i really reccomend stepping away from this motor and biting it now before the customer trys screwing you guys.... i've been working in shops since i was 16 and i've seen quite a few lawsuits from customers that pull cheap BS like this.... ussually ends up in the owner losing the shop and all the employees loosing their jobs.... the LS1 is a very tight spec motor, and its really easy to mess one up..... the engine shouldn't even built if every thing is either new or remachined for proper spec..... the rings especially..... they are supposed to hold 100% compression even when cold