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©2002 Edelbrock Corporation
Catalog #70021 & 70022
Brochure #63-0129
Rev. 9/02
Page 3 of 3
Nitrous and Fuel Jetting Selection
The dyno tests for your Performer RPM Upgrade Kit were conducted at Edelbrock using a mildly modified 350 cubic-inch
engine. Both dual-plane and open-plenum intake manifolds were tested to ensure validity of jetting maps for each
horsepower setting. Modifications included Edelbrock intake manifolds, Edelbrock aluminum heads, dyno headers, and
improved ignition. We also used different grades of fuel and colder plugs during the testing. All stated timing adjustments
listed in jet maps is where the motor being tested worked best. Final timing should be adjusted to achieve best power
and/or MPH per application. These tests were conducted at 950 psi nitrous bottle pressure and 5.5 psi fuel pressure.
Square-Flange Jet Map
Nitrous/Fuel Jetting Approx. HP Gains Final Air/Fuel Ratio Timing Adj. Footnotes
55/61 100hp 11.0:1 32 Deg. Total 1, 3
71/75 150hp 11.0:1 30 Deg. Total 1, 3
78/82 175hp 11.0:1 30 Deg. Total 1, 3
85/89 200hp* 11.0:1 28 Deg. Total 2, 4, 5
99/102 250hp* 11.0:1 26 Deg. Total 2, 4, 5
*The 200 and 250 horsepower settings are for single plane manifolds only. In testing, we found that dual plane manifolds
have some distribution problems at these high flowrates that could cause engine damage.
Spread-Bore Jet Map
Nitrous/Fuel Jetting Approx. HP Gains Final Air/Fuel Ratio Timing Adj. Footnotes
59/62 100hp 11.0:1 32 Deg. Total 1, 3
71/75 150hp 11.0:1 30 Deg. Total 1, 3
81/86 175hp 11.0:1 30 Deg. Total 1, 3
Jet Map Footnotes
The jet map above has footnotes that offer the following instructions and technical information:
1 - Spark Plugs use Champion RC-12-YC or equivalent.
2 - Spark Plugs use Champion C-61C or equivalent.
3 - Fuel use 92 octane pump gasoline or better.
4 - Fuel use 110 octane race gasoline or better.
5 - Single Plane manifolds only. DO NOT use a dual plane manifold at this horsepower level.
The jetting patterns are designed to be rich and will provide the above listed power settings under normal operational
usage of the system. Any variation in jetting patterns other than what is listed above and engine damage could occur.
Please contact the Edelbrock Technical Department with any questions you have concerning jetting patterns and their
effects on engine performance.
Edelbrock Corporation
2700 California Street
Torrance, CA 90503
Tech Line: (800) 416-8628
Tech Fax: (310) 972-2730
Tech E-Mail: edelbrock@edelbrock.com