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By silent rick - 4 Years Ago
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looking for info on a TRW L2018F piston. supposed to be a stock profile flat top piston for a 312 Ybock standard bore 3.80" or in other words, a .050 over 292 piston.
is this a forged piston?
i know TRW is no longer around and is now speed pro. i don't see it in any speed pro catalog..
i'm looking for a forged flat top stock profile 312 Y-block piston in std bore.
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By 55blacktie - 4 Years Ago
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Unless someone just happens to have one lying around, you'll either have to order custom pistons, or check with John Mummert. Run-of-the-mill replacement pistons are cast and probably reduce compression ratio by being more than .020 below deck height.
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By silent rick - 4 Years Ago
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i'm after 8.0:1 to 8.5:1 compression. add me to the list of guys with a Y Bloke 4-71 manifold.
also looking for C2AE rods. i'll be listing a bunch of intakes for sale here soon.
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By Cliff - 4 Years Ago
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Yes that's a forged piston, there is a difference between a .050 over 292 piston and a 312 (skirt length) the 312 piston will work in a 292, the 292 piston will not work in a 312 (hits the counter weight), a standard bore 283 piston will work (.075 over 312) you will have to bore the rod (pin) to .927 most forged 283 pistons will be full floating.
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By silent rick - 4 Years Ago
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yep, i have a .050 over 292 block
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By 55blacktie - 4 Years Ago
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Finding the right 283 piston will be almost as hard as finding the right Y-block piston. There's little demand for them.
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By NoShortcuts - 4 Years Ago
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Silent Rick. At an earlier time, like the middle '60s, Thompson Products made PowerForged pistons that were marketed as aftermarket replacement pistons. I used them in the first y-block I rebuilt in 1966.  Thompson Products merged OR became TRW at some point in time. You might be able to determine the history on this company change using the Internet.
TRW continued to market replacement PowerForged pistons. You know more about what became of TRW than I do!
Per an old TRW sheet I have, L-2018 pistons are PowerForged and 3.800 inch diameter. I don't know what the 'F' suffix you identified means regarding their oversize dimension for the 3.800 basic bore diameter.
Cliff is correct about 292 y-block pistons having a different skirt configuration than 312 y-block pistons. As Cliff indicated, 312 pistons can be used with a 292 crank, but 292 pistons can not be used with a 312 crank due to an interference issue.
Forum Moderator John 'Hoosier Hurricane' in a posting some years ago explained what modifications he had done to utilize a set of GMC C***Y pistons in a y-block he built. My recollection is that John indicated that the C***Y pistons he used had press fit piston pins where the y-block used full floating piston pins. As Cliff indicated, the pistons John used may have been cast rather than forged. Also, didn't the C***Y pistons have valve notches in their flat tops? John may be able to recount all that he related previously. It almost seems like there was a piston pin compression height issue that required John to machine the piston tops, too.
I suspect that the Forum link with Hoosier Hurricane's posting is so old that the software package changes webmaster Jim Culver has installed for the Forum website would make it unreachable in the archive. John or Ted may be able to answer that accessibility issue.
Silent Rick, I've got a friend with a stash of old y-block parts and NORS parts. Last I knew, he had some flat top replacement Thompson Products or TRW forged pistons. What PowerForged replacement diameter pistons are you seeking?
IF you're going to use a supercharger and are looking to use a static compression ratio of 8.0 or 8.5:1, it seems like you are looking for a set of y-block 5750 / 471 cylinder heads. Rono is someone you should try to connect with on this Forum. I recall that he's using a set of 471 heads on his supercharged engine. I think he's using the same intake manifold you're talking about using as well.
Hope some of this helps! 
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By Cliff - 4 Years Ago
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F means forged, the pin height is good as is, almost all performance pistons are machined for floating pins, 305 sbc and 307 sbc will fit also, the valve notches will not line up.
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By 55blacktie - 4 Years Ago
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Valve notches will not line up." Did you mean that the 305/307 pistons will not fit? I ran this by Ted a few months ago. Realizing that I had miscalculated, no, I'm not going to use 283/307/305 pistons.
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By darrell - 4 Years Ago
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some 292 pistons can be used on a 312 crank.i used a set of federal mogul pistons years ago.
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By Cliff - 4 Years Ago
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You don't need the valve notches
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By 2721955meteor - 4 Years Ago
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I purchased a y block core from a junk dealer complete engine. on looking why it would not turn 2 revs, removed heads and pan. found this was a 312 , I noticed the pistons came to the top of the block,as well had a rebuilt tag(autherised ford rebuilder). cheked the con rods they where 292 rods(slightly longer than 312.) re info on this great sight. Freed up stuck valves and got engine running, ran well. sold same. I am interested if the 292 con rods would eventionlly cause issues. the engine had new style thicker gaskets(aprox .040 thicker) than shim typ. coments pls heads where 1956 markings ecz c that suggests 1956 mercy,
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By Ted - 4 Years Ago
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2721955meteor (3/19/2021)
...I am interested if the 292 con rods would eventually cause issues.
