Profiler 210 sbc heads flow numbers. 880" exhaust valve. They are a very nice head. I have to say I was more than a bit skeptical when i saw the advertised numbers. Actually your low lift numbers flowing better will be of more advantage on a street car. These heads are dead nuts for there flow! They were designed by Darin Morgan, enough said. Apr 24, 2010 · 400 SBC heads and cam recommendation by Winston Wolf » Sat Apr 24, 2010 5:06 pm I am thinking of swaping the heads on my . With the increased CSA at the push Rod pinch the pro filer should make more power 300-400 rpms higher in the curve. I spoke to an AFR representative, awhile back Profiler 235cc CNC ported SBC Head Review With Real Flow Numbers Profiler 195cc head vs AFR 195cc head sbc (with actual flow test) May 31, 2015 · Have been looking at AFR heads for a 408 SBC I am building for street / strip use. Jun 11, 2010 · hi, I said in another post about the Profiler heads, that I would post the results of an engine i just did with a set of the Profiler 210's on it. Just curious. I do a review of the AFR Enforcer SBC head. How many sets of heads do Brodix need that wont flow over 300. As the story goes, some claim they are cast up in Australia, others claim China. Also big 2. 400 245 180 . but it has double hump 202 heads. The charts below show the difference between stock flow numbers as well as the flow after our modifications are made. All flow numbers for AJPE — Alan Johnson Performance Engineering heads come from their Web Site updated Aug. Tech Inspector ran my numbers and came up with 538HP/511TQ, getting a little better results with an 850cfm carb. Nov 18, 2018 · I just finished porting one head. Find Parts and Accessories profiler sbc heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Most flow numbers for AFR — Air Flow Research heads come from their Web Site or '05/'12/'13 Catalog, updated Aug '16. May 23, 2010 · The Profiler 210's out of the box flow as well as most of the other guys cnc'd heads in the same catagory. 300" Intake Valve and 1. The actual gain in flow is much more important than what the flow "number" is. 5-278 Air Flow Detail #176 SBC All American Head - 185cc Runner Pro Filer Small Block Chevy All American Heads with 185cc Intake Runner, 2. **REQUIRES RAISED RUNNER MANIFOLD Jesel PRO Series- $1865 KPS-SP1792 LGM Rocker Kit $1365 This is simply one BAD ASS 23º cylinder head! One of the largest offerings currently available. 300 209 145 . 1-70 67 . 070" Moderator: Team 6 posts • Page 1 of 1 trmnatr Oct 23, 2009 · Pro Filer "As Cast" 210 Flow Numbers Jump to Latest 16K views 76 replies 15 participants last post by trmnatr Nov 5, 2009 T Nov 18, 2018 · I just finished porting one head. 030 x 3. Producer and Seller of aluminum aftermarket cylinder heads, intake manifolds and engine accessories. 018 provided the best numbersall on 93 octane. 600 274 213 flow numbers on a Profiler 210 AS CAST (no cnc porting) with a valve job and gasket match tested a 28" with a 4. Thanks. They're designed for all-around racing and are offered with 185cc, 195cc, 210cc, 235cc intake ports; 64cc, 68cc, 70cc, or 72cc chambers; and straight or angled spark plug locations. These are Profiler, 23 degree heads. Being very heavily involved in head-porting the "country of origin" doesn't amount to a Mar 4, 2016 · Thanks for the clarification, I don't know the profiler heads but there are a few different brands of 23 degree heads that all port stall around 0. 6 valves. 500 lift and the AFR's are CNC heads where the Profiler head is as cast. My intake and carb give up some. 08/1. Dec 2, 2021 · I'm curious if anyone has any experience with the AFR Eliminator Race single plane 4150 intake manifold for small block Chevy with partial port match? AFR discontinued their Titon composite manifolds and replaced them with the Eliminator series. Cylinder heads are one of the most important components in your engine build. There are 4 different compression charts listed. 200 135 cfm . For a more strip oriented, same thing applies, but you can go with more lift and duration, as you don't have to worry about the low end as much as a street car. Feb 26, 2007 · So were are the flow numbers for the the 195 Pro-Filer heads? On your website. 