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Old 01-10-2017, 05:13 PM   #1
1969A56
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Default STR 12 Cross ram info

Does anyone have or know where I can find indepth information on an STR 12 cross ram for a 340 mopar? I have an unused Edelbrock STR 12 but can't seem to locate any constructive info. on carbs used, problems etc. I've read about the ones used on the Z-28, but this group at Class Racer seems to have tried everything.
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Old 01-11-2017, 05:37 PM   #2
Myron Piatek
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Post Re: STR 12 Cross ram info

There was a magazine article (forgot which one) back in the early '70's that did, I believe, a 2 part build/test on a 340 4-speed Demon. They would add a part, & run it at a track. The STR 12 was part of the test and may have included 2 different carbs. Possibly jetting. I have the magazine, but it's been a while since I've read it and don't know where it is.


Maybe someone remembers the magazine, article and has a source for it.


Google "Edelbrock STR 12". Many discussions, but don't know if there is any hard core testing on them.
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Old 01-11-2017, 06:19 PM   #3
1969A56
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Default Re: STR 12 Cross ram info

Thank you, Ive googled till I'm googled out. Mostly opinions on STR 12, I'll keep looking. The article on the Z-28 was very informative about cams, rear gears etc. The author did state that he put a spacer between the plates but that the thickness of said plate was top secret. lol
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Old 01-12-2017, 09:01 AM   #4
340Cuda
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Default Re: STR 12 Cross ram info

If you have access to the old Chrysler Tune Up Tips and books of the day I think there is some information there.

I know there is a brief mention in one of Larry Shepard's books about them that show where some dams need to be installed to help with fuel distribution.

Good Luck,
Bill
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Old 01-12-2017, 07:27 PM   #5
1969A56
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Default Re: STR 12 Cross ram info

Thank you Bill, I just looked him up and he's still wrenching out of Akron. I appreciate that info.

Last edited by 1969A56; 01-12-2017 at 08:28 PM.
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Old 01-13-2017, 09:02 AM   #6
340Cuda
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Default Re: STR 12 Cross ram info

Quote:
Originally Posted by 1969A56 View Post
Thank you Bill, I just looked him up and he's still wrenching out of Akron. I appreciate that info.
I think that may be a different Larry Shepard. The one I am talking about is a former Chrysler engineer.

Bill
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Old 01-14-2017, 08:09 PM   #7
James L Miller
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Default Re: STR 12 Cross ram info

I seem to remember Hot Rod magazine doing an article on a 340 Duster. John Dianna took it and eventually ran it in Modified Production. Probably did the first article in 1970.
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Old 01-15-2017, 01:19 AM   #8
1969A56
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Default Re: STR 12 Cross ram info

Thanks, I think that was a tunnel ram, but not a cross ram
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Old 01-21-2017, 06:53 PM   #9
House of Darts
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Default Re: STR 12 Cross ram info

It was a dual quad. Ran E/MP and D.
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Old 07-11-2017, 08:04 AM   #10
James L Miller
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Default Re: STR 12 Cross ram info

As I recall, they tested the STR on the test car before Dianna made a race car out of it. You would have to find the first article. It may have been the June 1970 Hot Rod magazine?

http://www.ebay.com/itm/HOT-ROD-MAGA...item4d241524f1
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