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Big-Block Chevy Crate Engine - Back To The Street, Part 1

We Found More Than Expected In A GM Performance Parts ZZ454
By Mike Ficacci
Photography by Mike Ficacci, Evan Smith
GMPP ZZ454 Big Block Engine
GMPP ZZ454 Big Block Engine 1971 Camaro
GMPP ZZ454 Big Block Engine
We went to B&B Performance... 
   
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GMPP ZZ454 Big Block Engine
We went to B&B Performance Machine in Rahway, New Jersey, where Bob Oster already had the big-block sitting on the dyno. Bob brews up some of the fastest high-performance engines in the business. Our untouched ZZ454 was tested right out of the crate.
GMPP ZZ454 Big Block Engine
GM Performance Parts recommends... 
   
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GMPP ZZ454 Big Block Engine
GM Performance Parts recommends 92-octane fuel and a Holley 770-cfm carburetor. We did one better and used 93-octane fuel, as that is the highest octane readily available at the pump in the Garden State.
GMPP ZZ454 Big Block Engine Break In Oil
We filled the pan with 6 quarts... 
   
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GMPP ZZ454 Big Block Engine Break In Oil
We filled the pan with 6 quarts of Royal Purple Break-In oil, and primed the motor to make sure oil had reached all corners and there were no blockages through the pushrods and into the stamped steel rockers. As he was priming, Bob turned the motor over a few time to ensure proper oiling.
GMPP ZZ454 Big Block Engine Carburetor
Here, Super Chevy Senior Editor... 
   
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GMPP ZZ454 Big Block Engine Carburetor
Here, Super Chevy Senior Editor Evan Smith is hot-wiring the electric choke blade open. On the dyno, in a controlled environment, the electric choke was unnecessary and could have potentially impeded our testing.
GMPP ZZ454 Big Block Engine Header
We slapped on a set of 2-inch... 
   
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GMPP ZZ454 Big Block Engine Header
We slapped on a set of 2-inch Hooker headers with collectors. We tried a few different sets of header sizes, ranging from 1 7/8-inches to 2 1/8, but found that the 2-inch set with the merge collectors on the end made the best power throughout the entire range.
GMPP ZZ454 Big Block Engine Timing
For the warm-up period and... 
   
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GMPP ZZ454 Big Block Engine Timing
For the warm-up period and initial testing, we set the total timing to 24-degrees as per the recommendation of GM Performance Parts.
GMPP ZZ454 Big Block Engine Fuel Pressure
Static fuel pressure was at... 
   
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GMPP ZZ454 Big Block Engine Fuel Pressure
Static fuel pressure was at 7 psi and that is exactly where we wanted it to be. Setting fuel pressure any higher is unnecessary, as the Holley carburetor was running like a champ and the air/fuel ratio was right at 13:1 through the rpm range. We put the SuperFlow hat to intake to measure exactly that.

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GMPP ZZ454 Big Block Engine Dyno Test GMPP ZZ454 Big Block Engine Carburetor
GMPP ZZ454 Big Block Engine Dyno Test GMPP ZZ454 Big Block Engine Dyno Test

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