Gen IV ('05+) had a lot of different 6.0l engines. Of course LQ9s will cost a bit more, but the 10:1 compression will make more power and still work fine on cheaper gas. . Bore: 4.070 in. The LQ9 is a limited production engine and VERY desirable as it is the HO 6.0L and comes with a premium price. SRP Small Block Chevy High Compression Forged Pistons. The store will not work correctly in the case when cookies are disabled. Pin, Chevy, LS, Set of 8. The LQ9 is a limited production engine and VERY desirable as it is the HO 6.0L and comes with a premium price. The piston volume is 0cc. D.S.S. Find a Dealer. Compression Height, 0.927 in. I paid 350 for the pair of heads. Head CC - Comp Ratio. 2cc Flat, Std. Maybe it should be phrased as "reasonable compression for pump fuel with optimum timing vs. higher compression with reduced timing to stop detonation". I know the later model 6.0 trucks gm bumped the compression to 9.8:1. The LQ9 had flat top pistons, giving it higher compression. 2022 Yamaha YZ450FX POWER, TUNED TO PERFECTION Whether cutting through tight technical trails or blazing across the wide open desert, the class-defining YZ450FX takes off-road performance to new levels. The LQ4 ratings were anywhere from 300hp in the 2500/3500 series trucks to as high as 335hp in the 2006 Yukon Denali's. As stated earlier, yes there are some mechanical differences between the earlier model LQ4's and LQ9 that are beefier components such as the rods and flat-top pistons with coated skirts and floating pins, but other than 6-tenths higher compression there are no mechanical . Now on the Gen IV's the 5.3 and the 4.8 both use the same flat top piston and the same heads thus the 4.8 gets to be a low compression slug and the 5.3 got a . I don't think you would see 450HP with just a came, tune, and bolt-on with the lower CR LQ4. The LQ9 used a flat-top piston, which is why the 10:1 compression is a bit higher than an LQ4. Most notable are the LQ4 and LQ9 Vortec, used in the GM's 1500 and 2500HD . (0) Reviews: Write first review . The heads are the 317 for both motors. Except for this component, the engines are quite similar to each other. Although the LQ9 is the HO (High Output) 6.0L it came in a 1500 chassis. And the main cap style is 6 bolts. . tech@uempistons.com. 243's and flat tops is going to be a bit on the high side compression wise. Flow numbers can be as high as 325 cfm at .600 lift. As you can see in the video, as the nitrous comes on, a visible puff of something come out from under the hoodthis was the second kit blowing loose. Gen III ('97-'07) had the LQ4 and LQ9. The kits are kinda expensive. Summit Pro LS 4.8, 5.3, 5.7, and 6.2L mid-compression pistons increase compression over point before milling the heads. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. Compression Ratio @70cc: 9:1. but I think you stated in another thread that's what you want so. Alloy : Pistons: Piston and Ring Kits: SX: 6.2 / LS3 / LQ4 / LQ9 / LY6: 3.622" 6.125" 1 . . # 1040 Corbett St., , Carson , NV 89706,USA. The LQ9 came with flat top pistons. I could always use more power, but power to $ ratio is high and brings many smiles per mile. mostly my opinions and what has worked oner the years. Lightweight hollow stem LS3 valves can be cut to 2.000 in. Forged 2618 High Strength Aluminum Alloy. LQ9s have flat-top pistons while LQ4 pistons have a distinctive dish. Specs: 2002 LQ4 bored out 20 thou to 4.02 Speed Pro h1129cpa .50mm flat top pistons sitting .007 below the deck Felpro 26192PT Bore: 4.100 Compressed thickness .048 Head gaskets Comp cam 54-414-11 XR269HR 216/220 Duration @ .050 inch, .525 inch/.532 inch Lift, 114 Lobe Separation So thats my. The hipo LQ9 has 10:1 compression, which doesn't allow for as much boost and timing, so the improvement isn't as impressive. Stay up to Date with Current Events, New Releases and Special Offers. The LQ4 is ideal for supercharging because of its 9.41:1 compression ratio and 6-liter size. The LS2 has a lighter weight flat top piston (since it needs to rev much higher). On a 4.00" bore of an LQ4 though it is splitting hairs. The 6.0L LQ4 and LQ9 are iron blocks, only difference between them is compression ration. The machine shop thinks I should shave the heads for even more compression. SRP Small Block Chevy High Compression Forged . for more compression. On the Power Curve chart, see Test 2 . LQ4 and LQ9's both used the same crank. 