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Have to? No. But consider the origin of the "new" injectors. Manufactured anytime between 1968 and 199?. In storage here and there and not looked at for decades. From the factory ready to be dropped in - but that was decades ago. The lubricant could be hardened, they can be stuck, who knows...

If you replace single injectors, replace like with like. Don't mix single hole and two hole injectors unless it is an emergency to get you home. The two hole injectors superseded the single hole injectors for less smoke and less chance for piston damage (melting). Personally, I ran both and...