BoatBanter.com - View Single Post - INDMAR Engine (Corvette LT1) Overheating

Tom Francis - SWSports

On Sun, 18 Jan 2009 14:28:03 -0800 (PST),
wrote:

WHAT I THINK THE PROBLEM MAY BE
I think i may have done a head gasket. But i am open to other
suggestions from anyone who may have a bit more knowledge on the
engines. I figure water is pouring into the exhaust (or exhaust into
the water) when the engine is under load, creating a hot air pocket
under the engine side thermostat which is preventing it from opening
and causing the problem. Potentially it is only when under load that
this seal is "blowing out", which is why i can run all day so long as
i take her to speed slowly. There are no other leaks, could the
cooling circuit be sucking air from anywhere else?

The easiest way to determine that is the old hand test - back of the
hand on the right and left side of the exhaust manifold. If one side
is cooler than the other, there's your problem.

I think you are on the right track - head gasket. It doesn't sound
typical, but based on the symptoms, that's what I'd guess - in
particular with all the other repairs.

--

"I am free of all prejudices. I hate every one equally."

W.C. Fields