Author Topic: Crossram manifold  (Read 110019 times)

MO

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Re: Crossram manifold
« Reply #120 on: January 18, 2021, 10:59:12 PM »
I always enjoyed the humor of C&D writers when I read the magazine regularly.

PHAT69AMX

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Re: Crossram manifold
« Reply #121 on: September 05, 2021, 06:42:27 PM »
Hello, hope everyone is having a Wonderful 2021 Labor Day Weekend!
Thought no harm asking if anyone might have and be willing to share images of vintage original
1969-ish EDELBROCK # 2560 STR-10 SB Chevrolet Crossram Intake Manifold Instructions ???

These are images of 1969-ish EDELBROCK # 2570 STR-11 AMC Crossram Intake Manifold Instructions.

Very very curious just what the Edelbrock Chevrolet Instructions might have to say.

It would be greatly appreciated if someone happens to have and shares the SBC Edelbrock Instructions Version.

Peace.


Jon Mello

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Re: Crossram manifold
« Reply #122 on: September 10, 2021, 12:35:43 AM »
I don't have Edelbrock instructions for the Edelbrock STR-10 for Chevy small block and have never seen them either.  Hopefully somebody else here has a copy and is willing to post it for us.  Thanks for posting the AMC version.  If you could edit them to be a little larger it would make it easier for some of us to read.
Jon Mello
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PHAT69AMX

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Re: Crossram manifold
« Reply #123 on: September 10, 2021, 03:40:19 AM »
Better resolution images are too large file size, typed text :

( 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
-----------

      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 )

------

( 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 )

---------------------
end of document - 08-03-2020 - CKusTomSS


Jon Mello

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Re: Crossram manifold
« Reply #124 on: September 16, 2021, 03:16:39 AM »
Thanks!
Jon Mello
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PHAT69AMX

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Re: Crossram manifold
« Reply #125 on: September 28, 2021, 11:56:58 PM »
Second attempt for improved image quality, please advice if these are more legible, Peace


Jon Mello

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Re: Crossram manifold
« Reply #126 on: September 29, 2021, 12:34:54 AM »
Yes, those are better.  Thanks for going to the trouble.
Jon Mello
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PHAT69AMX

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Re: Crossram manifold
« Reply #127 on: January 09, 2022, 10:47:31 PM »
A significant consideration is those Edelbrock AMC CrossRam Intake Instructions...
were written and done before the Double Pumper ever had existed yet...
Except for only a few well informed people I'd guess and those who noticed,
as for 3/4's to 2/3rds of 1968 GM was running double pumpers in TransAm & on the L88's, were they not?  And no one else had them, correct ?  They were a brand new idea in 2nd quarter '68, no?
So the above Edelbrock Instructions that talk about using a pair of modified List 1850's or a pair of List 4224 660's... it makes no mention of a pair of little 600 Double Pumpers BECAUSE THEY DID NOT EXIST YET!
Although, almost, kinda, like right at about the exact same time, ? April 1968...
GM developed and issued the 2nd Design 2x4 302 4295 "600 DP" Holley...
A CrossRam just loooooves a pair of small 600 double pumpers don't they?

Jon Mello

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Re: Crossram manifold
« Reply #128 on: January 11, 2022, 02:29:13 PM »
I am not 100% sure but I think the earliest 4295 date I have seen is 891 which is the first week of September '68.  Maybe somebody else can chime in with an earlier date.
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BULLITT65

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Re: Crossram manifold
« Reply #129 on: January 13, 2022, 08:07:51 PM »
I just got confirmation from Wayne Guinn, he said you are correct Jon the earliest date is 891. 🙂
1969 garnet red Z/28 46k mile unrestored X77
-Looking for 3192477 (front) spiral shocks 3192851 (rear)
-Looking for an original LOF soft ray windshield
-Looking for original Delco side post negative battery cable part # 6297651AV

Jon Mello

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Re: Crossram manifold
« Reply #130 on: January 17, 2022, 04:07:47 PM »
Nice confirmation.  Thanks!
Jon Mello
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TA COUPE

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Re: Crossram manifold
« Reply #131 on: February 24, 2022, 10:45:14 AM »
? Possibly post a pic of the 3-Step style for reference ?
I do not have real parts or carbs on hand, just past Holley experience.
? 1st Design 4210 had "1:1" basically constant radius slot, except a slight primary tip-in ?
? 2nd Design 4295 2-Step "W" Slot is a "staged" design, primaries 1st x degrees, then secondaries ?
I myself have not seen a 3-Step, would be interesting to see.
My grandiose ideas, lol, "I'll make a nice 3D Model animation of the 3 styles"... LOL

John forgot to post a picture of the 3 step cam so I  will post the picture I sent him from before he bought the carbs from Rich Rodeck who restored the Follmer Mustang and a few others.

          Roy

Jon Mello

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Re: Crossram manifold
« Reply #132 on: February 25, 2022, 01:58:18 AM »
Thank you, Roy!
Jon Mello
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crossboss

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Re: Crossram manifold
« Reply #133 on: March 05, 2022, 06:27:24 PM »
Speaking of Cross-Rams, here is a very interesting rare piece:




Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)

Jon Mello

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Re: Crossram manifold
« Reply #134 on: March 05, 2022, 09:48:27 PM »
The top picture is not a match for the other three.  Totally different base in the last three.
Jon Mello
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