ls7 compression test spec|corvette ls7 engine problems : suppliers Details on the GM 7.0L V8 LS7 engine used in the Corvette Z06, 427 Convertible, Camaro Z/28. Detailed info and specifications, vehicle applications, and more.
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Quick Navigation GM V8 Tuning - Engine, Gas (Gen 4) Top. Still getting more oil in the catch can than I feel should be in there, so, I decided to compression test the engine. Swap vehicle with Ls7 NA with cam, long tubes, MSD Intake. Performed the test on a cold engine.
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The maximum effective compression ratio of a stock LS7 (11:1 compression ratio) with 4 PSI of boost would be an effective compression ratio of 14:1. If you added a cam . Then you need to find out the factory compression specs for your paticular motor, optimal (standard) and the minimum allowed before rebuild. Lastly your motor needs to be at .
Baseline Test LM7 (5.3L) Camshaft Specs and Dyno Results. Lift 0.466/0.457. Duration 190/191 degrees. LSA 116 degrees. Idle vacuum 22.5 in-Hg. Cranking compression .The LS7's high compression ratio meant that it could produce 465 horsepower at 5,200 rpm and 490 foot-pounds of torque at 5,200 rpm. Torque refers to the amount of work an engine can .Details on the GM 7.0L V8 LS7 engine used in the Corvette Z06, 427 Convertible, Camaro Z/28. Detailed info and specifications, vehicle applications, and more.
We put everything you need to know about the Gen. III & Gen. IV LS engine family in 1 spot—from cam specs to upgrades & everything in between.
Chevrolet Corvette Stingray 454 LS7 specs. Car type: Coupe: Curb weight: 1531 kg (3375 lbs) Dimensions: 4.64 m (183 in) long, 1.75 m (69 in) wide, 1.21 m (48 in) high . My reasoning is that the 1971 LS6 (slightly lower compression than . Equipped with 1.7 rockers, the LS7 cam increased peak power from 353 hp and 384 lb-ft to 422 hp and 395 lb-ft. Up to 4,500 rpm, the LM7 offered more power, but the LS7 pulled strong all the way to .
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LS7 Specs Index. Horsepower: 505 hp . Compression Ratio: 11.0:1; Displacement: 427 cubic-inches (7.0 L) Cylinder Bore: 4.13 inches (104.8 mm) Stroke: 4.0 inches (101.6mm) Additional LS7 Uses. Outside of its use in .
Here are the recommended engine oil specifications for the Chevy LS7 engine: – Oil Type: The LS7 engine requires synthetic engine oil with a viscosity rating of 5W-30. It is important to use high-quality oil that meets the GM Dexos 2 specification. . Compression Ratio: 11.0:1: Fuel System: Sequential Fuel Injection: Valvetrain: Overhead .
Obviously, this system is much more complex than a standard wet sump and requires multiple external plumbing and fittings. To accommodate the two-stage LS7 pump, the LS7 crankshaft snout is longer than normal. Because of the crank snout and other components, the LS7’s dry sump cannot be easily added to factory LS wet sump engines. The 427 c.i.d. LS7 is the largest displacement engine in the LS family. It was the most powerful naturally-aspirated GM production V8 engine since the 1960s and was based on the C5-R Le Mans Corvette racing engine. . [Every engine spec you’ll need can be found here: LS7 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs .
All things considered, the LS7-equipped C6 Convertible boasted a top speed of 198 MPH and was capable of completing a ¼ mile pull in 11.8 seconds. The C6 Convertible also recorded 0-60 MPH times of just under four seconds. LS7 Specs Index. Horsepower: 505 hp @ 6,300 rpm; Torque: 470 lb.-ft @ 4,800 rpm; Compression Ratio: 11.0:1; Displacement . The valve guide problem does not affect all LS7 cylinder heads. The Corvette Action Center web site has a good article by Hib Halverson on how to properly perform the GM-specified field test for valve guide wear. Dubbed the “wiggle test” by the DIY Corvette community, the procedure measures the valve-stem-to-guide clearance.
