--- title: What Bore Size Should I Choose For My BluePrint Engine Block? description: Learn how to select the proper bore size for your BluePrint Engine Block and understand how bore size affects displacement, durability, and overall engine performance. --- [Skip to content](https://knowledgebase.blueprintengines.com/knowledge/what-bore-size-should-i-choose-for-my-blueprint-engine-block#main-content) English Show submenu for translations ![IN CRATE ENGINES..png\]](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/IN%20CRATE%20ENGINES..png?height=40&name=IN%20CRATE%20ENGINES..png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.blueprintengines.com Go to www.blueprintengines.com How can we help you? - There are no suggestions because the search field is empty. 1. [Knowledge Base](https://knowledgebase.blueprintengines.com/knowledge?hsLang=en) 2. [Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/engine-specs?hsLang=en) # What Bore Size Should I Choose For My BluePrint Engine Block? ## One of the most common questions engine builders ask is whether they should choose a standard bore block or increase bore size when planning a build. The answer depends on your displacement goals, intended use, and the amount of material available in the block. ### ***What Is Bore Size?*** Bore size refers to the diameter of the cylinder. Increasing bore size can: - Increase engine displacement - Improve airflow potential - Increase horsepower potential - Affect piston selection - Influence future rebuild options Why Not Bore The Block As Much As Possible? While increasing bore size can add displacement, excessive boring can reduce cylinder wall thickness. --- Maintaining adequate cylinder wall thickness is important for: - Block strength - Ring seal - Durability - Bore stability - Cooling system performance The goal should be to use the smallest bore required to achieve the desired engine combination. --- ### ***Is A Larger Bore Always Better?*** No. The ideal bore size depends on: - Engine family - Stroke length - Intended horsepower level - Racing class requirements - Future rebuild plans Many successful race engines are built using conservative bore dimensions to maximize durability. --- ### ***How Does Bore Size Affect Displacement?*** Engine displacement is calculated using: - Bore - Stroke - Number of cylinders Even small changes in bore size can increase displacement when multiplied across eight cylinders. Should I Consider Future Rebuilds? Yes. Many racers intentionally leave material available for future rebuilds. Benefits include: - Additional rebuild options - Longer service life - More flexibility for future engine refreshes --- ### ***Does NHRA Competition Affect Bore Selection?*** It can. Certain classes may have displacement limitations or combinations that influence bore and stroke selection. Always verify current class requirements before finalizing your engine combination. What Else Should I Consider? When selecting a bore size, consider: - Intended horsepower goals - Compression ratio - Piston availability - Block specifications - Future displacement plans - Intended fuel type A complete engine combination should always be considered rather than focusing on bore size alone. --- ### ***Frequently Asked Questions*** ### Will a larger bore make more horsepower? A larger bore can increase displacement and airflow potential, but horsepower gains depend on the complete engine combination. ### Is the largest possible bore always recommended? No. Durability and long-term reliability are often more important than maximizing bore size. ### Can I increase bore size later? Possibly. Leaving material available for future machining can provide additional rebuild options. ### Should I plan my bore size around my displacement goal? Yes. Bore and stroke should always be planned together to achieve the desired displacement and performance characteristics. - [General Support](https://knowledgebase.blueprintengines.com/knowledge/general-support?hsLang=en) - [Technical Support](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#main-content) - [General Engine FAQ](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#general-engine-faq) - [BluePrint GM Style Engines](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#blueprint-gm-style-engines) - [BluePrint Ford Style Engines](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#blueprint-ford-style-engines) - [Transmissions](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#transmissions) - [Fuel Systems](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#fuel-systems) - [Parts and Accessories](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#parts-and-accessories) - [Carburetors](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#carburetors) - [Alternator](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#alternator) - [Term X](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#term-x) - [Valve Train](https://knowledgebase.blueprintengines.com/knowledge/technical-support?hsLang=en#valve-train) - [Factory Five FAQ](https://knowledgebase.blueprintengines.com/knowledge/factory-five-faq?hsLang=en) - [Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/engine-specs?hsLang=en) - [Discontinued Engine Specs](https://knowledgebase.blueprintengines.com/knowledge/discontinued-engine-specs?hsLang=en#main-content) - [Engine Support](https://knowledgebase.blueprintengines.com/knowledge/discontinued-engine-specs?hsLang=en#engine-support) [![Chill listening crop-3](https://knowledgebase.blueprintengines.com/hs-fs/hubfs/IN%20CRATE%20ENGINES..png?width=92&height=24&name=IN%20CRATE%20ENGINES..png "Chill listening crop-3")](http://navy-blueprint-logo) www.blueprintengines.com Help Center Copyright © 2026, BluePrint Engines