[62CHEVYC10]

I am looking for a listing on this TRW part number but haven't had any luck on the web. Does anyone else have a listing for this:
TRW L2211A. There for a 327 chevy, they have a .200 dome and there forged.

Thanks Dennis

[woodz428]

They are listed as 12.5-1 pistons, probably with early size chambers.

[66GMC]

Hi

TRW = Sealed Power = Speed Pro = Federal Mogul

My theory is that that particular part number may have actually been something like "L2211AF30", but searches of F/M's site came up empty ... perhaps it may have been discontinued???

I had L2348F's in my 351C. Their search engine doesn't find that, but it does find "L2348F30"

F/M On-Line Catalog

[woodz428]

I got the listing from and old TRW book, They are 12.5-1s. That's one reason I have catalogs back to the 60s, I buy all sorts of older parts and it helps me know whether it is as presented. The 30 on the end of the part # 66GMC gave is just an indicator of the oversize, the part # is L2211A...30 is a.030 over,40 is a.040over,60 a.060 over and on for however many oversizes they offer. Just punch up the # with different end number and you will see what I mean. Most Piston companies won't list standard sizes for older engines. On the Piston, no matter the oversize it will be the same number with an oversize # stamped in. If you want a standard size order the number that is listed without a suffix #. If they are still in inventory you will get them.

[66GMC]

Originally Posted by woodz428

I got the listing from and old TRW book, They are 12.5-1s. That's one reason I have catalogs back to the 60s, I buy all sorts of older parts and it helps me know whether it is as presented. The 30 on the end of the part # 66GMC gave is just an indicator of the oversize, the part # is L2211A...30 is a.030 over,40 is a.040over,60 a.060 over and on for however many oversizes they offer. Just punch up the # with different end number and you will see what I mean. Most Piston companies won't list standard sizes for older engines. On the Piston, no matter the oversize it will be the same number with an oversize # stamped in. If you want a standard size order the number that is listed without a suffix #. If they are still in inventory you will get them.

Yes, I was aware of the fact that the suffix indicates the oversize ... and I should have been clearer on that.

The point that I was attempting to make is that you might have to include a suffix in your P/N search at that site. If you do a search on "L2348" or even "L2348F" it comes up empty ... but it does return results for "L2348F30"

The fact that you still have an old catalog which does show that piston, re-inforces my theory that the "L2211A" series has been discontinued.
Curious, though ... was there an "F" in the part number (i.e L2211AF__)?
I was under the impression that an "F" indicated a forged piston, no?

While we're on the subject of forged pistons...

As you said, some pistons are not available (and may never have been) in STD, as I believe was the case with the L2348F's. My pistons WERE .030 but were still stamped with just the "L2348" part number. My machinist said that that .030 was the smallest size available in that series ... and that was in about 1980.

Perhaps the reason for not lising a STD piston is that TRW (and others) didn't want people ordering STD pistons, and installing them in bores with "marginal" taper? I believe that .005 taper would be the "acceptable limit" when making the decision to bore to oversize or not? Forged pistons must be fit correctly to the bore, as they have a tendency to "grow" as they warm up.

ALWAYS allow an engine with forged pistons to get up to operating temperature before revving it. That's why my 454 is going to have a "cold" light ... as a reminder to keep your foot out of it until it hits a minimum of 170°F.

[woodz428]

I was running a machine shop in the 80s and we could get standard pistons still. It may have been the supplier that your shop used. I build 351Cs so I had the opportunity to get some stock size pistons at that time. I still have several low mileage blocks that don't need an oversize, so I will probably contact some obsolete suppliers when I need some. The F, if I recall right, was to designate the Powerforged pistons, that became fairly standard as opposed to the older style Forged pistons. They were designed to run a little tighter clearances than a regular Forged piston. It's similar to the move that is going one now with Hypereutetic pistons being phased in as replacements for most pistons. Forged pistons, because they do expand( the Powerforged not as much), need more clearances for the reason you mentioned. That's why they can work in a cylinder that might be marginal for the old style cast( and newer Hypereutetic) pistons.

[machine shop tom]

The current part # for that piston is L2211AF, available in .030" and .060" oversize, no standard size listed. Has a .0325" dome, approx. 11.86:1 with 64cc heads.

tom

[DBourg]

Hi., I was recommended KB142 pistons for my build.8.98cc. I was
looking at theTRW-L2441F30 pistons, How will that work compression
wise compared to KB142 and how will they hold up, used as a daily
driver and do I have to have as much gap clearance between piston
to bore and ring clearsnce?

[jim815]

Hey Tom, I also have the L2211A .060 pistons in my 327(now 336) and I need to know the pin size. I think the diameter is .927 but not sure of the length. I believe I will need two of the pins but the engine is not apart yet.
Any help would be appreciated, Jim

Originally Posted by machine shop tom

The current part # for that piston is L2211AF, available in .030" and .060" oversize, no standard size listed. Has a .0325" dome, approx. 11.86:1 with 64cc heads.

tom