I was just wondering what we could bore our blocks out to. Also I have heard several people Mention something about big bore motors, are people just boring these things out, or are they sleving the block. Any information is appreciated

 

I personally don't think it's safe to bore our blocks any more than .020" over.

I don't have any info on the possibility of using cylinder sleeves.

later,
chris

 

You can sleeve the block to 3.70" bore (358.3 cubic inches), but the water jackets have to be filled with concrete or Hard Blok to keep the cylinder walls stable. That, of course, makes it race only.

 

Is this what they did for the new cammer 5.0? 94mm = 3.70"

http://www.machinedesign.com/ASP/str...tedArticle.asp

http://www.fordmuscle.com/archives/2...er/index.shtml

 

They sleved the cammer. It is a sleved 4.6. I was wondering if we could do the same thing with ours.

 

The cammer has an aluminum block. Modular aluminum blocks are siamesed, so there is no coolant passages in between the cylinders. Our iron blocks are non siamesed, and there are coolant passages between cylinders. To go 'big bore', you have to bore the cylinder case to 3.840", which is the minimum OD for a 3.70" sleeve, and then there's nothing left of the original cylinder to support the new sleeves. Thats where the concrete or Hard Block comes in, to support the cylinder walls. When your water jackets are filled with concrete, you'll overheat running on the street.

SHM casts an aluminum 5.4 block now that can take a 3.75 bore because its siamesed. It costs around $4500, which is very reasonable for an aftermarket aluminum block.

 

rscoleman,

Good info... thanks

 

Thanks for the info man