If any one could throw some clarification on the following i would appreciate it.

Class D thru to H2 engines are defined as mainstream.
The rule in 4.2 states "based on current, or prev advertised/available mainstream production units with a min production run of 500 units, from the pleasure line and not race"

In my version of reality, and accepting the fact that mercruiser inboard v8, originally and to a large extent are now just open cooled (marnised- marinated is the wrong term) chevy engines, anyone who has produced a chevy engine, and not defined it as a race spec motor, and who has sold more than 500 of said units would be legal? Where does the O.EM start from?
Edelbrock do a nice 555ci http://www.edelbrock.com/automotive_new ... _676.shtml
Not defined as race, it is mainstream, and following a phone call with them, they have sold over 500 units as advertised.
Likewise many other engine builders offer or have offered many variations on the chevy blocks, including stroker motors , mercruiser just bought in the factory bare and un machined blocks and decided to cool them in a different way.
Does the O.EM relate to chevy or the bastard brand mercruiser?

The next question is similar.
H1 and H2 classic, note the word “CLASSIC” have the same restrictions? – even in total original format they would not be considered legal? –has the ginger one, you know who i mean, completely lost the plot?

I wouldn't worry to much about the rules
Stability was the key & thats gone out of the window, In fact I think it has changed 2 or 3 times since the printed PB2010 Version was released.
once the UIM got hold of it all changed despite the efforts & resistance of the original founding group.

Think we are on the 2nd or 3rd choice of block now from the changes that are or were going on. Once it settles Guess we will order up a couple of blocks but not before common sense returns. (And a decent exchange rate)

WHat are there now 3 or 4 Marathon boats up for sale..... says it all really

Before you order from across the pond, tell me what you are after --a bare block is a bare block, its the machining that counts. I have a few Brit and European contacts that will generally beat USA pricing.