[Tom Vaught]

You might want to read this paper on Brinell hardness for OEM Blocks.

http://www.afsinc.org/files/images/iron%20alloys.pdf

From what I read 180 barely meets the bottom spec for a cast iron OEM block as far as material strength.

But you still would have a block with 4 bolt mains, (steel caps and splayed outer bolts), thicker cylinder walls, more material in the valley, stronger lifter bore design, etc.

Some years ago a Pontiac family bought some blocks that were not quite up to spec and eventually both blocks had issues, Failed.

That being said, Marty Palbykin (with a 1967 factory block) with splayed caps installed and some block chryo treatment ran a 1600 hp Twin Turbo engine for 3 years before a crack developed. Is the engine NA and what rpm are you assuming?

Tom V.

[p4msi1]

Tom, D1SC procharger street driven, not raced. I am stepping up from stock iron heads to ported edelbrock and do not want to ruin the current 455 assembly. I will turn about 5500 rpms. I was assured this block could hold 800HP but I also don't want it to be an expensive lesson.