600 lift, but what about at . I flow them on camera. I have the Pro Filer's with 2. Feb 22, 2009 · Re: Profiler SBC Heads? #2 by John_Heard » Mon Feb 23, 2009 1:14 pm There is a new SBC head coming out pretty soon from Pro-Filer, call them up and talk to them about it. Aug 23, 2010 · Maybe another one to consider is Profiler Heads, around $1000 for bare heads that have better low lift flow numbers cast on the intake than the 195cc AFRs. 875 - 396" 10-1 comp 268-277 @. I think not only for the money but probably one of the best 23% available. 500 lift. . But I did call Speier and my top end will be about 3 grand. 75" baseplate 2" HVH Super Sucker spacer Keep in mind, this is a pump gas street/strip motor. I am running 2. Please use the chart below as a preliminary head recommendation guide for our products. '16. I bought the 195cc with dual springs from Summit because they where the only ones in stock and I saved $75 in shipping verse ordering directly from Pro-Filer. Aug 15, 2009 · I've done an independent flow test on both cylinder heads. 02" intake/1. Feb 12, 2014 · This guy Tech Speier Racing Heads There is a lot of info out there if you look enough. 65int/1. I have the new Gen3 PC 210 CBC heads with a port match and pocket clean up. Aug 4, 2024 · Wow those numbers take me back to the 90s. 030" 400 with zero deck, Fel-Pro 1003 head gasket, -12cc pistons, 70cc Pro-Filer 210 heads, Weiand 8150 intake manifold, 850 carb, 14" x 4" air filter assembly, 1 3/4" long-tube headers and a custom-ground roller hydraulic cam makes 534 hp @6000 and 521 ft/lbs @5000 on my Dyno-Sim. All on pump gas. 055'' valve flow 302cfm on a 4. 400 254 180 . Cylinder Head, All American, Bare, 2. comEmail: weingartnerracing@gmail. Whats the standard shipping spring installed in both the 195 and 210? Lift before coil bind, open/close pressures. Thats for the 210 econo ported heads, edelbrock victor e port matched and cleaned up intake, probe shaft rockers, and the Jul 11, 2016 · The AFR heads are nice heads but so are the Profiler heads. bowtie steel heads with 2. J's Performance & Chad from Speier Racing Heads have done a GREAT job on the Pro Filer "Air Wolf" This is not a sales ad, Just a hats off to them. 155 bore fixture Intake 2. Maybe they switched back to Pro-Filer. I heard the vortec heads flow better then the DH. Why buy a set of heads with the wrong parts when we can build you a custom ported set of heads complete, ready to bolt on with the right parts. 003-. Went to the ProMaxx site and checked them out, and they seem to be comparable to the Profiler All-American 210 heads. 070" by trmnatr » Fri Oct 23, 2009 8:04 pm Sep 26, 2010 · The combo is very similiar to mineexcept I have Trick Flow 195 heads worked by Chad I can post the flow numbers after his work. Sep 29, 2009 · From what I've seen with the two heads in question I think the Pro Filer would sure give the AFR head a run for the money. Air Flow Detail #176X SBC CNC All American Head - 235cc Runner Pro Filer Small Block Chevy CNC All American Heads with 235cc Intake Runner, 2. 60 "econo" ported") Holley 300-25 Strip Dominator intake ( gasket matched) JDR performance carb (820-840cfm) 1. The sound is messed up at the beginning. The flow numbers look pretty promising according to their site. Sep 24, 2008 · you are aware theres reasonably priced aluminum heads designed for a small bore sbc that out flow standard vortec heads, so don,t think those are automatically your best option. 08 valve . Air Flow Detail #176 SBC All American Head - 210cc Runner Pro Filer Small Block Chevy All American Heads with 210cc Intake Runner, 2. There not made by anyone else. 100 and the 210 heads have it raised a full . They are there own casting and put out some amazing number in flow data aswell as et's great choice and they are a fairly new company and have very little info on the web about them. These heads allow my destroked 400 to make 17 215cc LS1/LS6 Chevy Racing Cylinder Heads by Pro-Filer Performance 215 Series. All assembled in our shop. Dec 2, 2011 · Below are the numbers for the Pro-Filer 210's intake & exhaust ports, the intake ports are as is and they are bowl blended with the valve upgrade. If you're comparing heads that are all the same size runner, then you can just compare the flow numbers to each other, but you also want to look at some of the lower lift flow numbers (i. Some of the heads with large flows and big runners are not going to be good street heads, since they will have slow flow through the runners at street rpm. The AFRs outflow the Profilers on exhaust tho, but the Profiler are about 500 bucks cheaper. They use the same Nov 21, 2010 · Not sure exact flow numbers but should be slightly better than stock 210 CNC PC heads. 