Your information will be collected and used in accordance with our  Privacy Policy. This likely led to more boost bleed-off out the exhaust, so low-rpm power dropped. To duplicate that power on pump gas without a blower, you'd typically have to build a 540ci Rat motor, and it wouldn't be as driveable or have nearly as stout of a torque curve. 586 Horsepower, 1957 Chrysler Block Bored .030 to 398 Cubic Inch, Keith Black Blower Pistons, H-Beam Steel Rods, Double Keyed Steel Crank and Balancer, Complete Rotating Assembly Balanced, Polished Aluminum Valve I made 5 LBS of boost and 30 degrees timing. This reduced boost to 6.4 pounds at 5,900 rpm, and power dropped to 706 lb-ft at 4,700 and 737 hp at 5,900. What really moves the car though is torque.A stock 454 with a roots blower will have a very flat torque curve in excess of 500 ft/lbs or more.A real tire fryer for the street. Boost is a measure of restriction, so reducing that restriction often increases power and decreases indicated boost (we found exactly that with the header and rocker-arm tests seen in the chart). Finally, the blower kit is designed to work with a short-water pump. The car is making 850+ horsepower, nd is capable of a lot more! Your information will be collected and used in accordance with our  Privacy Policy. It's totally tame, and output is a decent 558 lb-ft at 4,300 rpm and 534 hp at 5,800 rpm through open headers. The short-block is an '84 LS6 with some LS7 parts, which means that it's fitted with a GM 5140 steel crank, L88 rods with 7/16-inch rod bolts, SRP pistons, and a high-volume oiling system. It had cast iron LS-7 heads. We ditched our mechanical long water pump in favor of a CSR Performance (formerly CSI) electric unit, PN 900R ($269.88). 454 Chevy Big Block V8 Superchargers in … The Roots Blower Proves Itself Again As The Ultimate Bolt-On For Street Or Strip On Our ZZ454 Test Mule. Can you ever have too much of a good thing? Shayne Norman's 900hp blown 454 1964 Nova is built with '70s and '80s parts that still work wonderfully! Even with the wider lobe displacement angle on the solid, the total window of valve overlap is bigger on the solid. So, when we ran thin on external bolt-ons for our Every Trick in the Book 454 test mule, we couldn't help but notice that our trusty Weiand 8-71 was collecting dust on the shop shelf. For street engines on 93 octane pump gas, a common figure is 1.5hp/CID. The bottom end of Shayne's big-block reads like an '80s PAW catalog. Goofing off with the huffer proved more interesting than we thought. I have had a few people say running a 671 on a BBC will create heat problems. Stock about 60 hp, with a pipe power reeds etc you can make over 70hp depends on what you are ready to put into your bike. ft. @ 3200 RPM (PFI) 1987-2001 1-piece seal 4-bolt main The cam was a flat tappet with 255/256 @.050 621/579 To get this cam for a Gen VI big-block, order PN 01-000-8 with grind number CBV1 4853B/4853BSR112. Shop 454 Chevy Big Block V8 Superchargers and get Free Shipping on orders over $99 at Speedway Motors, the Racing and Rodding Specialists. We also used a pair of Holley 950 HP supercharger carburetors PN 0-80577 ($809.95 each), a Weiand PN 7166 linkage kit ($141.50), and a PN 7093 stainless fuel-line kit ($279.95). The steering box is from a Vega, and the wheels are from the '60s or'70s. Surprisingly, the 454 laid down an impressive 330 horsepower and 475 pound-feet of torque. See a complete story on this in the Aug. '03 HOT ROD, or see it at Hotrod.com now. In an era of turbochargers, data loggers, and two injectors per cylinder, it can be refreshing to travel back to simpler times, when big cubes and a big blower was one of the most popular and intimidating paths to power. Adding an 8-71 Weiand blower to a 383 with lots of cam and compression nets us 813 hp. sixty degree that can be hard anodized for a long lasting durable supercharger with tighter inside tolerances creating a more efficient supercharger. We had a custom 260/268-at-0.050 cam sitting around; Westech's Steve Brul stabbed it in for us and found zero valve-to-piston clearance. In the case of this cam, the specs look only slightly bigger, but the ramp rates of the solid roller