8.206, 9.503, 9.206: in: Piston Diameter at Top Ring Land - usually runs 0.003" to 0.005" less than bore diameter: in: Distance from Top of Piston to Ring Land - may vary from manufacturer to manufacturer: in Contact us. . Save Share. I'm running stock 100k+ low compression LQ4 long block, lifters, pushrods, timing chain, 317 heads, LS6 intake, flex fuel 33lb/hr junkyard injectors, Elgin e1839p cam (220/224, .575" lift, 108 LSA, and PAC 1218 springs. 03-05-2015 #4. askkmb. THE FREE UPGRADE IS A $149.95 VALUE! Features may include: ENGINE Rearward-Slanted Cylinder Design The YZ450FX's distinct rearward-slanted cylinder designcomplete with rear exhaust a. There are several iron-block 6.0 liter LS engines from the factory. $1,089.82. It's also coated with a heat rejection cotasing top and sides. Leading the way in affordable piston technology is Sportsman Racing Products (SRP) Pistons. Gen III's used a 24x reluctor wheel. I am building an LQ4 for my project. Do you think I'd have any issues. 4.8's always had a flat top and the 5.3 was dished. I will measure when time comes but just want to ask around . Our collection of high-performance pistons for sale are crafted from the finest metals, plus we have options that are compatible with both standard and oversized bores. With the 317 heads my compression ratio will be about 10:1. What is a reasonable compression ratio for an NA engine? The LQ4 is one of the most popular engine swaps with its larger displacement and its cast iron block that will support big power! Bore, Forged, Dome, Please Verify Piston Pin Diameter Before Ordering, Chevrolet, 6.0L LS, Kit Part Number: WIS-PTS523A3 4.67 out of 5 stars ( 3 ) The main difference between a LQ4 6.0L and the more desirable LQ9 is the LQ9 has a high static compression ratio. The modest difference in rated power output is a function of the difference in compression ratio, and refinements to the LQ9's cylinder heads. This translates to 15 kW and 14 Nm, providing 345 hp or 257 kW power output. Kits include high quality components including an Eagle Forged 4340 Steel Crankshaft; Eagle H-Beam Rods; Arias or Mahle Premium Forged Pistons; Hastings Rings; and high performance Clevite or . I do not always have premium available (over $4.50 for 91 octane in our area currently) and 87 is everywhere . It will end up just like the gen 3 pressed rod/piston. LS2's I haven't confirmed it yet but I believe so. We wanted a minimum 6.0 liters (366 CID) of displacement and an iron block for strength. Stock pistons on both are kind of weak and fail. This means removing the cylinder heads or using a Borescope. 2022 Application Guide Download [PDF; 14 MB] The MAHLE Motorsport PowerPak kit is our high volume shelf stock program developed for high performance enthusiasts and sportsman class racers. L92/LS3 Chevy PowerPak Piston & Ring Kit. . Brian Tooley Racing 21 items; Chevrolet Performance 1 item; Diamond Pistons 117 items; DSS Pistons 16 items; JE Pistons 4 items; Wiseco 196 . Stroke, 6.125 .927 Rod, NA/Boost/Nitrous, Cathedral/Rect. This then . I honestly think 10:1 might be a little high and should knock it down closer to 9.5:1. You can use gen 4 floating pistons on gen 3 pressed piston/Rod but you can't go the other way. The compression and the prices are different from each other. Description Technical Specs Engine Info This is an LQ4 based engine with LS3 Aluminum heads making a very streetable 550HP+. I did some research and the 383 was good for my. LQ9s have flat-top pistons while LQ4 pistons have a distinctive dish. The 243's have bigger valves which do better on 4.0" and larger bores. Now I want lq4/lq9 motor for my ss. The engine specs and information listed here is for the stock LQ4 engine. Changing pistons and/or cylinder heads will allow you to change the compression ratio. Not much of a change at all. Pistons, Pro Tru Street Pistons, 4.030 in. Piston Top: Compression Ratio . Different applications had different HP and TQ numbers throughout the years. The Magnuson supercharger system shown here is being installed on a Hummer H2 LQ4 6.0-liter V-8. New alloys are being developed to keep the cost down, but maintain quality. For marketing purposes, it was