getrdunn

iTrader: (7)

Pressure test your manifolds for leaks. There are a ton of those cams running out there without dry pipes even without any issues. Personally I'd pull them and go through them.

mike tkach

iTrader: (3)

imo,that cam with true dry exhaust should not be the cause of your milkshake.have someone do a cylinder leakage test paying xtra attention to the exhaust valves.

SB

iTrader: (1)

A few more things to throw at you in addition to things mentioned/asked above:

As a note: A leaking intake gasket from coolant port is very common on bbc's. Better gasket fit (ie: gasket you are using doesn't surround the water ports well) or sealing may be needed if this is happening.

Do you still have the factory HP500 PCV hooked up ?

Fountains sit real low in the rear. Do you have internal and/or external flappers that are still in perfect condition ?

getrdunn

iTrader: (7)

Not sure what valve guides you have however sounds like there is a clearance issue or the bronze/magnesium/metals guides are taking a time out do to corrosion (braking down) from all the condensation.

getrdunn

iTrader: (7)

Had those milkshakes back in the mid - late 80's and is hard on engines. That was when I learned you couldn't run a 108 lsa. Reversion wasn't discussed much then. That was trial and error days for me as well as many others.

jersey

Thanks guys for all of the advice I had stainless marine put in the new baffle that jerry uses on all of the newer pipes he makes and I also have external flappers already. I had the pcv hooked up but when I noticed the milkshake the builder put on k and n breathers. The intake gaskets that he used were felpro 1275 I wasn't real happy what I saw on the second engines looked like it could have been compromised. I bought felpro 1275s-3 this time supposed to be better.

jersey

What about the difference in water and oil temps ? Shouldn't bring up the water temps with a thermostat ? Or bring down oil temps to about 185 like merc recommends ?

mike tkach

iTrader: (3)

imo oil temp is good but i see no reason to run a crossover in your application except for looks.if it was mine it would get a circulating pump and a 140 thermostat .

jersey

I have been thinking about going back to circulating pump. But i can't understand why for 170hrs I had no issues and now change cam which people say is fine and I have all of this reversion. I have to talk to someone else at merc tomorrow he was out sick. And I will give an update on what he says.

mike tkach

iTrader: (3)

merc runs a circ pump&thermostat in a hp 500 for a reason,thr merc guy you are going to talk to might explain why if you ask him.