sarafina, I think someone is yanking your chain. There are regular gaskets, metal gaskets, and specialty gaskets etc, but I have never heard of a marine gasket
for an engine. Diesels have high compression
, and most auto gas engines have a much higher compression
than an old Atomic 4, so no marine gasket
was required for the a-4. As a mater of fact, I am not familiar with any special head problems with that engine. Head gaskets if blown can be easily hand made from gasket stock by any good mechanic
. The engine's weakest feature is its 2 bearing main crankshaft with no intermediate bearings, and that has not been known to be a problem.
The A-4 can still be found and are easily rebuilt, and a number of shops specialize in that. The engine was used everywhere because it was cheap
and reliable, and today there are several diesels that are a straight drop ins as a replacement. Universal makes one themselves from a kabota diesel.