How much can you bore a 1977 305 Chevy?

A 1977 305 Chevy small-block can generally be bored safely to around 0.030" to 0.040" overbore. Going beyond that significantly risks weakening the cylinder walls and requiring extensive machine work to maintain structural integrity. Some machine shops might be willing to go a little further, but it's pushing the limits of what's considered safe and reliable for a stock block.

Important Considerations:

* Cylinder Wall Thickness: The actual safe overbore depends on the condition of your specific block. A block with thinner cylinder walls from wear or previous machining will have a lower safe overbore limit. A professional machine shop will measure this precisely.

* Piston Selection: The overbore size dictates the piston size you'll need. You can't just bore it and use the original pistons.

* Connecting Rods: Depending on the overbore and piston choice, you might need to consider connecting rod length. A longer stroke with a larger bore could require new rods.

* Machine Shop Expertise: A reputable machine shop is crucial. They'll assess your block's condition and advise on the maximum safe overbore.

In short, while a .060" overbore is possible in *some* cases, it's risky and not generally recommended for a stock 305 block. Sticking to the .030"-.040" range is the safer and more practical approach. Always consult with a qualified engine builder or machine shop before undertaking any engine boring.