Time for the first dyno pull. All of our pulls were made from 4,100 rpm up through 5,900 rpm. With 6 quarts of break-in oil, and timing set at 24-degrees, we made 405 hp and 460 lb-ft of torque. A little on the low side, but as we started tuning and adding timing, we suspected we would see some more power. After two more pulls and virtually no improvement, we figured something was wrong. Time for the first dyno pull. All of our pulls were made from 4,100 rpm up through 5,900 r Finally...the moment of truth. There are few experiences more nerve-racking than starting a motor for the first time, but we knew we would have no problems with the GM Performance Parts ZZ454/440. Bob turned on the ignition and the fuel pumps, and the big-block immediately came to life. Oil pressure was steady at 75 psi, water temperature was steadily rising, and she idled nicely at around 1,600 rpm, as we made sure to break the 454 in properly. Finally...the moment of truth. There are few experiences more nerve-racking than starting Dave Jack, of Dave Jack Cylinder Heads, handed us a 950-cfm carburetor that he had heavily modified, and uses often when customers are having issues on the dyno. What could it make, 15 hp more? Dave Jack, of Dave Jack Cylinder Heads, handed us a 950-cfm carburetor that he had heavily We made one pull and as the motor was rising through the rpm range, we all looked at each other and knew we made some power. The engine sounded much more clean and crisp, equating to some serious horsepower numbers. We saw 491 hp and 517 lb-ft of torque- a whopping 86 hp and 58 lbs of torque over our initial tests. We made one pull and as the motor was rising through the rpm range, we all looked at each We started fiddling with the 770 Holley we originally slapped on the motor. We emptied the fuel, cleaned it out, opened and closed the secondaries, and bolted it on for another try. It turns out that the secondaries were caught-up on a linkage and once we got the problem fixed, the motor ran through the rpm like a dream. How does 491 hp and 521 lb-ft of torque sound? A lot better than the 440 GMPP rates it! We started fiddling with the 770 Holley we originally slapped on the motor. We emptied the Allowing for better airflow and increased volume, a carb spacer is almost guaranteed to make a few horsepower ... if you can fit it under the hood. We stole this 1 1/2-inch spacer from Dave. it should clear under our Camaro's L88-style hood, no sweat. Allowing for better airflow and increased volume, a carb spacer is almost guaranteed to ma Last but not least, we let the motor sit for about 20 minutes, slapped on a 1 1/2-inch carb spacer, and pushed the wand to WOT. What a great way to end the day. With the 770-cfm Holley right out of the box, 93-octane fuel, 34 degrees of timing, and the air/fuel ratio averaging 12.8, we could not have been happier with the result: 502 hp, 547 tq. Last but not least, we let the motor sit for about 20 minutes, slapped on a 1 1/2-inch car GM Performance Parts ZZ454/440Part Number:12498777Engine Type:Chevy big-block V-8Displacement (cu in):454Bore x Stroke (in):4.25 x 4.00Block (P/N 12561353):Cast iron with 4-bolt main capsCrankshaft (P/N 14096983):Forged steelCon. Rods (P/N 19170198):Forged steelPistons (P/N 10215228):Forged aluminumCamshaft (P/N 24502611):Hydraulic rollerCamshaft Lift (in):.510 intake / .540 exhaustCam. Duration (@ .050 in):211 degrees intake / 230 degrees exhaustHeads (P/N 12363392):Aluminum oval port; 110cc chambersValve Size (in):2.19 intake / 1.88 exhaustCompression Ratio:9.6:1Rockers (P/N 12368082):Stamped steelRocker Arm Ratio:1.7:1Water Pump (19168606):Cast iron, long-styleFlexplate (10185034):14-in.Recommended Fuel:92 octaneIgnition Timing:Base 4 degrees BTDC, 26 degrees TotalMax. Recommended rpm:5500Balanced:External SOURCES B&B PERFORMANCE MACHINE 1056 Randolph Ave., Dept. MMFF Rahway NJ 07065 GM Performance Parts www.gmperformanceparts.com « | 1 | 2 | View Full Article By Mike Ficacci Enjoyed this Post? Subscribe to our RSS Feed, or use your favorite social media to recommend us to friends and colleagues!