What is a Siamese block?

[lemming303]

What does that mean? On an ad it says "Siamese block or resto"

[Moparal]

Siamese cylinders are all joined together side by side. No water inbetween the jackets.

[moparniac]

Siamese cylinders are all joined together side by side. No water inbetween the jackets.

Yeas ALAN is right............. 

[Chryco Psycho]

to clarify the bores are linked between each bore adding stiffness to the bores , the water has to ciculate around the ends of the group of 4 bores to cool

[lemming303]

OK that makes sense. So if you use this type of block do you need a stronger water pump? Does it effect the cooling efficiency of the engine at all?

[Ck[FIN]]

Stock water pump will work. Pistons could need more clearance when the block is honed to specs?

[lemming303]

Cool, thanks yall.

[moper]

The 440 Source block 

JK.. what they said.