Chevy L6 (250) 0pened to 4.00 Bore

[old28]

OK guys, now that I know the block can be bored to 4.00" with it pour filled has anyone done a 4.00" bore on a Chevy L6 250 block with the water passages in the block still open.

I really would like to keep the cooling system for the whole motor if I can and pour filling an L6 motor is not as easy as a SBC V8. The cost of sleeving the motor is out of my bracket.

This motor will replace my existing 194" L6 with a 266" L6 in my vintage dragster.

[ricardo1967]

It is gambling, but many people has opened the L6 (250") to 4.000" and still kept the water galleries. It's also a factor where the block was cast (US, Mexico or Brazil) and how old (corroded) it is.

Lots of L6 info here: http://www.inliners.org/

[old28]

I know where your coming from on this big of bore. Know anyone that has done this with the water jackets that I can contact?

It looks like a lot bigger job to pour fill a 250 L6 than it is to do a SBC V8. What say?