The dimensions of these valve covers are exactly the same as a stock Studebaker Cover. We assume you are asking because you want to mount them to a late model Small Block Chevy. This is something we are working on to convert this cover to work on late SBC. A few changes need to be made to the pattern before we can start production. Please follow us on Facebook and Instagram or check the website for an announcement on when this part will be available. Thank you for your question.