In the human being of small-block Chevys, there space literally hundreds of engines to select from. The choices range from cheapie backyard rebuilds come $10,000-plus gyeongju motors. Among all of these engines clamoring for her attention, over there is one that may be the deal of the century. For years, Chevrolet has readily available the Goodwrench 350 together a brand brand-new service replacement engine. If you have the right to purchase this engine from any GM dealer in the country, there are a few dealers favor Scoggin-Dickey that are supplying Mr. Goodwrench because that the superior price the $1,190! This isnt part slapped-together rebuild, its an all brand-new 350 long-block assembled with new parts. And much better still, it comes v a warranty.
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If youre in search of a simple small-block the will supply years the trouble-free operation, youll be hard-pressed to uncover a far better buy. But because this magazine is called Chevy High Performance, we thought it would be fun to see what sort of voodoo we can do to extract much more grunt from our Goodwrench Mouse. The setup was simple: borrow a Goodwrench 350 engine native Scoggin-Dickey, bolt that on the dyno, and run the wee out of it.
This an initial of numerous episodes began with a test of the basic engine package with a factory Q-jet intake, cast-iron exhaust manifolds, HEI ignition, and a complete dual-exhaust system. The next test included a set of Hooker headers and finished with the addition of an Edelbrock demonstrate intake. Every the exam were operation on 92-octane pump gas.
The Goodwrench 350 is unquestionably bread-and-butter basic. While all production small-blocks have employed a one-piece rear-main seal design since 1986, the Goodwrench 350 is assembled in Mexico and retains the classic two-piece pre-86 design. This provides it terrific choice because that a basic hot rod motor for all pre-86 cars because you dont need to purchase a new flexplate or flywheel.
Starting through a four-bolt key cap block, the 350 employs a standard cast crank and also cast-aluminum flat-top pistons with ductile-iron 5/64-inch rings. Chevy cases the compression is a wheezy 8.1:1, yet after the test to be over, us measured everything and also came up through a slightly much better 8.4:1. The an excellent news with this short compression is that the Goodwrench engine should also run top top 87-octane gas. The downside is that this low compression definitely sacrifices power. The long-block comes complete with an oil pump and also pan, and a timing-chain cover and also valve covers. The video camer is a straightforward flat-tappet hydraulic with specs that room bone-stock tame. The 76cc room cast-iron top (casting number 83417368) room fitted with 1.94/1.50-inch intake and also exhaust valves and also stock stamped-steel rockers.
Beyond the mechanical aspects, theres likewise the GM warranty. According to Scoggin-Dickey, GM uses a three-year, 50,000-mile warranty on the engine as lengthy as it has not it is in internally altered; this way that the warranty would certainly be void if a power camshaft was added or if the compression was increased. However, a power intake manifold and/or headers room acceptable modifications. Over there are various other warranty details too countless to cite here, i m sorry you should investigate if you space considering purchasing one of these engines.
With shipping expenses ranging native $125 come $165, depending on how much the engine should travel, you might have a Goodwrench 350 at her doorstep because that $1,355 or less. One other important allude is that Scoggin-Dickey buyers exterior the state that Texas perform not need to pay sales tax, which deserve to represent a save in overfill of $100.
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Freelancer, engine builder, and CHPs man-about-town, Ed Taylor, ram-rodded the Goodwrench computer mouse project for united state at Ken Duttweiler performance in Saticoy, California. The first test to be to cork the 350 through a stock aluminum input manifold, a Q-jet carburetor, and also cast-iron exhaust manifolds connected to a pair the Hooker 2-¼-inch turbo-style mufflers. As you can see from the test 1 results, the engine carry out much much better than GMs share 190hp rating, making 239 hp at 4,300 with peak torque comes in at 3,700 rpm through 324 lb-ft. This is a fairly narrow powerband in between peak torque and also peak horsepower, and also it was evident that both the intake and exhaust systems were exceptionally restrictive. Remember, this is a stone-stock 350 through kerosene-compatible compression and also a camshaft the barely bumps the valves off your seats. ~ above the add to side, the engine made more than 250 lb-ft the torque native 2,500 to 4,800.
It was noticeable the engine necessary to breathe, so us pitched the cast-iron exhaust manifolds and bolted top top a collection of Hooker 1-5/8-inch headers. We kept the 2-¼-inch exhaust pipes and Hooker turbo mufflers, all acquired from PAW. The engine responded immediately to the exhaust system upgrade through as much as 53 lb-ft more torque at 3,400 rpm! To placed that in perspective, thats favor a mild shoot of nitrous. Together you could expect, horsepower likewise improved, through 17 an ext horsepower in ~ 4,500 rpm. Us were absolutely on the ideal track, however now the engine needed help with the induction side.
The route to adding much more horsepower to be obviousthe Goodwrench motor required a much better intake manifold. So, us unbolted the manufacturing facility aluminum piece and bolted on an Edelbrock performer intake. The performer is drilled because that both the square-flange Holley-style bolt pattern and also the spread-bore Q-jet pattern, which renders installation easy. Within a few minutes, Taylor fired the engine back up and also ran it through the 2,500- to 5,300-rpm strength test. Looking at the strength curves, the Performer shed a little power listed below 3,000 rpm, but an ext than consisted of for the with improved power in the mid-range. This is more than likely not a trouble with the manifold as lot as it shows a calibration challenge with the Q-jet that might have been solved with a bit an ext tuning. Yet overall, the combination of the Goodwrench 350, a set of 1-5/8 headers, one Edelbrock show intake, and a painfully stock Q-jet to be worth 350 lb-ft of torque and 265 hp. Not bad for a stock motor and bolt-on parts!
Where execute We go From Here?
Were done because that this installment, but hang on since were not practically done beating ~ above this small Chevy. The Scoggin-Dickey Goodwrench 350 will certainly return in the next story, once we will certainly pocket-port the stock heads and also then try a better camshaft. Under the road, weve additionally got a set of aluminum Corvette heads and a collection of Vortec manufacturing iron top were going come swap right into place and other parts combinations, enlarge cams, various carburetors, and also even some variations on the header theme. The Vortec heads and also other GM hi-po parts come indigenous GM power Parts, which can additionally be derived directly indigenous Scoggin-Dickey. Therefore stick with uswe plan on beating the snot the end of this Goodwrench crate engine to discover out just exactly how much strength we deserve to squeeze the end of a spending plan small-block.
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