The best Christmas present

[tirebird]

With closed chamber LS6 109c.c. heads,..about 9.5:1.

[Kurt S]

The factory built the LS6 and the ZL1 and the L88 and the xxx, all with broached (not decked) blocks. Seems like they all ran fine like that, including your block.
Decking is kinda like a 4 bolt main. Makes you feel good, but really doesn't do much. In this case, I agree it is a big negative.

[JRSully]

you can resurface the deck and save the stamp by using a special bridgeport machine, your shop should know about it. Basically it swirl cuts up until you get to the stamping area and then flat/straight cuts it from there. They did it on my 70 L78 and it came out perfect. Good luck

[tirebird]

Thanks everyone. The builder is back in the shop this morning and I'll give him a call to discuss your suggestions. He agrees with me about leaving the stamping on the block. Thanks again.