850" exhaust valve. Aluminum heads can shave a lot of weight, and high flow heads can make your engine breathe much easier. BRODIX,TRICKFLOW,DART,PROFILER etc. Dec 19, 2013 · while thats a very valid point, the after market aluminum heads, from standard 23 deg. 200, . Intake Stock Ported . Did you like the heads? Apr 19, 1992 · Pro-Filer small block Chevy All American cylinder heads have a 23 degree valve angle, providing bolt-on compatibility for stock accessories. If he would go with new heads, maybe Chad could set up a set of these for his engine May 25, 2011 · And your right in looking for mid range lift numbers 400" area thats where all your usable power will be and sorry to say these profilers will stomp a afr all day long, and do to there awesome design and r&d from Darrin morgan of reher morrison who help develop these heads they will havea true seat of the pants differant feel to them ecs off . 200 135 110 . 400" Intake Valve and 1. Sep 23, 2010 · Here is what we posted on another thread about the Pro-Filer 210 "as cast" heads in bold However due to the nature of this engine, we upgraded to 2. May 23, 2021 · An in-depth review of the Profiler 185cc head with real flow numbers. generally flow enough more over and above the flow levels available from the stock chevy and stock production 170cc vortec heads to make significantly better power. They're fully assembled with valve springs, retainers, locks, guide plates, studs, and seals. 02 Valves. Oct 11, 2009 · Pro Filer "Air Wolf" By Dr J's Performance/Speier Racing Heads These guys, Bryce from Dr. My dyno was around 506 horse at 6600 and 467 ft lbs of torque at 5100. both heads may flow the same at . In testing on engines ranging from 540-632cid, the Sniper-X has shown gains of 25-35 Ft. 60" exhaust valves. Got the heads installed tonight. The ones for $1500 are the Speier econo ported versions that flow a tad better. No more guess work. Check their website. Look at the information on the heads 220cc Air Wolf Oct 2, 2008 · Performer RPM small-block Chevy heads are also available bare, or complete with 70cc combustion chambers and angled spark plugs. Then, choose your bore (looking down) & stroke (looking across). 550" so I curious about the ATK head. Here are the before and after numbers. 600 222 exhaust at . They both have pretty close air flow on intake and exhaust @. Same exhaust port as 185cc. 688 1. and 35-45 Hp! These heads have incredible flow numbers, yet retain very high air speed due to its smaller 375cc port volume. 455" venturi x 1. Website: www. Nov 12, 2010 · anyone running the patriot 225cc SBC heads? the flow numbers look really good almost as good as an afr and better than the profiler heads or edelbrocks new e-210 heads These newer as cast design flow basically as good as there cnc heads 287 intake at . A buddy of mine needed to buy a set of heads this week and I actually steared him towards ProFilersuntil I started looking into it closely and the flow numbers told a story I didn't like. car is more street than strip, but currently runs 9. 600 in Valves, 210 cc Intake, 64 cc Chamber, Aluminum, Small Block Chevy, Each Mar 20, 2015 · Sbc Profiler 210 heads by speedmachine » Fri Mar 20, 2015 9:53 pm I received a customers heads the other day and am just getting to assembling them. 300 197 - SBC Cylinder Head Info - I've compiled the following information on SBC Cylinder heads to help compare them. You can clearly see the CNC Marks in the "Comp" heads. Like all Edelbrock heads, they're cast at the Edelbrock Foundry from 356-T6 aluminum and incorporate Heli-Coil inserts in the rocker stud and exhaust bolt holes for strength and durability. NOTES Flow curve with Manley Titanium 11429 and 11430 valves. They also have the ability for future upgrade, Speier has them flowing over 300cfm with port work. Here's the specs- 4. engine is a 383, victor jr intake, bullet solid roller,240/240 @ . . 