A-460 BORE

MY A-460 BLOCK NEEDS REBUILD, THE BORE IS 4.600. LIGHT SCORING IN CYLS. 3 CYLS. ALSO THE LIFTER BORES
NEED TO BE BUSHED. CAN I GO 6.025 OR SHOULD I LOOK AT REPLACING THE BLOCK?

I would first talk to a noted FORD engine builder to see what's available in piston and ring packages first before doing any work. I think most of those blocks have a 4.625 limit. See how much honing needs to be done to clean it up next. Before bushing the block

Ace

I got one that's 4.652.

The first thing I would do is get it sonic checked to see just how much it can be safely bored. Diamond can custom build any piston i believe,so that should'nt be a issue.

There are rings for a 4.610" bore....that's where I'd go this time and save the 4.625" for latter use.

Lem Evans wrote:There are rings for a 4.610" bore....that's where I'd go this time and save the 4.625" for latter use.

X2 that's the key thing right there, the available ring packages. Go to 4.610" on your bore size.

If you are going to bush your lifter bores, then go ahead and bush them for the Mopar lifter size of .903"/.904" and that lets you run a +.070" larger diameter roller wheel on the lifter. Thus a longer lifter life with all other things being equal.

Charlie

mustang557 wrote:MY A-460 BLOCK NEEDS REBUILD, THE BORE IS 4.600. LIGHT SCORING IN CYLS. 3 CYLS. ALSO THE LIFTER BORES
NEED TO BE BUSHED. CAN I GO 6.025 OR SHOULD I LOOK AT REPLACING THE BLOCK?

" light scoring"- hone the cylinder till it cleans up . remember the rings at .005' over(file fit) , a 4.604' piston might work.

Hi,

Before posting a new topic question on bore size again, someone might be able to advise ? Safe bore sizes and rotating assembly kits ?

Looking to remove motor to investigate ongoing overheating issue so can carry out more of an internal view of the assembly and water jackets etc (no access to freeze plugs, tight fit), another story...

Block is early 460 at .040" with 12.5:1 TRW Forged Pistons. (4.400 in) I want to reduce the comp to run on pump gas.

If the block needs a bore & pending wall thickness test, not looking for a Monster HP Revving numbers but may think to buy a nice reliable new rotating assembly kit.

As a reference looking say a complete rotating (stroker) assemblies from Summit & SCAT only show show (.030" over 4.390) & (.080" over 4.440) what happened to .060" ?

So regardless if I need to bore or not, they only appear to offer kits in .030 or .080 ? is this the magic combination rule set by the stroker god ?

http://www.scatcrankshafts.com/rotating-assembies/ford-rotating-assemblies/

Stock bore of 460 is 4.360 inches
.030" over 4.390 in
.040" over 4.400 in
.060" over 4.420 in
.080" over 4.440 in

http://www.speedwaymotors.com/429-460-Ford-Stroker-Kit,5530.html Found this so apparently they can be had.

Probe, Diamond, have pistons at 4.420"