Do they fit Oldsmobile 3800 series 2 heads to 98 camaro series?
No, Oldsmobile 3800 Series II heads will not fit on a 1998 Camaro engine. The 1998 Camaro used either a GM LS1 (small-block V8) or an LT1 (small-block V8), depending on the trim level. The Oldsmobile 3800 is a completely different engine family (a Buick V6) with a different cylinder head bolt pattern, valve angle, and overall architecture. They are not interchangeable.