426 hemi Water vs siamese block

[66Charger440magnum]

Hi, what is the differences between a 426 hemi Water block vs siamese.
Thanks

 

[aldal]

Simply put, the Siamese bore blocks have the cylinder walls "Siamesed" or "adjoined" together in between the cylinders. There is no air gap for water to pass through between the cylinder bores. This added material built up between the bores allow the cylinder walls to be enlarged to much larger bore diameters before the wall thickness becomes too thin to safely operate. For instance a non Siamese block at 4.125" bore may only have .120" of iron left on the non-thrust sides of the cylinder walls. This would be getting close to the maximum bore you can safely run on a block that will be making significant power. Now in a Siamese bore block, at 4.125" bore we may have .300+" of iron before we hit the opposite cylinder, which obviously leaves room to run a much larger bore.

It isn't written specifically about the Hemi but I found this online somewhere...hope it helps.

 

[66Charger440magnum]

siamese block

Simply put, the Siamese bore blocks have the cylinder walls "Siamesed" or "adjoined" together in between the cylinders. There is no air gap for water to pass through between the cylinder bores. This added material built up between the bores allow the cylinder walls to be enlarged to much larger bore diameters before the wall thickness becomes too thin to safely operate. For instance a non Siamese block at 4.125" bore may only have .120" of iron left on the non-thrust sides of the cylinder walls. This would be getting close to the maximum bore you can safely run on a block that will be making significant power. Now in a Siamese bore block, at 4.125" bore we may have .300+" of iron before we hit the opposite cylinder, which obviously leaves room to run a much larger bore.

It isn't written specifically about the Hemi but I found this online somewhere...hope it helps.

HI, thanks for the infos, it helps, but it is safe to run a siamese block in the street since it have no water passage between the cylinders.

 

[HEMI-ITIS]

I use that block on my street cat which gets to the track 4 or 5 times a year. I went to the Rumblers car show in Coney Island , Broolyn last week. Sitting in bumper to bumper it went as high as 200* befor the road started moving and it dropped like a rock back to 180*

 

[Heminit]

Water blocks same as original gen2 blocks which they don't make them anymore, Siamese blocks water circulation not that good far as I know

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I bought non Siamese, most people will tell you, it all be fine but, I won't take that risk