You can check this with a feeler gauge or welding rod of the appropriate thickness. You’ll probably pay a shop $3-400 or more. Even with a stock engine, you can gain 40+ horsepower with a simple,safe tune(no joke, just by changing GM’s ridiculous power enrichment settings). Either way is fine, but I would like to know. by ghe way, im adding headers,x pipe exaust, electric fans, cold air induction id hoped a cam kit with all that eould get me to roughly 400 hp at thd flywheel….. There is a lot of power there along with trans shift points and turning off torque limiting etc. tighter tolerances DO reduce oil clearance in the crank and bearing journal gaps and other related areas, so when you use a nice low viscosity oil it reduces the engine pressure and increases horsepower (a bit) due to the reduced load on the oil pump. Writer Bio This article was written by a professional writer, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Thanks for this very detailed information. 0L (LQ4, LQ9) 6- 2 Engine Mechanical - 6. Crankshaft Main Bearing Clearance – Production 0.02–0.052 mm 0.0008–0.0021 in Crankshaft Main Bearing Clearance – Service 0.02–0.065 mm 0.0008–0.0025 in Crankshaft Main Journal Diameter – Production 64.993–65.007 mm 2.558–2.559 in Crankshaft Main Journal Diameter – … The minimum acceptable clearance is 0.060 – 0.080-inch between all moving parts and the block. Connecting Rod Bearing Clearance (Production) 0.023-0.065 mm. This video demonstrates the proper use of plastiguage for determining main bearing clearance. Everything you ever wanted to know about the LQ4/LQ9 engines! For clearances smaller and larger than the rule of thumb ,refer to the factors listed below: Factors for tighter oil clearances: Smaller journals; Lower viscosity oils; Surface finishes min 4 RA (Image/Super Chevy). As part of the interview for this story, Lieb also opened a discussion about rod-bolt torque. LS Engine Specifications. those would bump compression a bit too. This guide is specifically for the GM LQ4 engine. Reducing the oil clearance between the rod and main bearings and the crankshaft has a number of advantages. Bore), Piston Compression Ring End Gap (Service--2nd) (Measured in Cylinder The reason for the cam is ls3 heads are very high flow, therefore a heavier-durable cam is needed. (Summit Racing’s Brian Nutter and Paul Spurlock contributed to this article.). Or, for the same price, you can buy the HP Tuners MPVI2, and the credits to tune your truck. 0.00433-0.02 in. My truck has the .411 rear end too so I am also looking for ways to increase hp and torque for easier pulling. Some simple clearance mill work solved that issue. This will typically be in the range of .0005.”. The reason for using a mirror is to make certain the clearance doesn’t close where you can’t easily see it or measure it. I’m planning on building up my pickups stock LQ4. And ls3 heads? Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM family tree: Chevy, Pontiac, GMC, Cadillac, Buick—heck, even Saab, Hummer, and Isuzu got some LS love. Debating on whether to put it in a 69 Corvette, or a 476 Big Block. This site uses Akismet to reduce spam. When shopping, it's important to do your homework. It is a bored version of the Vortec 5300. The engine specs and information listed here is for the stock LQ4 engine. Before beginning final assembly, you should have all of the applicable tools listed in Chapter 2 in hand and ready to use—read through this chapter first to see which ones you will need if you’re unsure. The information you get is invaluable an will make it run just like the factory. This is my first LS build and I grew up with the first and second gen small blocks. Pingback: LS Engines 101: An Introductory Overview of the Gen III/IV LS Engine Family - OnAllCylinders. Monte Makeover (Part 6): Summit Racing Pro LS Cam Install, Exhaust Upgrade...and Dyno Test! Then u gotta change intake….. this guy givin bad advice piss off noob. There’s even a specific tow/RV cam meant to maximize torque in the 2500-3500 range called the SUM-8718. Connecting Rod Side Clearance ; 0.11-0.51 mm. Measure the vertical clearance. Crankshaft Rod Journal: 2.100 in. 0.0009-0.0025 in. If anyone can tell me for sure, I would be very grateful. On the other hand, stock rebuilds … 0.0008-0.0021 in. Curious if the stock LS3 cam would be a good cheap upgrade for pulling, and overall performance. 