050 108° ic, 112°lc . 6 1050 Quick Fuel 4150 annular Chinese Bowtie Feb 22, 2009 · Re: Profiler SBC Heads? #2 by John_Heard » Mon Feb 23, 2009 1:14 pm There is a new SBC head coming out pretty soon from Pro-Filer, call them up and talk to them about it. 155 bore. THESE HEADS HAVE HIGH QUALITY SEATS AND BRONZE GUIDES AND USE STANDARD SBC VALVE TRAIN PARTS. 8:1 with 64cc) New last year, 500 miles or so on it. com Jun 27, 2018 · profiler 185cc with 2. The Pro filer 195 may in fact not have the flow numbers of the AFR head, but flow numbers don't tell the entire tale, port velocity also plays a huge role and that's where the profiler shines. Timing was best of 38* and lash at . I tried calling pro filer today a few times and got nothing. I have really nice Dynatech headers that I think Oct 4, 2009 · Ok, who out there is running or has ran the 12* Profiler spread port bbc heads? How did/do you like them? How do they compare to Big Chiefs or Brodix PB1200's? I've got a guy making me a killer deal on a set that's been cnc'd and the numbers are pretty close to the others mentioned. 62, at 3850 Dec 10, 2020 · building a small block 355. i was considering profiler 210's or brodix dragonslayer heads. Aug 11, 2023 · Free Shipping - Pro-Filer Performance Products Small Block Chevy All American Cylinder Heads with qualifying orders of $109. Question for Eric, how accurate are the flow numbers on the Promaxx website? Feb 15, 2011 · AFR 220 Dart 227 Pro-Filer 210 Almost any professional ported Dart, Pro-Filer, AFR etc thats 23 degree Oct 29, 2010 · That is in no way a knock on the ProFiler heads, I just don't have any experience with them. 05" Intake Valve and 1. So I started looking into them. Anyone running these heads or have any build combos using them? Aluminum Cylinder Heads - Chevrolet - Small-Block - E-Series - Edelbrock, LLC. I thought I would post because there are many SBC guys and these heads are extremley good! One of the untold stories at looking at raw flow data is the hidden aspect of velocity. I give a full break down of the Profiler SBC 235cc CNC ported heads with flow numbers. Pro Filer Hitman Spreadport Big Block Chevy Heads with 415cc Intake Runner, 2. plan to run a tunnel ram (cool). Flow measured at 28" of depression. Wondering if they would be better Oct 23, 2009 · The Darts & Pro Filer "As Cast" are a head that costs less but about the same price between the two, The AFR and Air Wolf from Bryce/Chad are with in dollars of the AFR. They were flowed on a 4. 696-. 005 depending on wich valve you check. The features for the IK® series small block aluminum cylinder heads include a revolutionary ultra casting, versatile 180 cc, 200 cc, or 210 cc intake ports. Phil May 7, 2022 · Saw a video review on YouTube about a promaxx head. They are the part #1054 AFR 210cc eliminator sbc heads. That 400 combo should be a easy 525 plus horse, more then enough to make that nova real fun on the street. I checked them out real close and noticed that the exhaust Jan 25, 2014 · Looking for information on aftermarket heads like Brodix, TrickFlow, Edelbrock, Profiler, Patriot, AFR. Oct 30, 2010 · I think there is some talk about a 388 on here somewhere with Chad's heads on it, Profiler 210's with the econ port work that made some good numbers. The 195's the exhaust valve is raised . So much that his stud girdle is so tight when it's on it moves the lash by . BES Racing Engines now offers complete cylinder head packages. The most common cylinder head recommendation that we suggest is listed below the cubic inch. (I might have to change) Haven't heard much about Profiler lately. Engine Size: 210cc - 383cid-427cid / 7000rpm Air Flow Detail #176 SBC All American Head - 210cc Runner Pro Filer Small Block Chevy All American Heads with 210cc Intake Runner, 2. I guess a better way to say it is the ONLY WAY a typical (when I say typical, I mean other CNC Ported Heads) CNC Ported Head looks like that is with a CNC Port and blend/polish You are 100% right, you can see every CNC mark in them. 500 298 Intake at . For some builds, stock heads are just fine, while a custom porting and polishing job may just be the ticket I tell the dyno numbers from the two different heads. All in the 180, 190, 195, 200, 210, 215 range. The bottom end is pretty good. While they aren't quite what is advertised, they're pretty darn close. Feb 22, 2022 · I just stumbled across the ProMaxx "Project X" SBC heads on Summit's site. Jul 20, 2010 · Re: AFR 220 "Competition" & AFR 210 "Race Ready" Tony, Im not saying it is hand blended or polished. This head has everything thrown at it and moves a ton of air for a standard port 23º!! Air Flow Detail #222 All American SBF Head - 205cc Runner Pro Filer All American Small Block Ford Heads with 205cc Intake Runner, 2. Also exhaust flow. 300?). Sep 26, 2010 · Lunati Roller Rockers- 1. 