Edelbrock 2121 User Manual
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Catalog #2121, 3721, 3723, 7121, 7521, 75213
Rev. 5/29/13 - QT/mc
©2013 Edelbrock LLC
Brochure #63-0350
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INSTALLATION INSTRUCTIONS
1) Use only recommended intake gaskets set when installing this intake manifold.
2) Fully clean the cylinder head intake flanges and the engine block end seal surfaces.
3) Apply Edelbrock Gasgacinch sealant P/N 9300 to both cylinder head flanges and to the cylinder head side of the gaskets,
allow to air dry, and attach the intake gaskets.
4) Do not use cork or rubber end seals. Use RTV silicone sealer instead. Apply a ¼” high bead across each block end seal
surface, overlapping the intake gasket at the four corners. This method will eliminate end seal slippage.
5) Install the intake manifold and hold-down bolts. Torque all of the manifold bolts in two steps by the sequence shown in
Figure 2 to 18-20 ft/lbs.
Performer RPM Series Intake Manifolds
1. Due to design, the fuel / air mixture and cylinder charging are very efficient with Performer RPM or RPM Air-Gap manifolds. Generally
speaking, the stock jetting for a Performer Series or Thunder Series carburetor will not need changing. Specific applications may show
an increase in power by tuning the fuel mixture.
2. Aftermarket distributor curve kits may be used with Performer RPM series manifolds.
3. Use modified or high performance cylinder heads such as our Performer RPM, and port-match the manifold to the heads.
4. The compression ratio should be at least 9.5 to 1 to work properly with Performer RPM camshafts.
5. Installation of aftermarket headers, camshafts or both with an Edelbrock Performer RPM series manifold may lean carburetor calibration.
Should this condition occur, recalibrate with a richer jet.
•
CAMSHAFT AND HEADERS: The Performer Series manifolds are compatible with aftermarket camshafts and headers designed to work in
the idle-5500 rpm range. Edelbrock has developed a dyno-matched, street proven camshaft (#2122 for 289-302 c.i.d. engines) for use with
Performer Series intake manifolds. Header primary tube diameter should be 1-5/8”. Performer RPM Series manifolds are compatible with
aftermarket camshafts and headers designed to work in the 1500-6500 rpm range. Edelbrock has developed dyno-matched, street proven
camshafts (#7122 or 2221 for 289-302 c.i.d. engines) for use with Performer RPM series manifolds (see catalog for details). Header primary
tube diameter should be 1-3/4”.
Stock Throttle Bracket
Throttle Plate
included w/ Manifold
Figure 1 - Throttle Plate
Figure 2 - 260-289-302 Ford Torque Sequence
Torque Bolts to 18-20 ft/lbs.
Firing Order: 1-5-4-2-6-3-7-8
Turn Distributor Clockwise to Advance Ignition Timing
5
8
2
10
12
4
6
7
3
11
9
1
8
7
6
5
4
2
1
3
8
1
4
2
3
6
5
7