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Figure 3—Remove shaded area to provide clearance for throttle
or kick-down bracket
Figure 2—262-400 c.i.d. Chevrolet
Firing Order— 1-8-4-3-6-5-7-2
Turn Distributor Counter Clockwise to Advance Timing
3. Eliminate the end seals. Use automotive grade RTV silicone instead. Apply a bead of sealant approximately 1/4" high across the block
end seal surface, overlapping the intake gasket at the four corners. This method eliminates end seal slippage and deterioration.
4. For ease of installation, we recommend using Edelbrock Manifold Bolt & Washer Kit, #8504.
• MANIFOLD TORQUE—Torque all manifold bolts circled in Figure 1 to 25 ft/lbs. See Figure 1 for proper sequence.
• FIRING ORDER AND CYLINDER NUMBERING—For firing order and cylinder numbering, see Figure 2.
• REAR WATER BOSSES
We've included two 3/8"-NPT threaded holes over the rear water outlets of the heads. By plumbing the coolant from these outlets to the
front water crossover, you can reduce overall engine operating temperature. This has proved helpful in circle track racing applications.
If you don't wish to take advantage of this feature, plug the holes with two 3/8"-NPT pipe plugs included with the manifold.
• FINAL TUNING FOR OPTIMUM PERFORMANCE
NOTE: Local emission laws must be checked for legality of any carburetor or ignition changes.
1. Due to design, the fuel / air mixture and cylinder charging are very efficient with the RPM Air-Gap manifold. Generally speaking, the
stock jetting for the Performer Series carburetor #1407 will not need changing. Specific applications may show an increase in power by
enrichening the secondary jetting .003 from the stock setting (from 0.107" to 0.110").
2. Aftermarket distributor curve kits may be used with RPM Air-Gap manifolds.
3. Use modified or high performance cylinder heads such as our #6071 or #6073, and port-match the manifold to the heads.
4. The compression ratio should be at least 9.5 to 1 to work properly with the #7102 camshaft.
5. Installation of aftermarket headers, camshafts or both with an Edelbrock RPM Air-Gap manifold may lean carburetor calibration.
Should this condition occur, recalibrate with a richer jet.
• CAMSHAFT AND HEADERS
The RPM Air-Gap manifold is compatible with aftermarket camshafts and/or headers. Edelbrock has developed a dyno-matched, street
proven camshaft, the #7102 which is suitable for use with the RPM Air-Gap #7501.This camshaft will require the use of high perfor-
mance rocker arms, studs, retainers, and Edelbrock Sure-Seat valve springs #5703. Header primary tube diameter should be 1-3/4".
• PLEASE complete and mail your warranty card. Be sure to write the model number of this product in the “Part #____” space.
THANK YOU
Figure 1—Intake Manifold Tightening Sequence
12
10
11 4
1
5
6
9
3 2
7
8