Thanks, Alex told me a possible reason for engine sounding sick when I bring it back to idle is because the O2 sensor got wet which made the computer add a bunch of fuel down low. Other than that data logs looked good.Going to check compression tonight.

Good luck, hope it's a simple fix.

#1 = 152psi #2 = 152psi
#3 = 140psi #4 = 152psi
#5 = 140psi #6 = 60psi
#7 = 100psi #8 = 155psi

Looks like 6&7 got some issue. Good luck.

Commanded is actually 11.8 at 7#'s, and timing is 31 at IAT's below 110 degrees, and then it will start pulling timing gradually if air temp climbs.

Alex Haxby has been a great help even though my problems have nothing to do with the Holley system I purchased.

I'm thinking head gasket on one side, tuliped valve on the other...there was not way water got back up thru exhaust when slowing down was there ?

So if it has 380 hours, does it still have stock head gaskets? I always change them when putting a blower on because the stock gaskets just can't take the added cylinder pressure. I would put the starter on and get the water out then start it, as others have said.

Yes Stock HeadGaskets. According to the people I bought the boat from the motor has never been opened up. I cranked all the water out and oiled it up good yesterday.

99.9% sure no what went in the motor through the exhaust when slowing down.