Wrong Exhaust Manifold!

[Colsanders1955]

I am rebuilding a 1988 Mercruiser 5.7L that had a cracked block and two cracked exhaust manifolds. I bought one years ago (never got around to replace it) and just found a second one cheap from an individual (after getting sticker shock on a current new one). Upon installing it I am chagrinned at seeing it is different from original. It has a rounded port and two open holes in front and back of the main port that are not threaded (see attached). I know I'll have to break down and buy an expensive new one but wish to sell this one if I just knew what years/engines it fits. Any advice?

 

[Bondo]

Ayuh,.... The 1st one is the newer dry joint manifold, 'n the 2nd is the older wet joint manifold,....

 

[Lou C]

The dry joint is a better albeit more expensive system. I’d go with that for sure!

 

[Lou C]

If you don’t want to pay for Merc OE then try Barr Marine aftermarket. I used em on my center riser conversion & it worked out great. No leaks fit like factory.