美国采购需求：气缸体、气缸盖定制、柴油发动机气缸体、柴油机气缸体、成品变速箱壳体、差速器定制

I'm interested in your capabilities regarding custom-designed V8 block engines. Specifically, I'd like to know if you offer the option to use iron as the primary material for the engine block instead of aluminum. It's crucial for my project to have durable components that can withstand higher levels of stress and heat. Additionally, I would appreciate details about any design flexibility you have. Are there specific modifications or features you can incorporate to enhance performance or efficiency in this type of engine? Understanding your production capabilities and any potential limitations will help me make informed decisions moving forward. Looking forward to your response!