Edelbrock 2121, 7521, 3721, 3723 User Manual
Catalog #2121, 3721, 3723, 7121, 7521, 75213
Rev. 1/08 - AJ/mc
©2008 Edelbrock Corporation
Brochure #63-0350Page 1 of 3
Performer and Performer RPM Intake Manifolds
For 260-302 c.i.d. Small Block Ford Engines
Catalog #s 2121, 3721, 3723, 7121, 7521 & 75213
INSTALLATION INSTRUCTIONS
PLEASE study these instructions carefully before beginning this installation. Most installations can be accomplished with common tools and
procedures. However, you should be familiar with and comfortable working on your vehicle. If you do not feel comfortable performing this
installation, it is recommended to have the installation completed by a mechanic. If you have any questions or problems, please call our Technical
Hotline at: 1-800-416-8628, 7:00 am - 5:00 pm, Pacific Standard Time, Monday through Friday or e-mail us at edelbrock@edelbrock.com.
• DESCRIPTION:
Edelbrock Performer series intake manifolds are designed for engines operating in the idle to 5500 rpm range. Performer RPM series intake
manifolds are designed for engines operating in the 1500-6500 rpm range. Match Performer or Performer RPM intake manifolds with
recommended carburetors and additional equipment for even greater performance increases.
APPLICATIONS:
INTAKE MANIFOLD REFERENCE APPLICATION
2121 B, C, D Performer 289: Designed for street 260-289-302 c.i.d. Ford V8s without EGR. Will not
fit Boss 302 or 255 c.i.d. V8s.
3721, 3723 B, C, D Performer 302 4-V (3721) and Performer 302 2-V (3723) - Designed for carbureted 302
c.i.d. Ford V8s with EGR. 3721 replaces the stock 4V EGR manifold using the stock 4v
EGR adapter. 3723 includes a 2-bbl EGR plate, allowing the use of the stock 2-bbl
carburetor and EGR valve. Both manifolds can be adapted for 4-bbl use by using our
#8053 4V EGR plate and the OEM EGR valve and gasket. Our #8017 adapter kit and Ford
#E4ZZ9A-589E spacer may be substituted for our 8053 EGR plate. For 4V off-highway,
non-EGR applications, use our #8714 spacer.
7121 B, C, D Performer RPM 302: Designed for 289-302 c.i.d. Ford V8s for high-performance use.
No provision for exhaust heated choke. Will not fit 255 c.i.d. V8.
7521, 75213 A, C, D RPM Air-Gap 302: Designed for 289-302 c.i.d. Ford V8s. Features an Air-Gap design,
resulting in a cooler, denser charge for more power. No provisions for exhaust heated
chokes and no exhaust crossover.
A- Not legal for sale or use on pollution controlled motor vehicles.
B- Stock replacement/street legal in some applications. See “Stock Replacement Parts List for Intake Manifolds” insert, or Catalog for details.
C- Available in additional finishes, such as polished, PermaStar, or EnduraShine. See Catalog for details.
D- Aftermarket 4-bbl carburetors are not compatible with Ford AOD. Performer Series and Thunder Series AVS carbs will work with Ford AOD
when used with Lokar bracket SRK-4000, for more info call (865) 966-2269 or go to www.lokar.com
• EGR SYSTEMS: Edelbrock EGR-equipped
Performer
manifolds are intended as a direct functionally identical replacement for their O.E.M.
counterparts. All exhaust emissions or emissions related stock components are intended to be retained and functional. Non-EGR equipped
manifolds will not accept stock EGR (Exhaust Gas Recirculation) equipment. EGR systems are used on most 1972 and later model vehicles.
Check local laws for requirements.
• ACCESSORIES & INSTALLATION ITEMS: Major recommendations are listed below. See our catalog for details. To order a catalog, call
(800) FUN-TEAM, or visit www
.edelbrock.com.
• CARBURETOR RECOMMENDATIONS:
Manifold 2121, 3721, 3723 (Emissions Controlled Applications):
CARBURETOR REFERENCE PARTS REQUIRED FOR INSTALLATION
OEM B, H, N
Catalog #2121, 3721, 3723, 7121, 7521, 75213
Rev. 1/08 - AJ/mc
©2008 Edelbrock Corporation
Brochure #63-0350Page 2 of 3
Manifold 2121 (Non-Emissions):
Manifold 7121, 7521, 75213 (Non-Emissions):
• THROTTLE BRACKETS: Due to the design of Performer manifolds, the throttle and kickdown bracket on some vehicles may require
modification to fit. When using Edelbrock carburetors, use #1490 or 1845 throttle plate kit. See Figure 1.
• GASKETS: Do not use competition style intake gaskets for this street manifold. Due to material deterioration over time, internal leakage of
vacuum, oil, and coolant may occur.
A-Carburetor will work with non-EGR or pre-emission control systems.
B-Carburetor will work with EGR system.
H-Carburetor has provision for evaporative canister.
I-Carburetor has no provisions for evaporative canister.
K-Carburetor requires #8008 or #8024 stud, washer and nut kit. Determine proper length based on gasket thickness and your accessory
mounting requirements.
N-Carburetor accepts factory cruise control
O-Carburetor comes with manual choke. It can be converted to electric choke using kit #1478.
P-Carburetor is not a stock replacement part
CARBURETOR REFERENCE PARTS REQUIRED FOR INSTALLATION
Performer #1403 (500 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1404 (500 cfm) A, I, K, N, O #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1405 (600 cfm) A, I, K, N, O #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1406 (600 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1805 (650 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1806 (650 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1825 (650 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1826 (650 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
CARBURETOR REFERENCE PARTS REQUIRED FOR INSTALLATION
Performer #1407 (750 cfm) A, I, K, N, O #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1411 (750 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1412 (800 cfm) A, I, K, N, O #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Performer #1413 (800 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1812 (800 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
Thunder Series #1813 (800 cfm) A, I, K, N #1490 or 1845 throttle plate kit, #1483 or 1844 throttle lever adapter
INTAKE MANIFOLD RECOMMENDED GASKET
2121, 3721, 3723, 7121, 7521, 75213 Edelbrock #7220 Port: 1.20” x 2.00”, .060” Thickness
NOTE: To ensure maximum performance and a proper seal, Edelbrock gaskets which are
specifically designed and manufactured for use with Edelbrock parts must be used.
• PREP AND TUNING FOR POWER:
NOTE: Local emission laws must be checked for legality of any carburetor or ignition changes.
Performer Series Intake Manifolds
1. The long equal length runners in the Performer manifold create a very strong signal to the carburetor. In some applications, the stock
rods or jets may need changing for best overall performance. Refer to your carburetor owner's manual for details.
2) Performer manifolds deliver excellent drivability and power utilizing stock distributor settings. Some applications may benefit from
resetting the initial advance ±2° from the factory specification.
3) Aftermarket ignitions and more aggressive advance curves may be used with Performer packages.
4) Installation of aftermarket headers or camshafts may lean the carburetor calibration. Should this occur recalibrate with a richer jet.
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