are much more aggressive than the hydraulic's. Shayne's car was built for one reason: to have fun. “Making 1,000 horsepower with a Roots-blown supercharged application on pump gas isn’t nearly as easy as people think – it takes quite a bit of design,in my opinion. It seems today that blown big-blocks are purely a car-show affair, which is why we were surprised to see Shayne Norman out making some seriously fast laps at the Kingdon Airport drags in Lodi, California. So far, our best power is from a combo of an Edelbrock Performer RPM Air Gap intake, a JET-tuned 850 Holley carb, PN 2217-1 Hooker Super Competition 2-inch headers, 18-inch collector extensions, Comp Cams 1.7:1 roller rockers, and a Comp ZR282HR hydraulic-roller cam (a specs chart is on page 114). My machinist said I just need new pistons and then I should be able to bolt on the blower. Short-Block A set of '71 square-port cylinder heads top the LS6 and are secured by FelPro head gaskets. Most of these guys that talk about 1,000 horsepower with a Roots supercharger aren’t … The power increase was only above 5,900 rpm, since letting the engine rev allowed it to make more boost: 7.9 pounds at 7,000 rpm. The standard blower is a BDS 14-71, which supports over 2,000 horsepower and offers a starting price point of around $45,000. Check the fuse and blower relay first. chevy 454 with 871 blower 2nd start up eagle al's 57 871 blower - Duration: 6:27. Blower!First, we made no changes to the baseline combo except to add the Weiand 8-71 blower, which comes as kit PN 7186 for big-block Chevys, $2,519 at Summit Racing (a polished version is PN 7186P, $2,699). By clicking Sign Up, you agree to the  Terms of Use. We'll learn that and more in coming months. In the end, we selected a 1999 Gen VI 454 and pulled it from its home in the engine bay of a 1-ton work truck. Our first whack with the 8-71 used a 63-tooth pulley on the top and a 54 on the bottom for a drive ratio of 0.857:1 (14.3 percent underdriven) making peak boost of 7.6 pounds at 5,900 rpm and delivering 724 lb-ft at 4,800 rpm and 754 hp at 5,900 rpm. Red Anodized blower studs for 471 (billet aluminum with nuts and washers) Set $ 35.00 Blower Base gaskets 4-71, 6-71, 8-71 Packs of 2 $28.00 Carb adapter screen gaskets 4-71, 6-71, 8-71 Packs of 2 $25.00 6v71 Blower Base i guess what your asking is what hp increase could you see by adding a 6-71 to a stock 454.It is not uncommon to see a 40% increase in hp with that size roots blower.For example..300 hp x 40%=420 hp. The company used that information to computer-model a custom cam that would fit. Blast from the Past! Big-Block Chevy Blower - 8-71! Rotors are billet alum. Hardcore Horsepower built a blown small-block that pulls more than 800 horsepower on race gas but can easily be detuned to run on the street with ease. Chevy 454 big block - the only way to power a snowblower Feb 25, 2010, 2:29pm ET Just in case you're havin' any trouble removing snow from your driveway...this baby will blow snow back to … Heads How much horsepower will I get with a Dyer's Blower Kit? 8-71 Blower Shop Big Block Chevy Complete Blower Setup - $5,295 Call Alkydigger.net 615-457-3192 Listed By Alky Digger Fuel Injection , Superchargers They're low-tech, outdated, and require a big hole in the hood that some feel is just passe. Valvesprings are 140-pound units from Crane, and the rockers are 1.7:1 ratio pieces from Lunati. The manifold-to-head-port mismatch is hideous, but it works. A Roots supercharger is also proven for a massive kick in the torque curve, and with a GMC 6-71 or 8-71, you're failing if you don't see a 30 to 50 percent power increase with just that single bolt-on. © 2020 Hot Rod | MOTOR TREND GROUP, LLC. © 2020 Hot Rod | MOTOR TREND GROUP, LLC. Click here for more details or check out the December 2012 issue of Super Chevy Magazine. Our old HEI distributor would not fit with the supercharger, so we changed to an MSD PN 85551 standard Pro Billet distributor ($205.88). Ahhh. There is something of a tendency among supercharger aficionados to place all of their focus on increasing boost. 