[oldman]

I thought like you too, but this engine puts our 530 BHP which is roughly where the 426 hemi, the 427 L88 were, both these engines liked a minimum of 2" primaries (actually 2 and 1/8 was minimum if you could fit it in the car... just saying). So even my conservative choice of a 1 and 7/8 bone stock long block was just that a conservative choice. The only good thing about the 1 and 7/8 header is there is more room less steering shaft / burned wire issues. I still have my stock wires correctly and carefully routed. That said the 2" would seem not to have any power loss and produce a tad more top end power even with just a bolt on engine. I don't regret my 1 and 7/8 would do it again, even though my current build would luv 2"