Wobble

Yes that might do it, I would also try and do some kind of pressure test on that header while it is off, might be a porous casting, (not that I aware of any problems with revolution) I like them and would buy again

HiPerf2000

iTrader: (2)

Are you running on the hose or in the water ?

If on the hose,
Make sure the front of the trailer is high enough to prevent a forced reversion.

If in the water,
Do you have merc silent choice with the "Y" pipe. There are also flappers in there. I had one that was bad in my boat and it ingeseted some water.

jmherbert

Well,

i just ran a leakdown test (cold, yea, I know) and #1 was leaking thru the exhaust valve and 3 was leaking thru the intake valve. They were both around 5% at 90-100psi. They were audible and also you could feel the air coming thru the respective manifolds. 5 and 7 were less than 5%, but you could hear it going either thru the rings or out the head gasket. Hard to tell.

Funny thing was the other side sounded better, but all 4 jugs were leaking about 10%. I know the % don't mean much when cold. Hopefully tonight I can tear it down to check gaskets and also flatness.

Its always been run in the water (my neighbors aready love me ) and it is thru hull only.

Thanks.

cstraub

I would not recommend using the Fel1003 head gaskets. They are not stainless core and if this is an open cooling system the gaskets will rot away.

jmherbert

Chris,

What would you recommend? I am running 0 deck, and right @ 10:1, (depending on gasket thickness)

Thanks

jmherbert

Some pictures of port head ports and jugs. Looks like water was coming down the cut-in bronze seat on #3 and perhaps #1

Side shot of head still on block


#1 port


#3 port
(deleted because pic below is better)

#3 port, notice the pattern of the rust. Looks like it originates from the bottom of the guide and is blown out from there from the exhaust pulses



Bores look OK, except #3 which is glazed.

Wobble

is there any sign of water on the intake side of the head? how about around the inyake bolts where they go into the water jacket.

jmherbert

No, there is no sign of water on intake side, or on the bolts. I used red silicone on the threads of the headbolts.

Wobble

in your first picture it looks like the water has been pooling in the bottom of the exhaust manifold and making a rust mark at the bottom of the exhaust port. I would definitely pressure test that header and riser, I know it's new but..

It's possible that the valve guides could be leaking also.

jmherbert

I asked Terry at revolution, and he said that they were checked before shipping. He also said that in 4 years none have cracked...

But...

It isn't going to hurt anything to hook them up to a garden hose...