STR-11 Crossram ?
Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=96823
Printed Date: Apr/19/2024 at 4:37pm
Software Version: Web Wiz Forums 12.03 - http://www.webwizforums.com
Topic: STR-11 Crossram ?
Posted By: bwamx
Subject: STR-11 Crossram ?
Date Posted: Oct/13/2018 at 7:30pm
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I Have an original part numbered AM 4486228 68-69 STR-11 Crossram . I know it is original as I've been running it since the early 80's. Dennis might be able to ask someone , but I think I have a very early top casting. No STR 11 cast into it by the front Edelbrock. Also on my intake see pic below, the area by the accelerator pump arm has no clearance cast into top for both carbs, as all the other intakes I've seen have . The bolt under the drivers side front float bowl is counter bored and not cast open like the newer ones. I Don't think I've seen another top like mine. Has anybody else ? Also don't have the post count to post in the Ebay section , but the Canadian intake is also cracked by the driver side carb, rear inside stud. I have a crack in the same spot. Bob    |
Replies:
Posted By: ccowx
Date Posted: Oct/13/2018 at 10:05pm
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I know that some of the early Group 19 parts, especially the ones that would be homolgamation parts for racing, did not have the manufacturer's name or part numbers on them. Apparently AMC thought that was important for homolgamation because of a mis-understanding of the rules. I hope that helps! Chris
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Posted By: THE MENACE
Date Posted: Oct/15/2018 at 10:28am
Is yours different than this one??  ------------- Former Owner of: The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's car) 72 Gremlin Autocross Project. |
Posted By: bwamx
Date Posted: Oct/15/2018 at 11:28am
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Dennis, Yes, Look at the 1st picture under the accelerator pump. it seems they added clearance for the arm of the accelerator pump and recessed it deeper for the bolt also on the driver side. Possibly to clear a 50 CC Pump arm ?
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Posted By: PHAT69AMX
Date Posted: Oct/15/2018 at 12:10pm
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Speaking of CrossRam Intakes... The Menance, if I may, I have an inquiry for Edelbrock... Question: Can the Edelbrock AMC CrossRam Intake Manifold be made with a "Rear Central D/S Carb Bellcrank Relief Pocket" to accommodate the Driver's Side Carb facing "backwards" like on the SBC GM & Offenhauser CrossRam Manifolds which may provide "more symmetrical mixture distribution" and "compact" central location of Linkages & Fuel Lines ? Was or is there a reason Edelbrock did not on the AMC CrossRam ?   -------------  Link to a http://www.youtube.com/watch?v=MySiKQsmWxU" rel="nofollow - Short YouTube Burnout Video |
Posted By: THE MENACE
Date Posted: Oct/15/2018 at 1:20pm
It could have been made that way back in the day if that had been proven to be a better design or if that was what AMC or the race teams back then had asked for. One of the guy's who could probably answer that question retired from Edelbrock earlier this year, and the other person (Vic Edelbrock) passed away in 2017. ------------- Former Owner of: The Craig Breedlove "AERO AMX" Still Owner: SS/AMX #9 replica (THE BIG MENACE) 70 AMX 416, EFI, Nash 5 speed 70 Javelin 401, 727 (Wife's car) 72 Gremlin Autocross Project. |
PHAT69AMX wrote:Posted By: Gary Gray AMX
Date Posted: Apr/26/2022 at 8:34am
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Does anyone know how many of the original & how many reproductions where made of the STR-11. I have one which I believe is a 2nd gen model. thanks Gary
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Posted By: ccowx
Date Posted: Apr/26/2022 at 9:27am
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I recall hearing back in the late 80's, probably from Larry Mitchell, that they made about 300 of the early and 300 of the late versions. Chris
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Posted By: Gary Gray AMX
Date Posted: Jun/06/2023 at 9:47am
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Chris, Thanks for the info - I've been asked a tousand times and never had a good answer. This is at least close if not right on. Gary ------------- Gary |
Posted By: ccowx
Date Posted: Jun/06/2023 at 10:50am
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Please take it for what it is, the fallible recollections(mine!) of an offhand comment from Larry Mitchell. Larry is by far the more reliable, but he never cited any source for his information. All that being said, being AMC'ers sometimes this is all we have! Chris
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Posted By: bwamx
Date Posted: Jun/06/2023 at 11:34am
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And as a side note. I have never came up with an answer to my original post. Every crossram I look at and check, I still have not seen another one with the same configuration of the bolt holes as mine ,and lacking the clearance for the accelerator pump. Bob ------------- 73 Jav-AMX " The Black Widow" 358cu/in Crossram T-10 9" Rear |
