Boat in the water is the best way.

Ok dropped the boat in today against my will!

To preface I have about 60hrs on the motor as is.

I idled to the dock 5-7 minutes at 700-750rpm and shut the boat down.

I assembled the necessary tools for a quick disassembly and then started the boat again.

I'm not sure if the Rayler 206 cam is enough to keep the IAC from a steady idle buts it's been a battle to get a smooth idle that doesn't seek from about 600-1000 out of gear. In gear it is rock steady at 700-750 rpm.

Anyway I squeaked the idle lower and lower until I got it to seek between 600-800rpm. About the best I could do. I shut it down with the rpm hitting momentarily as low as possible in the surge range at about 600-650rpm.

I quickly pulled the riser off and the manifold was bone dry, the stock riser was dry and the only hint of moisture was some mild "condensation level" amount of haze located in the bottom of my modified extensions. The vapor trail of moisture only extended partially about 9" up of the 18" welded extension leaving a buffer of about 9 inches plus the stock riser of water/exhaust separation.

So what is the consensus? Do you think I'm good to go? Install the CMIs and match the tails to the same length as these modified stock manifolds?

I read somewhere tubular headers have even more resistance to reversion that stock manifolds, is this true?

I can always bump the idle up another 100rpm as an additional buffer.


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Here is the manifold after idle, to my ignorant eyes there doesn't seem to be any traces of water or salt residue from evaporated water. Consensus?

Here is a better pic of the damp exhaust extension: