What could it be? Pics inside
Do some of the Phamspeed kits require specific shorty headers?






Now look at these headers. Notice how the passenger side collector flange starts directly under the last cylinder and points at the 3rd exhaust port.
The difference on the Edelbrock headers is for the different years. The 98-99s had the extra pipe and different passager flange so they could eliminate the small pre-catalytic converter on those cars. In 2000, the cats moved to right after the manifolds so that pipe wasnt needed. So if you phamspeed kit was make for a 00+ manifold, you need 00+ headers. This goes regardless of header brand too as the flanges are in different locations for the different years.
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From Top to Bottom
98-99 Camaro/Firebird (top)
00-02 Camaro/Firebird (second from top)
99-03 Silverado (second from bottom)
’97-’03 Corvette (bottom)


