Thread: 454 marine engine questions

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I have to bore the 454 30 over right, or 60 over to make the 496 stroker? And, since this is a marine engine, I heard it is a tall deck whatever that means. I am new to BBC's.

Originally Posted by AdamB

I have to bore the 454 30 over right, or 60 over to make the 496 stroker? And, since this is a marine engine, I heard it is a tall deck whatever that means. I am new to BBC's.

To build the 489/496 you also have to add the 4.25 stroke crank.
The 489/496 is built using the low deck 454 block.
The low deck height is 9.80,the tall deck height is 10.20.

So, since the marine engines are tall deck, what does that mean for the stroker combo? Can I get more stroke out of it?

Originally Posted by erik erikson

To build the 489/496 you also have to add the 4.25 stroke crank.
The 489/496 is built using the low deck 454 block.
The low deck height is 9.80,the tall deck height is 10.20.