.... I dunno what the 'N" means...

The "N" in these pistons means that the crown is Not flat. Hence, L2443NF-030

.... (Started out running only 93 octane, but 91 seems ok, no detonation as yet).

Are you sure??? Be sure to do spark plug readings and jet on the rich side; these pistons promote inaudible detonation in the 460 due to their peaked dome-top design. Further, the intake valve relief is cause for the ring land to get really thin near the top ring,  thereby creating a hot spot....and so this is where the L2443's melt first:

I really think though with 95cc heads your much closer to 10:1 or less...

Think again....

LO

same pistons i have in my liberty except i have the dome milled off.
0-decked block and d3 heads  10.5 to1

Ralph either we had a mis-communication or I had a brain fart; your shortblock is 9.65:1 with D3Ve's or 11.6:1 with early-style heads.

How much do you think would need to be milled off the dome to land 10:5 CR?

im getting 11.307 with the 12.01 cc dome and 0 deck

The way I see it I'll have to check the deck heigth when I get the block back.
That is the one variable I don't have the answer to for sure at this time.

 It's out for cambearings, hone and super clean...  we'll see.   

The seller was running scj aluminum heads with a wicked roller cam.  I'm just running
the edelbrock rpm heads.

Do you think they will be ok?

The pistons came in and we're getting the final parts needed for the build.   The pistons came
with NO info on ring gap etc?   What final bore clearance should we shoot for and what ring gap?

What ever happened to "this is what we made and this is best how to set it up"?

I usually go .005 over on the ring w/ forged pistons because of the extra clearence required. Ex. .030 pistons- .035 rings. I do this because every one thou you enlarge the bore, you open the ring gap Pi (3.147) so for .003 extra clearence you've opened the ring gap .010 or so. As  rule go .003- .004 per inch of bore. IMO

Well after close examination, unless you want to remove material from the skirt of the TRWs, I don't think mixing them is a good idea.

Weight of TRWs is 927 grams to the Federal Mogul's 911

The un-coated piston on the left is an original TRW-style piston.  It has square cut pin clips and is made from a different slug forging and a better material than the one on the right.

The coated piston on the right is a Speed Pro version L2443, has round-wire pin clip grooves, a smaller dome, reduced skirt tang reach, etc.

Aside from the deeper skirt tangs, I have a personal preference for the pistons style on the left; the new Speed Pros are currently made in India and quality control is in the toilet.  Incidentally, there is a version of the L2443 piston like the one on the left and which also has the shortened skirt tangs.

Well after close examination, unless you want to remove material from the skirt of the TRWs, I don't think mixing them is a good idea.

Weight of TRWs is 927 grams to the Federal Mogul's 911

Depending on application, the two pistons shown in your picture can be made to be used together in a set of eight. It is not ideal but it is possible...depends on the rest of your build. Also, it may be possible to find the correct pistons that you need in order to complete a full set of 8 that are all the same piston revision.

NOTE: cutting down the deeper skirt is not a wise idea because pistons are cam-ground and the skirt dims are spec'd in a specific area of the pistons...correct cylinder-to-bore clearance is impacted and excessive piston rock may result.  Again, might be possible but you really need to know what you're doing.

LO

New to the forums, rather than post a whole new thread, this one was the first to come up.

I ended up with a set of these pistons, but there is combination of the old TRW (7) and 1 of the Federal Mogul.  Does anyone know if you can combine sets of these?

The TRW are labeled L2443 .030 and the Federal Mogul are L2443NF .030.

I would have given you my old trw pistons for the shipping but mine have the N which is anoher revision from yours.   I have 6 of the  L2443NF .030  if you want them I'll sell for $100.00 delivered.  They are boxed up in the garage not laying around.

No, not new.  They have about 4 hours run time.   

I have a brand new never used set of 8 true TRW L2443 dome tops (like those on the left-hand side in the above picture), complete with piston pins, Tru-Arc snaprings, all TRW paper work.  $440 shipped anywhere in the U.S.  Summit Racing wants the same amount for the crappy L2443's shipped. The original cardboard pistons box is yellowed but hey it's an original set what do you expect?   

I'll post pics if someone starts the other thread.

LO