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I am actually taking the block to a machine shop today just for measurements. Cylinder straitness/roundness as well. Those main bore specs will be exremely helpful.
OK, the good news first. I turns out the cylinders are straight and round. The two worst cylinders were off by a max of .0002 in one dimension or the other.
The bad news. The main bores are sitting at 2.9386. This is .0026 under the minimum provided by Rob. And explains my lack of clearance. Block will be going back to the machine shop and will set my build back by probably 3 weeks.
I'm glad that is squared away Brian. Rob has been into FEs real big for a long time. I'm glad he stops by every once in a while and shares some knowledge.
Rob has given me valuable information on more than one occasion, both on the internet and the phone. In fact, I bought my Canton oil pan and my Erson rockers from him.
The main bore specs he provided made it possible for me to nail the machine shop as the culprit.
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