0.005 mm (Maximum for one half of the Journal Length), 0.0002 in (Maximum for one half of the Journal Length), Camshaft Runout (Measured at the Intermediate Journals), Connecting Rod Bearing Clearance (Production), Connecting Rod Bearing Clearance (Service Limit), Crankshaft Bearing Clearance (Production), Crankshaft Connecting Rod Journal Diameter (Production), Crankshaft Connecting Rod Journal Diameter (Service Limit), Crankshaft Connecting Rod Journal Taper (Production), Crankshaft Connecting Rod Journal Taper (Service Limit), Crankshaft Connecting Rod Journal Out-of-Round (Production), Crankshaft Connecting Rod Journal Out-of-Round (Service Limit), Crankshaft Main Journal Diameter (Production), Crankshaft Main Journal Diameter (Service Limit), Crankshaft Main Journal Out-of-Round (Production), Crankshaft Main Journal Out of Round (Service Limit), Crankshaft Main Journal Taper (Production), Crankshaft Main Journal Taper (Service Limit), Crankshaft Reluctor Ring Runout (Measured 1.0 mm (0.04 in) Your email address will not be published. Anymore questions feel free to ask. Arent they rectangular port? Stroke: 3.622 in. Centerline of Crankshaft to the Head Deck), Intake Manifold Cylinder Head Deck Flatness (Measured within a Tick Street Heat Stg 2 229/244 | .618”/.610” | LSA112+4. Crankshaft Main Journal: 2.559 in. Visit us at the Booth #3764, from January 9-12, 2020. I would be interested in more details to what you are doing to your engine to gain that extra umph to pull your rig. At the heart of your powerplant is … Henry De Los Santos Jun 22, 2007. I am,curious if the 6.0 has gen 3 or gen 4 rods? Save my name, email, and website in this browser for the next time I comment. Very helpful looking forward to turning my lq4 into a race motor for my 67 nova thanks. There are two … Crankshaft Bearing Cap Bolts (Inner Bolts-Final Pass in Sequence) 80 degrees Crankshaft Bearing Cap Side Bolts 25 N•m 18 lb ft Crankshaft Bearing Cap Bolts … I would like to spend as little as possible but I am willing to do all if needed. Thanks -Brad. Worn Off, Piston Pin Clearance to Piston Bore (Production), Piston Pin Clearance to Piston Bore (Service Limit), Piston Compression Ring End Gap (Production--Top) (Measured in Another choice is the Trick Flow As Cast 220’s. Crankshaft Bearing Clearance (Production) 0.020-0.052 mm. Ran it for 2 years in my 98 Silverado before pulling it to scrap the truck. You’re welcome, Rusty. The information you provide is invaluable to me. OP PONTIAC SLEEPER, theturboforums.com 6000 Vortec 6.0L LQ4 The Vortec 6000, or LQ4, is a V8 truck engine. Cam, Ls3 heads. Pingback: LQ4/LQ9 Engine Upgrade Guide: Expert Advice for LQ4 & LQ9 Mods to Maximize Performance - OnAllCylinders, Pingback: Mailbag: Mating an Older GM Automatic Transmission to an LS Engine, I’m currently looking into buying a 6.0 for my project 03 Chevy Silverado Single cab that I want to get some speed and power out of and I was wondering if I should buy a 6.0 or get a 5.7 or 5.3, Jerry I have 1969 Chevy truck that is modified I purchase and I not sure what 6L motor and hp is has , I was told a 2005 3/4 Chevy truck I got a F103 number on the front block pass side and pass head alum. The LQ4 is a 6.0L Gen. 3 small block engine used in GM trucks from 1999-2007. My LQ4 is an 01 from a Yukon Denali and it is a Drive by Wire. All Ford engines and the new generation LS small-block place the thrust bearing in the center main cap, which may be an advantage under high load conditions to stabilize the crankshaft. They’ve been known to handle over 1000 whp. Rocker Arm Cover Seal Surface), Cylinder Head Intake Manifold Deck Flatness, Engine Block Cylinder Head Deck Surface Flatness (Measured within a Typical bearing oil clearance is 0.001 to 0.0015, and that's not very much space. Casting Numbers: 12551364, 12573581, 12577184. Will the stock ECM be just fine with all the upgrades or will I need to tune or replace it with one that will? Do u even know what ur talking about? By the Numbers 409ci LQ4 Iron-Block LS We like to set the clearance between .0018 and .0020 inch. King will showcase the most recent and up-to-date innovation in engine bearing technology and racing […]