also known as the Vortec 6000. A lot of peole think they have a LQ9 and pay/sell it for premium and then come to find out it's a LQ4. The LQ9 has a flat top piston, for higher compression (10.08), but it is also higher quality. If you want the magic number "500hp" Buy higher mileage LQ4 and stroke it to a 408, flat top pistons, add cam, larger injectors and just have the 317 heads ported. Pin Diameter: 0.927 in. Plus new/used block ls1/6. Between the light valves and better springs, the engines will pull cleanly to 7000 rpm. 6.0L LY6 LQ4 LQ9, Set of 8. Nevertheless, Matt broke into the 1,000-horse range putting down an astonishing 1,076.85 horsepower and 1,027 lb-ft of torque with just the one kit of nitrous. . Mahle Motorsports Pistons GM LS PowerPak Piston & Ring Kits. That is about 380 lb-ft of torque or 515 Nm. We set out to assemble a 500-ish horsepower, high-torque LS engine for one of our projects, a 1971 Buick GS. The LQ9 had injectors with a slightly higher flow rating. to fit the seats. The 10-10.5 compression LS1, LS2 & LS6 I feel comfortable with 11-13 PSI on forged pistons and 9-10 PSI with stock pistons. Even though the machines are similar, LQ4's piston is dished while LQ9's is flat. I have an lq4 I want to swap into my obs and I want to throw on some 243 heads milled to 62cc with a btr stage 2 227/234 614"/.576" 113+2. Only difference is a little higher compression. A stock LQ4 and LQ9 tune are nearly identical. This style of the piston increases the compression ratio and horsepower of the engine. Upgrading LQ4/LQ9 Cylinder Heads The stock heads can be CNC ported for more airflow and milled up to .030 in. SUBSCRIBE. The main difference between the LQ4 and the LQ9 engine is all about pistons high static compression ratio. Cylinder Blocks. MAHLE Motorsport PowerPak and PowerPak Plus piston kits offer superior reliability and performance, letting you take your LS build to the next level. ATK SP19 Chevy LQ4 6.0L Short Block OE Dish Pistons Our Price (USD): $2,800.00 The main difference between the LQ4 and the LQ9 engine is the pistons and LQ9 have high static compression ratio. Swapping the pistons over to one of these 2 will bump the compression and let me have more options with the cylinder heads. For an 11-1 compression setup such as an LS7 & LS3, I prefer to run a max of 6-7 PSI for stock pistons and 8-9 PSI for forged. S . Using this formula, a 402 stroker motor that uses a standard-deck 9.240- inch LS block, a 4.000-inch stroke, and 6.125-inch connecting rods would need pistons with a compression height of: 9.240 - (6.125 + 2) = 1.115 inches Decreasing compression height also decreases weight, alleviating stress on the rods at high RPM. Shopping Options. If you don't have the VIN code, you will need to inspect the pistons. Submit. The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. Only real difference is pistons LQ4 had dished and LQ9 had flat tops (yes rods were different on early LQ4 and 99-00 had iron heads) Only way to tell is look at pistons or vin of donor save for 99-00 with iron heads as its an LQ4. THIS FREE UPGRADE IS ONLY AVAILABLE ON FX SERIES SMALL BLOCK CHEVY, SMALL BLOCK FORD, LS CHEVY, VIPER AND GEN 3 MOPAR HEMI APPLICATIONS. Here's a diy video or just have a machine shop do it for you. A better option would be to get a set of gen 4 rods to go with the pistons. However, you will need to upgrade the internals to handle that kind of power. GM changed pistons between the older Gen III 4.8 and 5.3 to keep the compression ratio about the same using the same 61 cc heads. KB may or may not manufacture a piston with this exact compression height to produce a zero deck clearance. Filter. A dished piston makes it a LQ4 engine while the LQ9 uses a flat top piston. The LQ4 comes with a dished piston 9.5:1 VS. A flat top in the LQ9 10:1. Jump to Latest Follow 1 - 14 of 14 Posts. I know the later model 6.0 trucks gm bumped the compression to 9.8:1. They can handle over 1,000 hp. They produced a rated 10.5 compression ratio on the smaller LS6 engines. The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. The easiest way to differentiate them is to inspect the piston top. Application: Chev LS Gen IV LQ4 Bore: 4.030" Stroke: 4.000" Block: GM 6.0L Cast Iron Gen IV Main Caps: 6-Bolt Main Cap Bolts: OE Crankshaft: