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( start page 1 of 2, 1968-9 INSTRUCTION SHEET FOR EDELBROCK STR-11 )
INSTRUCTION SHEET FOR EDELBROCK STR-11
(American Motors engines 290-, 343-, and 390)
AMC part # 2570 install kit # 2571
( ref, SBC STR-10 = part # 2560 & install kit # 2561)
REF - AMC instructions call for Edelbrock 2x4 # 2562 Conversion Kit...
? Does Edelbrock Chevy STR-10 Crossram vintage instructions ?
? ALSO call for the Edelbrock 2x4 # 2562 Conversion Kit ?
Carburetors
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1. For 290-, 343-, and 390-inch engines (applicable to
the 390 only where low rpm performance is required),
we recommend use of the Holley #R-1850-AAS (same as
1-14) which is rated at 600 cfm. Conversion Kit
(Edelbrock cat. no. 2562) includes all necessary
change-over parts and must be used to prevent car-
buretor flat-spots at the secondary opening point
(due to manual opening characteristics). Secondaries
must be operated by vacuum, and this conversion kit supplies
the pieces for this alteration.
Steps for the conversion are as follows:
a. Remove stock vacuum secondaries and automatic
choke mechanisms from the sides of the carbu-
retors.
b. If you wish, this is a good time to remove
both choke butterflies.
c. Assemble and install the provided secondary
diaphragm unit in the same way the stock pieces
were removed. If there is question concerning the
trueness of the diaphragm cover, dress it on a sur-
face topped with a sheet of grit paper and plunge
the cover in a bath of solvent before blowing it
out with air. Make certain that there are no
leaks between the secondary lid and body follow-
ing diaphragm installation. Also make sure
to provide a good seal between carb body and
diaphragm housing.
d. Install #68 primary jets and 0.076-inch drilled
secondary plates.
e. Set primary floats with a #10 drill bit
(0.195-inch o.d.) and secondary floates with
a #2 bit (0.220-inch o.d.). These drill bits
are used as gauges by placing them between the
float and the float bowl chamber with the chamber
inverted.
( end page 1 of 2, 1968-9 INSTRUCTION SHEET FOR EDELBROCK STR-11 )
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( start page 2 of 2, 1968-9 INSTRUCTION SHEET FOR EDELBROCK STR-11 )
cont'd.
2. For 390-inch engines (not required to perform
in low rpm ranges), use the Holley #S-4224 AAS
which is rated at 660 cfm. Stock jetting is
adequate for initial running and secondary opening
mechanism should remain manual. Set float levels
as per instructions for #R-1850-AAS
Manifold Installation
---------------------
Installation of the Edelbrock STR-11 is relatively simple.
You should exercise caution to provide adequate head-to-
manifold seal, and subsequent mixture contamination when the
engine is returned to service. Use new gaskets and seals
in all areas and make certain that each throttle linkage
member is free of binds and obstructions.
Fuel Pressure
-------------
This isavery important part of your manifold/carburetor
assembly. We suggest use of two Stewart-Warner fuel pumps
(S-W #D-240-A) mounted in parallel with two separate fuel
pickups from the fuel tank. Use two 1/2-inch (i.d.) neo-
prene fuel lines connected into a fuel block with two
3/8-inch (i.d.) neoprene lines joining the carburetors.
Fuel pressure should be a maximum of 7 psi at engine
idle) and 5 psi (at top engine speed, in traps, etc.).
We also recommend the use of a fuel pressure gauge
mounted to facilitate easy reading at all times. A lack
of adequate fuel pressure can lead to a lack of overall
engine performance.
Air Cleaners
-------------
For maximum performance from your new Tunnel Ram, we
suggest use of the #EC-902P air cleaners. These units
are designed around use on the STR manifolding and
normally provide adequate hood clearance. In situations
where large amounts of carb-to-hood clearance is avail-
able, use of other types of cleaners is sometimes
acceptable. Additional air cleaner/throttle linkage
information will be released immediately following avail-
ability. This data will be dispensed through your local
Edelbrock dealer, and we suggest that you contact him in
the near future if questions arise in your particular
installation.
( end page 2 of 2, 1968-9 INSTRUCTION SHEET FOR EDELBROCK STR-11 )
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end of document - 08-03-2020 - CKusTomSS