I prefer the longer rods when I can use them. There is less piston to cylinder wall wear at the lower ends of the cylinders with the longer rods and in those cases where the compression ratio is marginally on the high side, there’s less propensity for detonation due to an increased residence time at TDC. Where the stock type pistons have adequate deck surface material and/or a ring land that is not crowding the top of the piston, it’s a simply matter of machining the tops of the pistons to get them back even with the decks. If zero decking the engines, then it typically does not take very much piston machining to accomplish this when using the longer rod with a 312 crankshaft.
I have run as long as a 6.750” long rod in the Y engines along with a 4.000” stroke and that requires a piston compression height of 1.000”. That combination makes for a very tight ring package on the piston but is a very strong performer. I have done several 312 crank, 292 rod combinations with a relocated wrist pin location in 292 blocks and those always end up being very good engines. As a caveat to this, the longer EBU and C2AE rods are always easier to find than the shorter ECZ and C1TE rods.
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By Hoosier Hurricane - 4 Years Ago
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As No Shortcuts stated, I have an engine with 283 pistons with a 3.750 bore, standard 283 size. The rod (C2AE/292) small ends had to be honed to .927 for the 283 pins, grooves cut in the piston pin holes for lock rings, the pins shortened to accommodate the lock rings, and the piston tops machined to Y pin-to-top dimension. The Y rod small ends were too wide to fit in the pistons, and were narrowed to fit. I didn't have my Bridgeport mill then, or I would have machined the inside of the piston for clearance. Actually, I went with 0 deck height, so the piston tops were measured during pre-assembly and machined for 0 deck. The valve pockets were not considered a problem, the machining eliminated much of the pockets. A plus to this was the top piston ring moved up in the bore. I was able to do all the machining, except honing the pin bores, myself, otherwise this would have been too expensive had I hired the work done. Custom pistons would have been a better choice. I did this because I used an ex stock class block that was already .060 oversize and worn. The engine is in my F350 car hauler and is still doing fine after several years and thousands of miles.
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By 55blacktie - 4 Years Ago
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The stock bore of a 283 is 3.875. The stock bore of a 265 is 3.75. A stock bore 292 Y-block would have to be bored .125 for standard-bore 283 pistons. There's also the issue of compression height and rod length.
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By Cliff - 4 Years Ago
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With 312 rods and a 312 crank (ECZ) you don't have to cut the piston tops, the deck height is about right as is, if you buy aftermarket forged pistons the rods do not need to be narrowed and will be full floating (no need to cut for pin retainers) and yes they still make standard sizes.
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By FORD DEARBORN - 4 Years Ago
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Excellent thread. I only wish I would have known all this 7 years ago when I dropped a 312 crank in my 292. I could have saved .023" of good iron from both decks. After removing that amount from each deck, the pistons were still .009" in the hole.
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By Cliff - 4 Years Ago
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I run 312 blocks with 312 cranks, no problems, I never turn down 312 cranks to fit a 292 block, I worry about overlap (main to rod journal), it's bad enough when I turn down a rod throw to fit a aftermarket rod.
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By silent rick - 4 Years Ago
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i have a 56-57 292 block that has been bored .050 or 3.80.
REX HP told me the TRW L2018F has the same profile as a factory 312 piston. so using a EBU or C2AE rod, the piston will sit a bit below deck and with G heads, i'll end up with a static compression ratio of 8.4:1
they said advertised compression is 9.0 but in actuality, it's more like 8.4
the old TRW piece has the stock 312 profile so that it can be used with either crank. i have a forged C1TE truck crank and am looking for a set of C2AE rods also.
a standard 283 piston is 3.875 which would require i go an addition .075 or a total of .125 over the stock 292 3.75 bore. too much.
i need a set of forged L2180F in standard bore size of 3.80
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By silent rick - 4 Years Ago
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NoShortcuts (3/19/2021)
Silent Rick. Per an old TRW sheet I have, L-2018 pistons are PowerForged and 3.800 inch diameter. I don't know what the 'F' suffix you identified means regarding their oversize dimension for the 3.800 basic bore diameter.
Silent Rick, I've got a friend with a stash of old y-block parts and NORS parts. Last I knew, he had some flat top replacement Thompson Products or TRW forged pistons. What PowerForged replacement diameter pistons are you seeking?
i appreciate it. i believe TRW would use part numbers of L2018F.std for 3.80" L2018F.30 for 3.83" or .030 over 312 and L2018f.60 for 3.86" or .060 over 312. i need a set of L2018f.std or 3.80" thanks everyone
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By Cliff - 4 Years Ago
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They show up on E Bay once in a while, also look for 1831PX (Sealed power) the X means forged,
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By DryLakesRacer - 4 Years Ago
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I don't know how bad you need it or what your willing to pay but I would contact Ross Pistons in I believe El Segundo Ca. Go to their website an see they make custom pistons for flatheads and FE's plus all other Fords even though they don't show a Y-Block. They've made me custom forged pistons for my race and street GMC's. If you send them one I'm sure they could copy with the same weight from one of their other forging. That what I did for my sons engine gave them one to copy and they made 6. You need to make the ring package is the same if you already have the set..
I just bought a single Silvolite CAST off E-Bay for a std 312 and honed out a 292+.040 and extra .010" and was lucky it was 3 grams light and works great. Even bought std rings too.
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By Cliff - 4 Years Ago
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A GM 4.8 (LS) piston will fit with a 6.7" rod and a little work, this gets you a modern ring pack and cheap pistons.
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