Posted By: Gary Gray AMX
Date Posted: Jun/06/2023 at 11:34am
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Better than nothing Thanks again ------------- Gary |
Posted By: PHAT69AMX
Date Posted: Jun/06/2023 at 2:47pm
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bwamx - A number of period sources prove the S/S AMX Crossram was first fitted with Holley list 4210 carburetors. They were 1968 "1st Design" Chevy Z28 Trans Am 302 Crossram carburetors that Chevy quickly superseded in mid-1968 to the "2nd Design" Holley List 4295 which just so happens by the way to be the 1st EVER Holley Double Pumper carburetor. So the List 4210 was now "obsolete" and along comes the AMC Hurst S/S AMX Project in Dec '68, Jan '69, and the List 4210 got a second chance and became the Holley List 4584 AMC Part # 448 7187 S/S AMX 2x4 Crossram carburetor. The 4210 / 4584 are Primary side only Single Pumper Carbs with 1:1 ratio mechanical Secondaries, as well as a "660 Center Squirter Style" Cam-Follower-In-Slot 1:1 Bellcrank, but with an additional "feature" due to the z28 Crossram 2x4 carb mounting, plumbing, and linkage. Only the 4210 & 4584 have a little extra material with a 1/4" dia. hole in it at the BOTTOM of the Bellcrank. This extra hole is for a simple "Interlink Rod" to attach to that GM used to actuate both carbs simultaneously with a single throttle cable. The passenger side S/S AMX List 4584 Holley carbs Bellcrank is actually ALTERED to clear the Lid Relief Pocket for the passenger side bellcrank. The "extra GM specific material and hole" at the bottom of the GM specific bellcrank IS GROUND OFF of the passenger side SS AMX list 4584 carburetor! The obsolete Chevy Z28 2x4 Holley List 4210 has a number of unique features that were carried over when used on the S/S AMX that were not needed on the AMX. When the Hurst S/S AMX was done the Holley Double Pumper did NOT exist yet, except at GM where they developed it in very very early 1968. Holley did not unleash the Double Pumper onto the general public until about January 1970. So, the AMC Edelbrock Crassram Intake was designed when there were NO Double Pumper Carbs, and the universal Throttle Bellcrank we are all familiar with had not yet been designed either. The AMC Crossram was designed for a Holley List 1850 Vacuum Secondary or a list 4224 660 Center Squirter, and the Lid Features or mounting clearance details reflect that. If I am properly understanding your picture and your post, there are some reasons in history why there could be some carburetor mounting issues. Peace.
------------- Link to a http://www.youtube.com/watch?v=MySiKQsmWxU" rel="nofollow - Short YouTube Burnout Video |
Posted By: Jeff Lee
Date Posted: Jun/10/2023 at 11:49am
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Phat has all his ducks in a row on this! FYI - quick fuel technologies (QFT) came out with a NHRA legal replacement carburetor. I think it is called QFT585? It was a performance enhancement for the guys running NHRA SS with their cross ram 390 cars. Unfortunately, they no longer produce it, now that Holley owns QFT, I would like to find a pair of those QFT Carburetors. Never know when they may come in handy…
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Posted By: PHAT69AMX
Date Posted: Jun/10/2023 at 3:27pm
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Jeff Lee - Thank you bwamx - here is a picture of an AMC Crossram Lid, is yours different than this one? ------------- Link to a http://www.youtube.com/watch?v=MySiKQsmWxU" rel="nofollow - Short YouTube Burnout Video |
Posted By: PHAT69AMX
Date Posted: Jun/10/2023 at 6:49pm
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Jeff Lee - might this be the Quickfuel S/S Crossram legal carburetor? UPC 849804015342 Part No. SSR-585-VS or maybe not, this one is a vacuum secondary, https://www.holley.com/products/discontinued_product/parts/SSR-585-VS" rel="nofollow - https://www.holley.com/products/discontinued_product/parts/SSR-585-VS ------------- Link to a http://www.youtube.com/watch?v=MySiKQsmWxU" rel="nofollow - Short YouTube Burnout Video |
Posted By: Trader
Date Posted: Jun/10/2023 at 7:10pm
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From the picture in the first post it looks like the carburetor that came on the Cobra of the era. Trying to get a picture of the original QFT carburetor seems to be difficult. This QFT carburetor comes very close with the different throttle linkage that looks like it would not need the depression beside the carburetor mount to rotate: https://www.dragzine.com/news/running-on-corn-quick-fuel-technologies-offers-e-85-carburetors/" rel="nofollow - https://www.dragzine.com/news/running-on-corn-quick-fuel-technologies-offers-e-85-carburetors/
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Posted By: JERSEYJOE
Date Posted: Jun/26/2023 at 8:06pm
------------- 1985 J-20 PLOW TRUCK 1977 CJ 7 360 T-18 D 300 1970 AMX ex-SCCA car SPEED COSTS MONEY HOW FAST DO YOU WANT TO GO? |