gen 4 454 420hp HO
 

I have purchased two remanufactured zero hrs 454 420 hp motors, They came out of barefoot Nautiques. I am told they are a rare engines.

They are going into a redone 84 Scarab 2, looking for advice for exhaust manifolds. I have rebuilt BW's it's a TRS set up. Any info would be appreciated.

Not rare. They were in a lot of 80's performance boats. My TRS Scarab Panther (Scarab 2 performance version) has them in it. I did upgrade to hydraulic roller 500 EFI cams. And you can't go wrong with Stainless Marine manifolds and tails.

https://cimg3.ibsrv.net/gimg/www.off...c81602d21.jpeg

Wow your motors look great, those are the exact manifolds and tails that I am looking for. Thanks for the reply.

The Stainless Marine exhaist manifolds will also typically fail by leaking out on the exterior jacket, vs inside into the exhaust ports.
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They have lots of options for risers and tails.