yes, more then likely it is

I heard of people running a bypass hose from the front to back of manifold,will this help?Or should I drill and tap for the stock bypass from pump to manifold?

Nordic95

You mean to the intake right? Ive never tried to run without one. Your intake doesnt have a bypass port in it?

Yes,to the manifold.Now I'm running Hardin Marine manifold and no provision for the by pass hose.I was told I didn't need it.My Gen 5 doesn't have it either and it runs fine.

Nordic95

can you email me pics of your setup????? just doesnt sound right, this is basicly how it should be set up

Goodt,
Here is a pic of the engines.

I think the problem is the bypass but if you give me a call tomorrow Ill give you some other ideas to try, are you running a dry joint between the manifold and riser???? ( solid gasket, no holes )

Yes,and the manifolds are also brand new Revolution Marines.I also just noticed in my picture that the manifold has a tap for the bypass hose,but that manifold is on the gen 5,the gen 4 is on the right.No provision for the bypass on the manifold for the gen 4.I wonder if the manifolds are mixed up?

Those engines look sweat. Could one of your temp gages be off ?

Thanks,I checked guage and sender.I think its a steam pocket or a hot pocket,just can't eat it!!!