3-192 199 . State of the Art Cylinder Heads and Intake Manifolds for Racing and Street Performance. 100 74 cfm . 060'' bore. There located right here in Ohio and with Sep 27, 2010 · Congrats on an awsome build! Pro-filer makes really nice heads and you cant beat the price! 69 Z/28, red/white stripe, black houndstoot with docs. THIS IS A CYLINDER HEAD PACKAGE THAT YOU ASSEMBLE. /Lbs. That IMO would be the "BEST" small block head test possibe with some of the best small block heads out there. Something like 580 hp or so if I remember right. wengines. 581 lift at valve. Dec 22, 2014 · A +0. 300 201 145 . I flow an Edelbrock E-210 SBC head and tell you what I think. Get big power on a small budget with BluePrint Muscle Series cylinder heads! These lightweight aluminum heads bolt up to your small block Chevy and feature 195cc intake/75cc exhaust runners, 64cc combustion chambers, and 2. 030 bore with a little effort flow that well . Apr 24, 2009 · Thanks guys for the pictures and numbers. They appear to be done very well. 08 intake valves. Pro Filer "As Cast" 210 Flow Numbers on 4. Jun 16, 2010 · Well, there's flow numbers. This is basically what I'm going for, but would like to stay with a hydraulic roller as the car gets driven 2-4k miles a summer at least. I see the have a X series with 185 intake runners. For example, we have seen as much as 15-20 cfm difference in stock heads that have the same part numbers. This is a long video but I have a lot of information about both heads and real flow numbers. 60" exhaust valve. Jun 15, 2017 · I was originally looking at the Promaxx heads but stumbled across the Edelbrock E-210's. 055/1. it has forged flat tops . 6/1. They are the bare as cast. Jun 29, 2006 · This info relates to the "Chinese/Australian" BBC heads being sold under various brands, but they ARE from a single foundry. 5-278 May 7, 2014 · One set of Pro Filer's with a 2. Flowing a stock sbc Afr 210 and swing if having the rocker stud sticking down hurts flow. Have concerns about the raised exhaust valve position in these heads. The engine combinations listed below are the most common in the Aug 29, 2009 · Profiler 210's are going on my 406 imo the best head out there. May 24, 2016 · currently have brodix track 1 heads, and it would like to go with something that flows more but don't want to refi the house. Oct 23, 2009 · Pro Filer "As Cast" 210 Flow Numbers Jump to Latest 16K views 76 replies 15 participants last post by trmnatr Nov 5, 2009 T Jul 24, 2024 · Profiler 210 heads out of the box, made 585 HP at 6400, 550 ft lbs of torque at 4800. 600" exhaust valve. The stock profilers will easily flow what the others do with room for future porting. All heads available with Available with COMP, Brodix, and other valve and spring combinations. 200 145 110 . 050, . 600 Aug 30, 2009 · A buddy of mine runs a set of pro comp heads on his sbc, and the rocker boss placement is off or not straight. 080 / 1. and flow rate Oct 16, 2020 · The 185cc 195cc or 210cc all cost the same $632 per head. 02" Intake Valve and 1. So, our "stock flow" is an example of stock flow. Since my Air Flow Detail #174 BBC Sniper Head - 375cc Runner Pro Filer Sniper Big Block Chevy Heads with 375cc Intake Runner, 2. Jan 8, 2011 · Profiler 210 SBC heads are $1000 flat built with valves and springs. The dyno test was run on 93 octane. I also compare it to the Profiler 195cc Re: FlowBench numbers on various SBC heads 07-03-02 05:41 PM - Post# 113465 In response to MaxRaceSoftware Larry, what causes the high lift flow to fall off with certain heads (such as the 230cc Pro-1's you've listed)? Is it a matter of short turn radius, bowl work, valve size? My heads do the same thing after . Many other heads in stock as well as manifolds