Loud air sucking noise on acceleration

[Asshat]

Originally Posted by AcampoDave

I'm mostly a sb V/8 guy but I seem to recall that some 292's came with an exhaust manifold that had a 2.5 outlet. Be cool to fine one of those and then you'd be set for 2.5 inch pipe without the restriction at the outlet.

Pretty sure mine is 2.5”, it is the 3-bolt clamp.
The header pipe end I found on eBay is 2.5”.