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. ATK SP19 Chevy LQ4 6.0L Short Block OE Dish Pistons Our Price (USD): $2,800.00 The hipo LQ9 has 10:1 compression, which doesn't allow for as much boost and timing, so the improvement isn't as impressive. A one-point increase in compression nets a roughly 4 percent increase in power. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. Features may include: ENGINE Rearward-Slanted Cylinder Design The YZ450FX's distinct rearward-slanted cylinder designcomplete with rear exhaust a. The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. Brian Tooley Racing 21 items; Chevrolet Performance 1 item; Diamond Pistons 117 items; DSS Pistons 16 items; JE Pistons 4 items; Wiseco 196 . GSX And XR Pistons Come Standard With The Patented X Groove Which Fights The Damaging Effects Of Fuel Washdown And Wear Debris. The store will not work correctly in the case when cookies are disabled. The main difference between the LQ4 and the LQ9 engine is all about pistons high static compression ratio. The 6.0L LQ4 and LQ9 are iron blocks, only difference between them is compression ration. IMO a LQ9 isn't worth the cost difference from a LQ4. Although the LQ9 is the HO (High Output) 6.0L it came in a 1500 chassis. THE FREE UPGRADE IS A $149.95 VALUE! Gen IV ('05+) had a lot of different 6.0l engines. Gen III ('97-'07) had the LQ4 and LQ9. 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. Shopping Options. The LQ9 had flat top pistons, giving it higher compression. # 1040 Corbett St., , Carson , NV 89706,USA. The LS2 has a lighter weight flat top piston (since it needs to rev much higher). 1) Swap the LQ4 pistons for either LQ9 or LS2 pistons and rods. Find a Dealer. View Details. 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. The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. The modest difference in rated power output is a function of the difference in compression ratio, and refinements to the LQ9's cylinder heads. 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. Forged 2618 High Strength Aluminum Alloy. Mahle Motorsports Pistons GM LS PowerPak Piston & Ring Kits. The LQ9 is a limited production engine and VERY desirable as it is the HO 6.0L and comes with a premium price. . They would normally produce more on a 6.0 LQ9 with flat top pistons. I will measure when time comes but just want to ask around . The piston of LQ4 is dished but it is flat in . LQ9s have flat-top pistons while LQ4 pistons have a distinctive dish. The machine shop thinks I should shave the heads for even more compression. 4.8's always had a flat top and the 5.3 was dished. The LQ4 piston is a dished design, cast piston. The LQ9 had injectors with a slightly higher flow rating. Piston Top: Compression Ratio . And the main cap style is 6 bolts. The kits are kinda expensive. 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 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 main difference between the LQ4 and the LQ9 engine is the pistons and LQ9 have high static compression ratio. It will end up just like the gen 3 pressed rod/piston. Changing the factory dished LQ4 pistons for factory flat tops from a LQ9. "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. The PowerPak pistons are made from either 4032 aluminum alloy to allow for tighter cylinder to wall clearances and improved temperature stability, or 2618 . The only differences were: The LQ4 came with dished pistons. I honestly think 10:1 might be a little high and should knock it down closer to 9.5:1. This then . Changing pistons and/or cylinder heads will allow you to change the compression ratio. I need some help from you. Alloy : Pistons: Piston and Ring Kits: SX: 6.2 / LS3 / LQ4 / LQ9 / LY6: 3.622" 6.125" 1 . Jump to Latest Follow 1 - 14 of 14 Posts. Flat-top pistons (with or without valve reliefs) are the typical choice for standard to high-compression engines, but high-performance engines . Submit. I will measure when time comes but just want to ask around . Upgrading LQ4/LQ9 Cylinder Heads The stock heads can be CNC ported for more airflow and milled up to .030 in. The LQ9 used a flat-top piston, which is why the 10:1 compression is a bit higher than an LQ4. Do you think I'd have any issues. Pin, Chevy, LS, Set of 8. I honestly think 10:1 might be a little high and should knock it down closer to 9.5:1. Compression Ratio @70cc: 9:1. A stock LQ4 and LQ9 tune are nearly identical. Chevy released a high . SUBSCRIBE. Of course LQ9s will cost a bit more, but the 10:1 compression will make more power and still work fine on cheaper gas. S . 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. The LQ4 piston is dished where as the LQ9 is a flat-top increasing compression to 10:1, and HP to 345 factory. In terms of the LQ4 engine, its piston is dished, while the LQ9 engine has a flat top piston. 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. Of course LQ9s will cost a bit more, but the 10:1 compression will make more power and still work fine on cheaper gas. Different applications had different HP and TQ numbers throughout the years. 6.0L LY6 LQ4 LQ9, Set of 8. It featured high compression flat top pistons to deliver an added 20 horsepower (hp) and ten lb-ft of torque. Most notable are the LQ4 and LQ9 Vortec, used in the GM's 1500 and 2500HD . 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. On a 4.00" bore of an LQ4 though it is splitting hairs. The piston volume is 0cc. 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. Expect big mid to upper end power, will have a noticeable idle. The LQ9 has a flat top piston, for higher compression (10.08), but it is also higher quality. This style of the piston increases the compression ratio and horsepower of the engine. Pistons, Pro Tru Street Pistons, 4.030 in. The LQ4 is ideal for supercharging because of its 9.41:1 compression ratio and 6-liter size. . After the freshen up and some new parts, this 408 LS engine is making 742 horsepower and running strong quarter-mile times. Stay up to Date with Current Events, New Releases and Special Offers. using nitrous, a blower, or a turbo. On the Power Curve chart, see Test 2 . Description Technical Specs Engine Info This is an LQ4 based engine with LS3 Aluminum heads making a very streetable 550HP+. 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" 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. SRP. Plus new/used block ls1/6. 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). 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. SRP Small Block Chevy High Compression Forged . Some of the old LQ4's had iron heads instead of aluminum. tech@uempistons.com. '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 Jan 21, 2009. 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! but I think you stated in another thread that's what you want so. this video is about picking the right compression ratio for boost in a smaller displacement engine. Except for this component, the engines are quite similar to each other. With my last cam that was 230-238 604 604 113, 62cc heads and .40 head gaskets I had plenty of PTV clearance. Almost $2000 for just the kit. Brand. Stroke, 6.125 .927 Rod, NA/Boost/Nitrous, Cathedral/Rect. Flow numbers can be as high as 325 cfm at .600 lift. 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 $1,089.82. I can get stock LQ9 pistons for $43 ea and new LQ9 rods for $46.70 each D.S.S. Maybe it should be phrased as "reasonable compression for pump fuel with optimum timing vs. higher compression with reduced timing to stop detonation". fit . Part Number: SUM-2999274030-2. Do you think I'd have any issues. MAHLE Motorsport PowerPak and PowerPak Plus piston kits offer superior reliability and performance, letting you take your LS build to the next level. . to fit the seats. Part Number . 5.0 out of 5 stars . Now I want lq4/lq9 motor for my ss. Here's a diy video or just have a machine shop do it for you. Pin Diameter: 0.927 in. Compression Height, 0.927 in. You can use gen 4 floating pistons on gen 3 pressed piston/Rod but you can't go the other way. Compression Height - distance from CL of wrist pin to top of piston: in: Deck Height - e.g.
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