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Update This post is incredibly popular and has over 240 comments from various owners all with the same issue. Most of the issues seem to be caused by a faulty. HP 5. 3. L Gen III Small Block for 3,2. Hypothetically speaking, lets say you had the wrenching skills necessary to build a 6. Rat motor for 6,5. With the astounding airflow potential of todays conventional, 2. Chevy cylinder heads and the multitude of dirt cheap rotating assemblies cluttering up the Summit catalog, this caliber of horsepower per dollar heroism is certainly attainable try hard and you could even do it with stock rec port heads. Even though that would qualify as an impressive budget build by most standards, how many people have an extra 6,5. Since weve all had to recalibrate our affordability scale in recent years, its only prudent to pursue truly budget friendly engine combos that most hot rodders can build without running up the credit cards. While that concept is, like, so clich, were serious about turning up the wick on dollar stretching performance. How does a junkyard 5. L Gen III small block, boosted to 5. That tally includes a tuned factory computer, a wiring harness, bigger fuel injectors, and every last nut, bolt, and U bend to make it happen. If youve got another 1. LS6 camshaft, the power jumps to 5. We built it and you can, too, so lets fire up the welder and throw some sparks. The Dirtball Special. Throwing boost at a 5. L Gen III small block just makes too much sense. Secondhand OE hardware stockpiled in junkyards has always represented the pinnacle of cheap performance, and the LS series small block takes this universal truth to the extreme. Unlike in the early days of LS engine swaps, where hot rodders paid a big premium just for the cool factor, these motors are now just as cost effective to build as a Gen I small block Chevy. Aluminum variants still command a premium with plain Jane, 5. L, LS1 long blocks costing upwards of 2,0. The hot ticket in the Vortec truck engine lineup is the 6. L LQ9, which was originally installed in 34 ton trucks and SUVs. It packs an additional 1. L 3. 64 versus 3. LS6 style cylinder heads. The LQ9s 4. 0. 00 inch bores mean that its compatible with GMs L9. LS3 rectangle port head castings that flow a stunning 3. Matching them with a mild hydraulic roller cam nets an easy 5. MSD ignition controller, and headers. If the 6. 0. L is so great, then the obvious question is, why even bother building a 5. L in the first place The biggest downside to the 6. L truck motor is scarcity, and some early ones had piston slap issues. GM built way more 12 ton trucks and SUVs with 5. L engines than it did 34 ton models with the 6. L. Consequently, junkyard 5. L motors can be had for 2. For a naturally aspirated engine build, the 6. L is a more appealing option due to its additional displacement and superior cylinder heads. On the other hand, what if you took the money saved by buying a 5. L motor and put it toward a DIY turbo system To make things more interesting and further drive down costs, lets hang one of those Chinese e. Bay turbos off of the factory exhaust manifolds and see if it holds. On paper, a stock 5. L small block boosted to 7 to 1. L build in terms of horsepower per dollar. To put this bold theory to the test, we purchased a complete 5. L LM7 engine plucked out of an 0. GMC Yukon complete with a matching computer and wiring harness for 4. Houston junkyard. If you cant find a 5. L motor locally, there are tons of similar deals on e. Bay if youre willing to dish out a couple hundred dollars for shipping. At this price point, expect a motor with lots of miles our tester had 1. Even so, many of the junkyards we ran across offered some type of guarantee that their engines were in good working condition. To pressurize our test subject, we put in a lowball bid on e. Bay for a 7. 6mm turbo and won it for 4. The rest of our cobbled up DIY turbo system included a Turbosmart wastegate, blow off valve, and manual boost controller. Exonuclease Activity Of Taq Dna Polymerase Reaction there. To control the fuel and spark, we matched up a stock computer with HPTuners tuning software, Ford SVO 4. GM 2. 5 bar MAP sensor off of a new Chevy Cobalt SS. The U bends, flanges, and V band clamps required to build the turbo piping were all supplied by Fastlane Inc. Houston, which also stepped up to fabricate everything for us. Fastlane specializes in building custom turbo systems for LS, Hemi, and mod motor powered late models, and was kind enough to rig us up a kit in no time. As youll notice, the labor to fabricate the plumbing from the tubing we provided was not included in the total price. Anyone with a MIG welder should be able to build this setup, but if not, factor in several hundred dollars for the fab work. From there, we hauled the motor down the street to the good folks at the School of Automotive Machinists for a merciless dyno thrash. Boost. With the 5. SAMs Super. Flow 9. For the baseline pulls, we set the wastegate at 8 psi of boost and dialed in a conservative 1. The wee 3. 25ci mill responded with a respectable 5. For the next round of testing, we increased the boost to 1. Suspecting that the stock 1. LS6 units. The simple fix did the trick, and horsepower and torque increased to 5. On an engine with that many miles, its possible that the boost pressure was preventing the worn out valvesprings from closing the valves all the way, explained Judson Massingill of SAM. With a junkyard build like this, its probably a good idea to replace the valvesprings no matter what. Considering that the stock 5. L motor is choked by a minuscule 1. Curious to see what dividends some extra duration and lift would yield, we installed a stock GM LS6 camshaft. The cam was PN 1. LS unit. Theres much confusion online over the LS6 cam specs, so we had SAM get the real numbers on a Cam Doctor 2. LSA. The LS6 cams wide lobe separation angle bolsters its boost friendly credentials. Even so, we were shocked when output jumped to 5. Conventional wisdom says that stock camshafts work well in forced induction applications, but when the cam in question is as small as the stock 5. L LM7s, conventional wisdom apparently doesnt apply. Breaking Down the Numbers. In retrospect, our DIY turbo 5. L motor built on a working mans budget far exceeded every expectation. As much as wed like to take credit for it, LS enthusiasts have been building similar budget turbo combos long before we took a crack at it. To our surprise, the factory long block survived 2. Chinese turbo didnt self destruct, and it came within six numbers of cracking the 6. Even at 5. 94 hp, the Dirtball Special produced more than twice the output of a stock 2. L LM7. That said, theres definitely more left in this package considering that the motor picked up just 1. To keep costs to a bare minimum, we passed on rigging up an intercooler, but our dyno figures clearly indicate that this decision sacrificed power during our high boost pulls. With an intercooler or methanol injection, this engine would easily make 6. SAM Head Instructor Chris Bennett opined. Big time power gains aside, the pressing question for anyone contemplating a similar buildup is how long a turbocharged, stock, 5. L engine will last. Based on our dyno results, its a good idea to limit boost to 7 to 8 psi on pump gas in nonintercooled applications. Without a means of cooling the inlet air temperature, anything beyond that point yields negligible power gains while increasing the potential for detonation. Furthermore, infinite variations in fuel quality and a hot rodders engine tuning skills make it very difficult to put an exact figure on short block longevity. A whole lot of stupidity can blow up a motor in not a lot of time, whereas some enthusiasts have reported tens of thousands of miles of reliable operation from their forced induction LS motors. The great thing about the 5. L small block is that if you do indeed blow it up, a mere 2. At the outset of this engine build, we wanted to find out if a junkyard 5. L Gen III motor with a giant DIY turbo hanging off the stock exhaust manifolds could really make more power than a naturally aspirated 6. L for less money.