Duramax rebuild. problem with exhaust valves

[rungesco]

I am rebuilding a lb7. when i turn it over it turns over smooth intil i install the rocker arms. on every cylinder the exhaust valves hit. none of the intake valves hit. it is times so that the single dot on the cam in in the center of the two dots on the crank, at number one top dead center. any ideas or insight on this would be great thanks

 

[S Phinney]

Are you running a aftermarket cam? Are you running stock rockers? You sure the marks are lined up? Give more info on the build please.

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[rungesco]

sorry everything is stock and yes the marks are definetly lined up

 

[delong_1]

How much was the block decked which head gaskets?

 

[rungesco]

didnt have to take anything off and the head gasket is standard thickness and it said that it works with a, b, and c

 

[02dirtymax]

#1 TDC intake or exhaust stroke?

 

[rungesco]

im not positive im posting this for my buddy he doesnt have a computer handy. will it be off if it is timed on one compare to the other?

 

[02dirtymax]

Yes. You will have rockers that are really loose and some that are really tight

 

[rungesco]

Ok let me call him and make sure that he had it right. it has to be on exhaust stroke correct?

 

[02dirtymax]

I don't remember which one it is off the top of my head

 

[02dirtymax]

Made that mistake once after doing head gaskets...... Suprisingly enough it runs pretty decent, just makes alot of noise, especially once you throw a pushrod.

 

[02dirtymax]

http://www.duramaxdiesels.com/forum/showthread.php?t=6149&highlight=valve+clearance+adjustment

Look at this

 

[rungesco]

It does this with all the valves adjusted out as far as they will go

 

[JoshH]

Have you pulled the cam gear to make sure the alignment pin isn't broken?

 

[rungesco]

No he hasn't i will tell him to check that today.