Manley 4340 Forged 4.000" Pistons: Manley 2618 Forged Aluminum Piston Dome Type/Volume: -4cc Flat Top, Moly Skirt Coated Compression: 11.4:1 w/ 68cc Connecting Rods: Manley 4340 Forged H-Beam 6.125" With your LQ4 having dished pistons it will keep the compression ratio more in check if you decide to run these heads. With 317 heads . THIS RING SET NORMALLY SELLS FOR $299.95. Some of the old LQ4's had iron heads instead of aluminum. The LQ4 engines are very popular engines to swap into Muscle cars and any other LS Swap vehicle. Add to Cart Please login to add to Quote. Expect big mid to upper end power, will have a noticeable idle. With my last cam that was 230-238 604 604 113, 62cc heads and .40 head gaskets I had plenty of PTV clearance. The optimum intake-to-exhaust ratio could range from as little as 0.75:1 (for a low CR supercharged engine) to as much as 1:0.6 (for a very high-compression naturally-aspirated engine). Part Number . The piston of LQ4 is dished but it is flat in . So you can get a set of flat tops and make your own high compression motor and be further ahead. This short block is built with lower compression perfect for superchargers or turbochargers also will handle up to 700hp. using nitrous, a blower, or a turbo. The only differences were: The LQ4 came with dished pistons. +775-882-7790. After the freshen up and some new parts, this 408 LS engine is making 742 horsepower and running strong quarter-mile times. Friday 7th May 2010. there's always the left-field answer - reduce the stroke a bit. Do you think I'd have any issues. 1.304 in. Of course LQ9s will cost a bit more, but the 10:1 compression will make more power and still work fine on cheaper gas. "I've only had it out a couple times this season so far with the compression change and with the new carburetor, but it's gone a best of 9.84," Siebert says. Chevy released a high . Eagle Competition LS Rotating Assembly, Stroker Kit, LS2, LQ4, LQ9, 4.000 Stroke, 4.005-4.010 Bore, 403-404 cu.in. 5.0 out of 5 stars . Order powerful engine pistons online today at JEGS High Performance. Brand. this video is about picking the right compression ratio for boost in a smaller displacement engine. With the 317 heads my compression ratio will be about 10:1. The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. The 4.8L/5.3L results make sense since an increase of 1 full point in compression is worth roughly 4 percent power and at 430 hp a 4 percent gain is 17 hp. fit . Flat-top pistons (with or without valve reliefs) are the typical choice for standard to high-compression engines, but high-performance engines . Almost $2000 for just the kit. For optimal Performance you will need headers, chassis dyno tune and 36lb injectors. -31cc Inverted Dome Volume. I am using 243 64cc heads from a 01 Z06 vette in place of the 317 and the LS6 intake. . IMO a LQ9 isn't worth the cost difference from a LQ4. I have an lq4 I want to swap into my obs and I want to throw on some 243 heads milled to 62cc with a btr stage 2 227/234 614"/.576" 113+2. When SRP Pistons joined the JE Piston family, new pistons were developed that added some of the features that you see on race pistons to the budget friendly line of SRP Pistons. I need some help from you. With an LQ9 and good gas it would be easy. '71 Malibu: 3580 #, 6.0 LQ4, Summit pistons, 244/[email protected] 637/612 Jones cam, Holley Split Race, QFT 1050AN, msd 6014, 11.5:1, T-350, 501 Converter, 12 bolt, 3.90 gears The machine shop thinks I should shave the heads for even more compression. It featured high compression flat top pistons to deliver an added 20 horsepower (hp) and ten lb-ft of torque. I honestly think 10:1 might be a little high and should knock it down closer to 9.5:1. The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. Forged Pistons Are Stronger And Longer Lived Than Cast Pistons. 