The heads retain the factory LS7 intake and exhaust valves but have upgraded LPE Eliminator series valvesprings. An Eliminator series XPR-1 camshaft with confidential specs works with the custom Trend Performance pushrods and COMP Cams rockers. “We developed the cam profile for a broad power curve which comes on very early and holds strongly . I've been farting around looking at the most popular LS7 cams and comparing them to what I've been spec'n for my motor: forged 427 with milled stock LS7 heads, that are getting just a touch of chamber work. Here's what I've gathered about the QM600 & Katech's Torquer: QM600 Specs:113+X 23X/25X 6XX/6XX (14-24.5 overlap @ .050”) The LM7 is a 5.3L, Gen. 3 small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 5300.
Using the 70cc chambers offered by both the LS3 and LS7 heads, the 468 featured a static compression ratio of 12.25:1. Comp Cams supplied a suitable hydraulic roller cam for our high-compression . High-Compression 427 LS Makes Serious Power on the Dyno. More displacement and an extra helping of cylinder pressure help this iron-block LSX make 661 hp and 585 lb-ft. In preparation for our intake test, the LS7 was first equipped with Kook’s long-tube headers, a FAST XFI/XIM management system and filled with Lucas 5W-30 synthetic oil. Other fancy bits on the test motor included an ATI Super Damper, Meziere electric water pump, and FAST 102-mm throttle body.
Indeed, the tests we conductedwith an as-delivered GMPP LS7 crate engine on a Super Flow 901 dyno atThompson Racing Engines in Redford, Michigan, generated 546 hp at 6,100rpm and 514 lb-ft of . 7.0L LS Engine Specs. Check out some basic specs on the LS7 below, then click on the name “LS7” hyperlinked within the chart to see other vital engine data like general performance, bore & stroke, cylinder head design, .The General Motors LS-based small-block engines are a family of V8 and offshoot V6 engines designed and manufactured by American automotive company General Motors.First introduced in 1997, the family is a continuation .
C6 Corvette ZR1 & Z06 - Compression for the LS7: the next great mod? - Seeing a lot of sizeable gains from the likes of Carlos and Jim Hall here on the forum and am considering increasing the compression on my LS7 when I have the bottom end forged. . If I were you I'd spec out the cam and then mill the heads to achieve a Dynamic compression .
I had a 4-cylinder engine that was running rough at idle. It ran strong (relatively, of course) at cruising RPMs and WOT at high RPMs, but it idled like crap and failed an e-test. I had a compression test done and three of four cylinders were fine (180-195 PSI), one was very, very low (110-ish PSI).
The maximum effective compression ratio of a stock LS7 (11:1 compression ratio) with 4 PSI of boost would be an effective compression ratio of 14:1. If you added a cam designed for boost with valve overlap, the stock LS7 would be able to support roughly 6 PSI and net an effective compression ratio of 15.5:1. The pistons are forgings from DSS Racing. They are sized at 4.125 inches in diameter with a 1.165 compression height. The dish is worth 29 cc and should help keep compression in a manageable range because we’ll be running this engine on 93-octane pump gas. They connect to a set of Eagle H-beam connecting rods with a 0.927 pin.
Test Number 2- Z06 with Camshaft, Power Pack and Tuning, Test parameters: Inlet Air temperature 89.5° Fahrenheit, barometric pressure 30.08, Humidity 26%, correction factor .99 Engine CompressionAtmospheric pressure at sea level is approximately 14.7 psi.A 9:1 compression ratio cylinder is compressing the air and fuel mixture to about 132 psi at sea level (9x14.7=132.3 . By cutting the stroke and retaining the LS7’s 4.125-inch bores, it becomes an oversquare engine, with a 1.14:1 bore/stroke ratio (the stock LS7 is essentially square, with a 1.03:1 ratio) and an .
The 2025 Zr1’s new twin-turbo, 5.5L flat-plane-crank LT7 engine makes more power than two LS7 engines. Top speed is over 215 mph. Today, GM took the covers off the most powerful and fastest Corvette of all time, the 2025 ZR1.We’ll have a lot more coverage to offer over the next few days. We examined the LS7 cylinder head at the GMTech Center in Southern California, and were stunned by the execution.On paper, the specifications alone were impressive: 2.200-inch intakevalves, 1.61 . He installed the LS7 in the car in the late 1980's and the number stamped on the block is TL02XCH09488093. . and forged 12.25 compression pistons. The cam is a flat tappet solid lifter 560 .
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ls7 compression test spec|corvette ls7 engine problems