Originally Posted by matt167
GM used factory TBI adaptors for 4bbl manifolds on the earlier 454's. Holley makes the same adapter.. Holley #17-45. Have EGR tuned out, or get '96-'98 manifolds and EGR tubes. It's a common swap.
I have a set of '97 Vortec exhaust manifolds and the EGR supply piping for photos if needed. Headers could be plumbed too, I suppose. The OEM parts would make life easier, though.
The casting number of the left manifold w/the EGR tube fitting is 24673
. The right is c/n 24172