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Replacing port exhaust manifold 4.3 Ll MPI w/1.70" riser sn OW662173

P

ppitx

New member
When installing the new gaskets on top and bottom of riser, does the Restrictor Gasket go on top? Which way does the small hole face, bow or stern? Or does it not matter? This one has the Dry Joint system.
 
It matters, Didn't the gaskets come with instructions?:confused: I thought they did for some reason, This should help you out.;)


Apply Perfect Seal (92-34227-1) sealant to the edge of each of the 4 water ports located on the risers
Gasket Application
Full Flow Gasket
IMPORTANT: Full flow gasket is not used on engines without risers.
IMPORTANT: On warm riser models, the full flow gasket must be placed between
exhaust manifolds and riser.​


Passages fully open​


Turbulator oriented up​

Restrictor Flow Gasket​

IMPORTANT: Restrictor gasket must be used on all SEAWATER COOLED engines.​


IMPORTANT: On warm riser models, the restrictor gasket must be placed between the riser and the exhaust elbow.​


IMPORTANT: The restrictor end of the gasket must be positioned to the seawater inlet side of the exhaust elbow. On seawater cooled models only: ​


Place the restrictor gasket on the riser with the side
​
​
marked “UP” visible. Ensure that the restricted water port of the restrictor gasket is on the same side as the hose fitting of the exhaust elbow.​
​



Full flow passage​

Restricted flow passage​

Turbulator oriented up​


Block-Off Gasket​



IMPORTANT: Block-off gasket must be used on all CLOSED COOLED engines.​




IMPORTANT: On warm riser models, the block-off gasket must be placed between the riser and the exhaust elbow.​





a- No opening for water flow
b- Turbulator oriented up​

P.S. your engine serial number does not show it to be a MPI.
It's a 4.3L = carburetor (TKS) Turn key start.​
 
Last edited:
Excellent, very helpful. Gasket came with no instructions. You are correct, my engine is regular carb, not MPI. Thanks
 
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