and rocker set-ups. The flow numbers seem better than vortecs. Anyone running them or any promaxx sbc head that they could give some input on. I also show many other things with the two heads like flow numbers, cc, and measurements. Contact info:w I go over the differences between the two sbc AFR 195cc heads including flow numbers from my flowbench. It was about 16-18 months ago. Anyone want to throw out there understanding and beliefs about cross section of cylinder heads and how they relate to cam profiles? From my current leave of understanding. SBC 180cc – View More Details SBC 200cc – View More Details SBC 220cc – View More Details BBC 290cc – View More Details BBC 315cc – View More Details BBC 320cc – View More Details BBC 360cc/133cc – View More Details BBC 360cc/121cc – View More Details BBC 375cc/127cc – View More Details BBC […] I evaluate and flow a set of Profiler 210cc sbc heads. look this is not a guessing game (selecting the correct port size, there are known guidelines )you select and verify the correct port size and cross sectional area, using know calculations, valve diam. 02 Valves . Chevy cylinder head Identification - Small block casting numbers, Big block cylinder head, camel back heads, double hump heads Making more progress on the Gen 1 SBC. 4-245 249 . e. 125" Intake Valve and 1. Flow data based on Cylinder #1 intake and exhaust port. I was previously looking for a Profiler 195 head for a 355 pump gas deal but after numerous calls and emails to Profiler a month ago that went unanswered, I might give these a try. First, pick your compression. be aware any vortec heads you choose must have matching components that are not necessarily the same as the PRO-FILER ALL AMERICAN 23 DEGREE SMALL BLOCK CHEVY CYLINDER HEADS FEATURE AS CAST TECHNOLOGY GIVING PORTED HEAD FLOW NUMBERS AT AN AS CAST PRICE. Shop Cylinder Heads at Summit Racing. 040 over small block Chevy 400. 6 valves, we choose to do the PAC spring upgrade, Titanium retainer upgrade and Pro Filer suggests using their Race Valve Job which is in the price EXCEPT for a $25 charge for a special back cut. 500 215 exhaust at . 500 265 206 . Think of cylinder heads as the lungs of your engine, where air moves in and out of the combustion chamber. 600 270 213 195cc with 2. From mild street to serious bracket racer, we have a combination for you. 6exh Pro-Filer 210s done by Chad Speier ( 2. Jul 25, 2024 · I didn't realize how much of a bargain the X series heads were. Apr 24, 2020 · Re: AFR Enforcer SBC heads by mag2555 » Fri Apr 24, 2020 11:33 am Well, they sure don't have the flow numbers I would like to see for a 195 CC runner head, but this was likely there intent! Then again AFR heads typically rework/ port up very easy, so gaining 25 cfm of Intake flow should not be a big project! 8. 250 inch. 523 lift cam hyd roller. 08" Intake Valve and 1. What does everybody think? I talk about the promax small block Ford 185 cc cylinder head and show the flow numbers. Eagle crank, 6" rods with Mahle pistons (11. Our combinations are proven. 60 valves. 2-133 144 . Flow numbers seem to be almost exactly the same as Profiler on intake, higher on We stock cylinder heads from World Products, Dart Machinery, Brodix, Profiler, and Ohio Crank. Specializing in big block chevy ,small block chevy, big block ford and small block ford. For the flow remember bigger is not always best. This produces better overall torquw, better shift recovery and much lower ET’s than the larger port heads, even on 600+cid May 20, 2011 · For a street car, find a cam that will take advantage of the heads mid lift flow number, that's very important. They seem very well built, however I have aftermarket valves and 8. but are better heads for the cost of vortecs. But there can be probelms here too. 500 273 206 . With the stock valve sizes, angle plugs, 64cc chamber, and single or dual valve springs. 05 valve on a 4. 2. I've used about all of 23° heads and had them across my bench at one time or another. 500"-0. 055'' valves trapping 7500 to 7800 RPM on 383 and 400 cubic inch engines. Jan 4, 2022 · Re: ATK Aluminum SBC Cylinder Heads by 65dragster » Wed Jan 05, 2022 7:04 pm I would give them a call. We can also supply you with a matching camshaft and intake. 3ciqm3pygzvuzowxej6u7gqfebaygeudmeqfwbygyqu3ppdjx