45. From LS1 to LS7 the forged LS Piston sets are available in Flat Top, Dish, and Dome with the choice of 2618 or 4032 alloy. Wiseco Forged Flat Top Pistons 4.030 Chevy Small Block LS 6.0L LS2 LS6 LQ4 LQ9 Brand New C $796.44 Top Rated Seller Buy It Now +C $94.50 shipping estimate from United States 166 watchers Wiseco Forged Dish Pistons 4.030 Chevy Small Block LS 6.0L LS2 LS6 LQ4 LQ9 Brand New C $783.99 Top Rated Seller Buy It Now +C $94.27 shipping estimate With my last cam that was 230-238 604 604 113, 62cc heads and .40 head gaskets I had plenty of PTV clearance. They would normally produce more on a 6.0 LQ9 with flat top pistons. (You may need to lower the compression to run with boost.) In fact, the LQ9 uses LESS spark advance in the Low Octane table - due to its higher compression ratio. Piston Specs: The LQ9's piston style is flat-topped. The bore spacing is also the same as the LQ4's bore spacing. LS PowerPak & PowerPak+ Piston Kits. Changing the factory dished LQ4 pistons for factory flat tops from a LQ9. Part Number: SUM-2999274030-2. Any LQ4 from an Escalade or Denali will have . GM Powertrain engineers delivered a cost-effective, assembly-efficient alternative to distinguish the 6.0L LQ9 from the LQ4 and deliver the additional power Cadillac wanted: flat-top pistons that increase the compression ratio from 9.4:1 (for the LQ4) to 10.0:1. 1) Swap the LQ4 pistons for either LQ9 or LS2 pistons and rods. deepen the combustion chambers in the head a tad. A while ago I posted a thread asking some feedback on 383/402 stroker kit. SRP. Our LQ4 pistons have a very slight dish and hence a touch less compression. Jan 21, 2009. Here is a basic and simple guideline I use at my shop. Keep in mind also thatalong with cylinder head combustion chamber size, type of head gasket used, and other factorsthe shape of the top of the piston will dictate your engine's compression ratio. The LQ4 piston is a dished design, cast piston. In terms of the LQ4 engine, its piston is dished, while the LQ9 engine has a flat top piston. ATK SP26 LS 408CI Stroker Short Block +10cc Dish Pistons 58 Tooth This short block is built for all motor builds with higher compression but with the option of running pump gas it will hold up to 700HP. Jking - FBJ answer all I was going to say..he's my go to guy for tech info when I get stuck. . This is often the case when one goes too far with the compression & then tries to pull timing so it can be driven on pump fuel. GSX And XR Pistons Come Standard With The Patented X Groove Which Fights The Damaging Effects Of Fuel Washdown And Wear Debris. Compression Height - distance from CL of wrist pin to top of piston: in: Deck Height - e.g. Designed to work with LS3 Style Heads 4.070" Bore Dome Piston High Compression 12.0:1 - 15.2:1 (determined by gasket and milling) Effective Volume of +8.3cc Large .200 Valve Reliefs The Definitive Max Effort NA LS3 Piston & Rods Package! A one-point increase in compression nets a roughly 4 percent increase in power. I can get stock LQ9 pistons for $43 ea and new LQ9 rods for $46.70 each In the case of a 500 crank horsepower engine, that's another 20 horsepower for free! Cylinder Head Specs: LQ9's cylinder is also made up of aluminum. I will measure when time comes but just want to ask around . Check Price On Amazon Many users widely use the LQ4 and the LQ9 engines. The dynamic compression ratio (DCR) is computed from the position of the piston at the point of IVC to . (This raised the compression ratio, horsepower, and torque.) Q Wondering if ss4 cam will be ok on valve to piston clearance on a stock lq4 ? Needs. but, yes the more sensible answers are all here :-. The purpose of the dish is to reduce compression to 9.4. View Details. The static compression ratio (SCR) is computed using the full swept volume of the cylinder from BDC to TDC compared to the volume of the combustion chamber, valve reliefs (or dome), and all the other volumes not occupied by the piston stroke. The PowerPak pistons are made from either 4032 aluminum alloy to allow for tighter cylinder to wall clearances and improved temperature stability, or 2618 . East Coast Outlaw 10.5 Standout Brian Chin Keeps Upping The Ante . BTR PISTON SET - 4.065" BORE - 4.000" STROKE - 6.125" ROD - 5CC FLAT TOP - BTRP416125FT5-8 $549.99. Find CHEVROLET 6.0L/364 Pistons & Piston Rings and get Free Shipping on Orders Over $99 at Summit Racing! The LQ4 and LQ9 have very strong blocks. Diamond Adds Chevy LT Engines to the 2K Piston Series Diamond's highly regarded "2K" series of shelf-stock forged aluminum pistons for robust 2,000 horsepower power-adder builds has been expanded to include the LT2K model to complement Chevy Gen V LT1/LT4 cylinder heads. Plus your pushrod length will be off by quite a bit.