I have been running a 13.5:1 piston in my 440 motor fir the past 30 hours and I need to step down to an 11:1 piston so i wont have to run race gas, now my question is: can I just lightly hone the cylinder and install the 11:1 piston with the same bore size or will I have to get it bored to the next size up? any help would be greatly appreciated. thanks

 

There should be no ridge with 30 hours on the clock. Do the light hone, slap the new piston and rings in and go have fun.
The only caution is: If you are running a forged piston in there now and then if the 11 to 1 is a cast you will more than likely be too sloppy. But if you run same to same you will be fine.

 

As long as your cylinder doesn't have any flaws from the last 30 hours of running, a mild honing with the same size piston you have now should d the trick.
Be sure you run the same brand piston though, I have ran across many situations between piston brands that are SUPPOSED to be the same size......but vary enough in piston-wall clearance that a bore job and another size up piston was required.

 

the piston in it right now is a ross piston and the one im gonna put in it is a wiseco, does anyone know if they are forged or cast?

 

KNOWSALOT added a "very" important paragraph about using the same brand piston. This is very good advice.

I can't answer your question about the wiseco piston. I could only guess, and that's not good enough when it comes to things like this. Do yourself a favor and when you get the parts all together, take it to a "trusted" machine shop and let them mic the barrel and have them tell you if you have the correct clearence. This is too important to guess at. You will sleep better at night when you know your rebuild is right on the money.

 

The wiseco is forged, I do not know about the ross.