I'm building a 500" stroker motor for an A-body strip/street car, using a 440 Source rotating assembly with dished pistons and ported '906s. After cc'ing, I've found my compression ratio will be 9.5:1. I'd like to have more. Ideally, I'd like to be around 10:1. The easiest way for me to get there would be to mill the heads. I can't run a thinner gasket, since I'm flush decked and need to leave some safety clearance. Anyhow, I currently have about 0.075-inch between the gasket surface and the quench pad (the chambers are 82 cc's}. I don't think much has been taken off the gasket surface so far. How much can I take off safely without running the risk of head warpage?