I am replacing the OEM manifolds on my twin 1990 454 Magnums with EMI Thunder Manifolds. The OEM has 2 supply lines - one to the manifold and one to the riser and EMI only has one. I don't necessarily want to spend $200 - $400 on new housings to remedy this but am not a huge fan of simply sticking a wye in the system either. Anyone know of any cheap alternative or have a cleaver idea to solve this?? Thanks!!

eBay.

I have looked on ebay but I am an outboard guy - these are my first I/O's. So I am not very knowledgable about what may fit and what will not. From my perspective - it appears that the Mercruiser housings from most v-8's and v-6's, at least the 350 thru 454's are the same. If I simply buy a four outlet housing it will mate directly to my motor. Is that correct or can someone give me some dorection on that? Thanks

If it is raw water cooled this is the one I used.

http://www.ebay.com/itm/Mercruiser-7...05%26rk%3D1%26

This one is new and a better deal IMHO.
http://www.ebasicpower.com/pc/BARCHV-29-80/MER8B

Got it - Thanks!!!!

michigan motorz has a polished one also the one i use is stainless marines