1. While increasing pressure in the intake manifold can shove more air into the cylinder, that air may well go to waste if the engine itself is not set up to accommodate the blower. I was on the edge of detonation on the dyno. 15/23 15 OK, so the point here is to … Here’s a topside look at the Dart 4-bolt block. In 1970, GM increased the crankshaft stroke of the 427-cubic inch engine and achieved a displacement of 454 cubic inches. The heads flow a bit over 300 cfm on the intake side, which is decent for today, but astounding for 1971. We used Comp 960-16 valvesprings installed at a height of 1.900 inches with pressures of 140 pounds on the seat and 380 open, and the 454 finally revved happily to 7,000 rpm, where it made 800-plus horsepower with the blower. As we told you in Blower Basics (Part 1), boost is the amount of air pressure created by your supercharger and is the result of a combination of factors: engine displacement, blower displacement, and blower drive speed. However, the new cam threw away a pound to 1.5 pounds of boost below 5,000 rpm. 454 Big Block Chevy Blower Engine Andy Macchiaverna’s 1932 Ford show car was in need of a new engine. The cam is a single pattern, which means the intake and exhaust lobes have the same specs. A 350 Chevy will make 525hp on pump gas. If everything went perfectly, the motor would still not produce 1,000 horsepower at 14.7 psi since the blower likely required as much as 150 horsepower (or more) to drive the rotors. Both roots and screw blowers are great ways to make big power in any class of racing, and they’re perhaps the most tried-and-tue form of power adding in the game. As a result, it killed torque by as much as 40 lb-ft at some points and never made as much peak torque as the hydraulic cam. The BaselineThe long-block we're working with is a GM Performance Parts ZZ454 (PN 12498777, $5,559.99 at Scoggin-Dickey) that uses Edelbrock Performer RPM heads. That's borderline for boost on pump gas, but as we proved, this thing can run hard on Rockett Brand 93 octane. The compression ratio is even era-specific at 7.5:1. "You know the cam's not even a roller, right?" street/competition blower. He called Comp Cams and gave them the lobe numbers of the cam that didn't fit, plus information about when and how badly the valves hit the pistons. With aftermarket components, it … I was wondering what the difference is b/w a 6-71 and an 8-71 blower. We've seen several cases of making more power with less boost when airflow through the engine increases. In the case of boost, the answer is a resounding yes. From the top down, the blower scoop that feeds the engine is a vintage MPH part, which helps cram air directly into twin Demon 4150 blower carburetors that flow 1,000 cfm and are fitted with 97 primary and 99 secondary jets. 620-743101G6WRC Category: Engines & Blocks Brand Name: General Motors New GM Marine 454 - 305 Horsepower Long Block Engine 305 HP @ 4400 RPM / 435 lb. The blower's rotors are hard anodized and Teflon-stripped by The Blower Shop, a modification that helps seal the rotors to the case to make more boost with less rotor speed. Naturally, the truck-based 454s were tuned for torque, so … 900HP 8-71 Blown 454 Chevy. I had a 454 with a 174 B&M Blower that had 8.25:1. Shayne was taking on all comers in his blown Nova and was even top-ending some of the new turbocharged cars. This kit is available with 1 or 2 vbelt pulleys .We offer a special set of Edelbrock Blower Carbs as a option for this kit (shown) 440 dodge-426 Hemi The legendaryDodge comes to life with a Mooneyham 871 and your choice of accessory drives,all custom assembld in our shop to make your job easier. The screw blower is so efficient it doesn’t need all the extra cubic-inches to create the horsepower like a big cubic-inch nitrous or turbo motor does. The advertised compression ratio of the ZZ454 is 9.6:1, but our guesstimate based on the parts used is that it's closer to 9.25:1. The entire setup is lit by a voltage-independent Joe Hunt magneto that's locked out at 34 degrees of timing. Sometimes you just have to keep it simple; floor it with your blower motor, and beat the guy in the lane next to you! Click here for the 8-71 blower dyno chart, By clicking Sign Up, you agree to the  Terms of Use. 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