Truck came in for heads and this happened.....

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So we had a truck come into the shop and it needed a set of heads. Installed the heads with new gaskets along with headstuds and now it doesn't want to run. Showing low compression in 2 cylinders. Checked all the pistons and no cracks. Anyone ran into this problem?
 

04stroker

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Wow that is crazy. Never heard of such thing. If your sure its losing compression through the exhaust valves and you have tried 2 new OEM fully dressed heads would almost have to be something holding them open. That is a strange one for sure.
 

TyCorr

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How do two heads do the same exact thing. Is there packing in the heads to keep those valves in? Im not able to picture a 6l head right now but there cant be two new heads effed up. The lifters have to be. As stated...
 

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