I have a Bronco Now

How do i tell wich engine i have 302 or 351 i am stumped and feel reterded?

iT'S hard to tell, even if you know what you're doing. My buddy swore his old 67 Mustang had a 302 in it, turns out it was a 289.

I don't know how you could tell if you don't have another one there. Words like 'bigger' don't really apply. Does your truck still have it's sticker in the engine bay? (That's the most sure-fire way to tell.) There is also the VIN, located in the window.