tom'sB2B Posted March 27, 2018 Report Posted March 27, 2018 I received my valves and guides from Terrill machine today. I want to understand counter-bore up vs counter-bore down. I received a box of intake and exhaust guides. What’s the diff. and how are they installed. They all look identical to me. Explain! Quote
Branded Posted March 27, 2018 Report Posted March 27, 2018 Look inside the bore and you’ll see the counter bore on one end, the other end will be a smooth bore. Quote
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