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GASKETS: Do not use competition-style intake gaskets for this street manifold. Due to material deterioration over time, internal leakage of
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vacuum, oil, and coolant may occur.
INTAKE MANIFOLD
5426, 7526
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.
SPECIAL NOTE: This intake manifold is primarily intended for use with Vortec-style heads on pre-Vortec blocks. Standard engine blocks
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route the thermostat bypass water from the block directly to the water pump through the passenger side water pump mounting flange. If the
manifold is used on a 1996 or later Vortec engine that does not have the in-block bypass passage, you must route a thermostat bypass hose
from the water bypass port on the front of the intake manifold to the 5/8" hose nipple on the passenger side of the Vortec water pump. Use
a 3/8" NPT (pipe thread) to 5/8" hose nipple fitting, and a 7" length of 5/8" hose to accomplish this. If your engine block has the thermostat
bypass passage, use the 3/8" NPT plug supplied in the kit to plug the bypass port in the front of the intake manfold.
PREP AND TUNING FOR POWER:
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NOTE: Please refer to Edelbrock Performer Series Carburetor Owner's Manual for detailed tuning procedures.
1.
The 5426 manifold will produce optimum power and drivability when used with #1404 carburetors. Edelbrock has found, while dyno
testing our Performer 350ci (310hp) crate engine at our location, the best calibration to be: Metering Rods - .065" x .052", Primary Jets
- .086", and Secondary Jets - .095". The 7526 manifold will see optimum performance with the use of 1804 carburetors. The 1804
carburetors are specifically tuned for the 7526 manifold and the stock calibration should be used. Calibrations will vary according to
engine build and atmospheric conditions. Use these recommendations as a starting point. Further tuning may be necessary.
2.
Aftermarket distributor curve kits may be used with this intake manifold.
3.
Use modified or high performance cylinder heads such as our Performer or Performer RPM.
4.
Installation of aftermarket headers, camshafts or both may lean carburetor calibration. Should this occur, recalibrate with a richer jet.
CAMSHAFT AND HEADERS: Dual Quad manifolds are compatible with aftermarket camshafts and headers. Header primary tube diameter
should be 1-5/8" to 1-3/4" depending on the specific engine combination. Edelbrock has developed two camshafts for use with this intake
manifold - Performer-Plus #2103 or Torker-Plus #5002. Please check the catalog or website for rpm and application guidelines.
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.
Apply removable thread lock, such as blue Loctite, to the intake
bolt threads. Install the intake manifold bolts. Carefully tighten
the intake manifold bolts evenly until the intake manifold has
lightly compressed the gasket.
6.
Torque all of the manifold bolts in two steps by the sequence
shown in Figure 1 to 11 ft/lbs.
Catalog #5426, 7526
Rev. 1/06 - RS/mc
REFERENCE
(None)
Edelbrock Corporation • 2700 California St. • Torrance, CA 90503
Tech Line: 800-416-8628 • E-Mail: Edelbrock@Edelbrock.com
RECOMMENDED GASKET
Edelbrock #7235 Port: 1.08" x 2.11", .120" Thickness
INSTALLATION PROCEDURE
Figure 1 - 262-400 c.i.d. Small Block Chevy Torque Sequence
Turn Distributor Counter-Clockwise to Advance Timing
Page 2 of 2
Torque Bolts to 25 ft/lbs.
Firing Order: 1-8-4-3-6-5-7-2
©2006 Edelbrock Corporation
Brochure #63-0271
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