dome.

I agree. There is no way the valve did that much damage to the piston and didn't get bent. Had to have been fixed before. Your an M6, most likely it was from a missed shift by the previous owner and he had it fixed. I would just clean it up a little, it should be fine. Get a small stone and work it down flat again.

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Apr 1, 2009 | 08:52 PM

JFM-jr

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From: Mastic Long Island N.Y.

Quote:

Originally Posted by DaveX

. There is no way the valve did that much damage to the piston and didn't get bent. Had to have been fixed before. .

Agreed without question it was repaired. Thats gotta be over 20 thous. into the piston and there is not a valve in existence that would walk away from that. If it ran good when you took her apart she should be good to go when it's buttoned back up. As stated i'd clean the burrs off on the edge and smooth it. Could create a potential hot spot, tape the cylinder bore around the edge to keep any filings out from between the piston and cylinder wall.