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Author Topic: Chevy L6 (250) 0pened to 4.00 Bore  (Read 4928 times)

Offline old28

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Chevy L6 (250) 0pened to 4.00 Bore
« on: February 01, 2014, 08:08:04 PM »

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.
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Offline ricardo1967

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Re: Chevy L6 (250) 0pened to 4.00 Bore
« Reply #1 on: February 01, 2014, 11:56:10 PM »
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/
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Offline old28

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Re: Chevy L6 (250) 0pened to 4.00 Bore
« Reply #2 on: February 02, 2014, 07:33:15 PM »

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?
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Re: Chevy L6 (250) 0pened to 4.00 Bore
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