world block problem

A buddy of mine is building a stroker using a new iron world block. The motor is almost finished but the shop is running into a problem. It seems the cam gear is hitting the timing chain cover. He tried several different covers with all the same results. They tried double gaskets and still no luck. Everything is lined up internally as well. Anyone else ever hear of this happening?

Is the cam walking forward? I had a big problem with that. Had so much forward thrust I wound up with a geardrive, and a pressure oiled thrust button.

The only thing I can think of is the surface that
the timing cover bolts to was machined down too far,
since you tried multiple covers and they all did the
same. I assume all the lifters line up on the cam
properly and the timing gear isnt forward

Everything is lined up on the cam. And the timing gear seems to be in the correct place. I was wondering about the surface being machined to low as well.

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Is the cam walking forward? I had a big problem with that. Had so much forward thrust I wound up with a geardrive, and a pressure oiled thrust button.

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If everything is lined up, could it still be too much forward thrust. How does he check this?