I through a rod and it has left some scoring in a couple of the cylinders. What is the maximum I can have this bored out, .06?

Thx
Greg

 

I think thats the safe limit there, but you might find a machine shop that will do more then that. Anymore then that and the cylinders get to close together and that is added heat you dont want. I think i have heard of a .09 somewhere too. If you are going to just race and then shut it down it prolly will work but not on a daily driver or long trips.

 

A couple of guys I pull with have went 120 thousanths. Kinda sacres me, but it can be done. I do not even like having a block bored 60 over, but that is just me. I guess it is just what you and your machinist are comfortble with. This is just my opinion.

 

just to let you know I have my block .060 over with absolutely no problems at all. If you need more you may be able to put in a dry sleeve. Just a thought.

 

I to had my 460 punched to 0.60 over . Eric

 

.060 over won't be a problem. If you want the security of knowing exactly what the core looks like or intend on going to a
larger oversize, have the block sonic checked, about $75.

 

Thanks for the info. Boy, if I could go .12 I might not have to do a sleeve. One shop told me if they put in a sleve($60) that it distorts the cylinder next to it?

Any one else seen more than .06?

Thanks
Greg

 

Susposively, some of the stock 429/460 blocks have gone as much as 4.600" (.240"), many have been bored to 4.500" (.140"). I have heard the early blocks can take this overbore but a sonic check is required.

I'd bore a stock block .060" and not blink an eye.

 

Hmmm, that doesn't sound right. I've got a 302 that I had to sleeve and adjacent cylinder distortion wasn't an issue. This motor was done by an extremely reputable race shop who would have told me about any sort of issues like this considering the coin I dropped on that engine.

If you consider the fact that the final bore has to be done AFTER the sleeve is put in, the cylinder distortion theory doesn't hold water as far as I can see. Any machinists want to chime in on this???

 

I checked with local mach shops and they said only go to .06 over due to largest piston is .06 over.

Sound right.

Thankx
Greg

 

That's true for cast pistons.

 

My 460 is.080 over but it's just for racing. I haven't even run it yet, so I don't know of any problems.

 

I bored my 460 block .100 over, after a sonic check, and have driven thousands on the street since with no overheating issues (in Tucson). No long trips though, and no towing.