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Every engine that left the factory is balanced, if not they would all shake so badly the bearings would be toast in a very short order. The rods are numbered so you know where they go, as well as it`s helpful on the rod caps, they cannot be mixed unless the rods are resized.
A factory 305 never came with forged pistons, all the G engines came with flat top pistons, while the base engines came with concave dish pistons. Northern offers a "Cam kit" for this engine, however if you call them to make your order you can get any cam you want. Don`t go too big on the cam, as 305`s aren`t power monsters, I wouldn`t go over 210 duration @ .050, whichever cam you pick, make sure you get the matching valve springs. I`ve got all my kits from Northern as they always have quality parts. Last bit of advice, when you get your build done and are doing the cam break in, use diesel oil, this will prevent the cam from going flat, right after break in, change the oil and filter using standard oil. Instead of letting it sit a year, why not just wait to rebuild it until your ready? If not, then just give each cylinder a shot of marvel mystery oil before start up.
 
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