STR 12 Cross ram info

1969A56 · 01-10-2017, 07:13 PM

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.

Myron Piatek · 01-11-2017, 07:37 PM

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.

1969A56 · 01-11-2017, 08:19 PM

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

340Cuda · 01-12-2017, 11:01 AM

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

1969A56 · 01-12-2017, 09:27 PM

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

340Cuda · 01-13-2017, 11:02 AM

Quote:

Originally Posted by 1969A56

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

James L Miller · 01-14-2017, 10:09 PM

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.

1969A56 · 01-15-2017, 03:19 AM

Thanks, I think that was a tunnel ram, but not a cross ram

House of Darts · 01-21-2017, 08:53 PM

It was a dual quad. Ran E/MP and D.

James L Miller · 07-11-2017, 09:04 AM

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

01-10-2017, 07:13 PM	#1
1969A56 Junior Member Join Date: Feb 2012 Location: High Bridge NJ Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	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.

01-11-2017, 07:37 PM	#2
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,542 Likes: 34 Liked 138 Times in 51 Posts	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. __________________ LOCOMOTION Racing

01-11-2017, 08:19 PM	#3
1969A56 Junior Member Join Date: Feb 2012 Location: High Bridge NJ Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	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

01-12-2017, 11:01 AM	#4
340Cuda VIP Member Join Date: Apr 2003 Location: Tulsa, Oklahoma Posts: 1,669 Likes: 3,849 Liked 800 Times in 337 Posts	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

01-12-2017, 09:27 PM	#5
1969A56 Junior Member Join Date: Feb 2012 Location: High Bridge NJ Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	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 10:28 PM.

01-14-2017, 10:09 PM	#7
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	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. __________________ Mopar 2 Ya!

01-15-2017, 03:19 AM	#8
1969A56 Junior Member Join Date: Feb 2012 Location: High Bridge NJ Posts: 7 Likes: 0 Liked 0 Times in 0 Posts	Re: STR 12 Cross ram info Thanks, I think that was a tunnel ram, but not a cross ram

01-21-2017, 08:53 PM	#9
House of Darts Member Join Date: Mar 2007 Posts: 346 Likes: 19 Liked 20 Times in 15 Posts	Re: STR 12 Cross ram info It was a dual quad. Ran E/MP and D.

07-11-2017, 09:04 AM	#10
James L Miller Member Join Date: Apr 2005 Posts: 494 Likes: 6 Liked 25 Times in 16 Posts	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 __________________ Mopar 2 Ya!