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Ls1 5.7 flycut11/14/2023 However, if you tighten it so that it stretches again, it will lose almost all its tensile strength, and it’s only a matter of time before it snaps. That means once the bolt has been stretched, it cannot be reused because if you tighten it to the same spec again, it won’t be tight enough because it’s already stretched. Torque to yield means the bolt is designed to stretch to a certain length as it’s tightened to the required torque spec. The “22 lb-ft + 40°” bolt pattern may not make a lot of sense initially, but once we understand what torque to yield (TTY) means, it will be clear as day. LS Engine “22 lb-ft + 40° (TTY)” Flywheel Bolt Torque Pattern Explained Now, some people argue against this, but in the case of this pattern that doesn’t have TTY (torque to yield) bolts, we would say that GM’s recommendation makes more sense. In other words, that means the first couple of bolts you tightened will become loose and not to spec by the time you tighten the rest of them.Īlso, for all LS engines with the “15>37>74” bolt pattern, GM recommends putting just a smear of blue thread locker on each bolt. If you fail to do this, the flywheel metal will be more compressed under the last couple of bolts you tightened. In other words, you need to do all three passes to prevent the flywheel metal from compressing under the bolts unequally. The reason this is important is to tighten the flywheel as evenly as possible all around. The LS 5.3 flywheel torque specs are the same. The reason there are three different specs is that you first have to tighten all the bolts to 15 lb-ft (first pass), then again to 37 lb-ft (second pass), and finally 74 lb-ft (third pass). With the bolt pattern in question, each of the numbers represents a torque spec, so that’s 15 lb-ft, 37 lb-ft, and 74 lb-ft. LS Engine “15 > 37 > 74 lb-ft” Flywheel Bolt Torque Pattern Explained Also, before you jump into the LS torque specs below and beginning looking for your car or engine, pay attention to the following instructions. But keep driving for a while, and all the extra vibrations can destroy the rod bearings and transmission bearings, so it’s not worth the risk. If the LS flywheel bolt torque is incorrect, they are more likely than not to back out and fly into the clutch assembly and end up destroying it. Then, considering that some LS engines have a displacement of up to 7.0 liters, it’s easy to see how flywheel vibrations can be a problem. All LS engines have a cross-plane crankshaft which, by design, creates a lot of vibrations and powerful pulses going through the crankshaft. In most versions of the fourth generation LS, the first pass is 22 lb-ft after that, you turn the wrench another 40°, and that’s it.Īll car engines have flywheel torque specs, but rarely are they ever as important as they are in LS engines. In the third-generation LS and some fourth-generation ones, the first pass is 15 lb-ft, the second pass is 35 lb-ft, and the third and final torque spec is 74 lb-ft. The LS flywheel bolt torque specs are separated into a couple of stages. So, here is what the torque specs are in an LS engine. But even more crucially, the flywheel lowers the crankshaft and piston vibration, which is why it’s critical to torque it down properly to prevent the bolts from backing out, thus destroying both the engine and the transmission. Please contact us at for a shipping quote.We can look at the flywheel as a giant rotating weight that absorbs the engine vibrations, preventing them from being transferred into the cabin. NOTE: Due to the size/weight of this item, there will be additional shipping charges for orders outside of the continental United States. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. (Warning) This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. These headers already have a V-band collectors to make it simple when fabricating the hotside of your turbo setup. We stand behind our headers in saying you will not find a better fitting, quality built, budget header for your vehicle. Our headers are mandrel bent, tig welded, and feature polished stainless-steel construction. These Speed Engineering headers are made out of 304 stainless steel and offer great quality, performance, and affordability. This item drop ships from the manufacturer
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