1. are you sure the head and the block match? holes all line up etc?
possible that you have parts of two different engines that are not
Extremely unlikely. Everything looks like it matches anyway.
2. are you sure you have the right head gasket? Is it possible to put
backwards or upside down? Sometimes holes don't line up if that
did not happen to me but I know it can be done on a 3.0 Toyota engine
causes disastrous overheating if the engine runs for very long.
The gasket appears perfectly symmetrical. I put the stamped number up.
No holes are covered up.
3. are all of the head studs straight? If not, uneven torque might
Seem to be.
4. You mention the dowel pins. If you have any doubts about them,
them out for new ones.
I think they're OK, but I'll look at them again. They wouldn't be
easy to get out, I think!
If you are certain of all of the basic things, then I would think you
have a good machine shop surface the block and the head to make sure
all is well.
I assume that you are trying to build a very reliable powerplant to
you to operate during times of grid failure. You need to be fairly
will be up to the task.
I don't really need that much out of it, but I don't want it sitting
there rusting during the down-times.