Previous Thread
Next Thread
Print Thread
Edelbrock STR 12 340 intake. #881479
12/16/10 02:04 AM
12/16/10 02:04 AM
Joined: Dec 2004
Posts: 275
Ont Canada.
H
Hardcharger65 Offline OP
enthusiast
Hardcharger65  Offline OP
enthusiast
H

Joined: Dec 2004
Posts: 275
Ont Canada.
Id like to find out if anyone on Mopats is running a STR 12 crossram on their 340 to find out how it works. Ive been told by many people that they never worked right due to a bad design flaw . Unburned gas sits in the intake and has a tendancy to blow up and damage the lid cracking it on start up . Is this true ?. its a cool looking manifold and seldom seen on 340s. Any info on this intake would be helpfull id like the good and the bad on this cool peice how it works if it can be modified to be reliable etc, thanks Moparts for the post its a great site.

Re: Edelbrock STR 12 340 intake. [Re: Hardcharger65] #881480
12/16/10 02:15 AM
12/16/10 02:15 AM
Joined: Jan 2003
Posts: 42,707
Spokane Washington
ScottSmith_Harms Online content
Mr Wizzard
ScottSmith_Harms  Online Content
Mr Wizzard

Joined: Jan 2003
Posts: 42,707
Spokane Washington
LAR414 has one on his 67 Dart, he modified it a small amount and claims that it runs great. He'll post on this I'm sure.

Re: Edelbrock STR 12 340 intake. [Re: ScottSmith_Harms] #881481
12/16/10 09:23 AM
12/16/10 09:23 AM
Joined: Jan 2004
Posts: 834
Pittsburgh, Pa
J
Jeff_383 Offline
super stock
Jeff_383  Offline
super stock
J

Joined: Jan 2004
Posts: 834
Pittsburgh, Pa
I believe LAR_414 went back to a single plane and single 4bbl for now. Had a low speed bucking problem when he installed the 4 speed. Said he will put it back on and play some more once he fine tunes his shifting skills at the track with the single. Ran great, he said, with his auto. Looks killer too! He did have to do some popsicle stick tricks in the runners.

Re: Edelbrock STR 12 340 intake. [Re: Jeff_383] #881482
12/16/10 10:01 PM
12/16/10 10:01 PM
Joined: Jun 2004
Posts: 892
Tustin, CA
P
pishta Offline
super stock
pishta  Offline
super stock
P

Joined: Jun 2004
Posts: 892
Tustin, CA
I ran one. Worked fine, but I had a pretty mild 284/484 purple cam. I had a custom 1/4 AL plate dual 4 top and buckled it on first start up (my fault, crossed 2 spark plug wires) did a 3/8 single 4 top and worked fine. Softer than my Strip Dominator down low but beat it up top. No popsicle sticks in mine.

Re: Edelbrock STR 12 340 intake. [Re: pishta] #881483
12/16/10 10:03 PM
12/16/10 10:03 PM
Joined: Feb 2003
Posts: 21,299
Manitoba, Canada
DaytonaTurbo Offline
Too Many Posts
DaytonaTurbo  Offline
Too Many Posts

Joined: Feb 2003
Posts: 21,299
Manitoba, Canada
I thought there was some kind of pressure relief valve you could install on those intakes to vent the excess pressure? In the event of a backfire the pressure vents instead of killing your intake.

Re: Edelbrock STR 12 340 intake. [Re: DaytonaTurbo] #881484
12/16/10 10:08 PM
12/16/10 10:08 PM
Joined: Jan 2003
Posts: 42,707
Spokane Washington
ScottSmith_Harms Online content
Mr Wizzard
ScottSmith_Harms  Online Content
Mr Wizzard

Joined: Jan 2003
Posts: 42,707
Spokane Washington
Yes, you can install a pop off valve into them and prevent from breaking parts.

Re: Edelbrock STR 12 340 intake. [Re: ScottSmith_Harms] #881485
12/16/10 10:16 PM
12/16/10 10:16 PM
Joined: Jan 2003
Posts: 4,573
...gently down the stream
LAR_414 Offline
master
LAR_414  Offline
master

Joined: Jan 2003
Posts: 4,573
...gently down the stream
As Jeff said, I ran the single 4 over the summer to tune it up sweet as well as get used to my new Stick shift at the track. Got things pretty squared away. Got a better handle on my low speed bucking problem, and it's NOT the intake or carbs. More of a camshaft / ignition timing issue.

Anyways, I'm having fun making even more mods to my STR-12 and it will be on the car over the winter. It's going to run better and look even nicer. Re-doing linkage, routing of stuff, making spring loaded pop of valves.

Here's a pic of it from a couple years ago on my Dart

6361776-Dart4speed0001.jpg (2339 downloads)
Re: Edelbrock STR 12 340 intake. [Re: Hardcharger65] #881486
12/18/10 09:26 PM
12/18/10 09:26 PM
Joined: Feb 2008
Posts: 109
ohio
G
geol Offline
member
geol  Offline
member
G

Joined: Feb 2008
Posts: 109
ohio
I have a 440 with an edelbrock str 14. my engine builder did have some problems he described as puddling which he resolved by changing jets.It is a real vintage manifold,The end result for us was 460hp and 517 fp torque.

Re: Edelbrock STR 12 340 intake. [Re: geol] #881487
12/18/10 11:19 PM
12/18/10 11:19 PM
Joined: May 2004
Posts: 1,031
South Jersey
kruger Offline
Yours Too!
kruger  Offline
Yours Too!

Joined: May 2004
Posts: 1,031
South Jersey
Looks good polished,what did you use?

Re: Edelbrock STR 12 340 intake. [Re: kruger] #881488
12/18/10 11:43 PM
12/18/10 11:43 PM
Joined: Feb 2008
Posts: 109
ohio
G
geol Offline
member
geol  Offline
member
G

Joined: Feb 2008
Posts: 109
ohio
mothers.I also used an eastwood clear coat and baked it in my wife's oven.

Re: Edelbrock STR 12 340 intake. [Re: geol] #881489
12/18/10 11:54 PM
12/18/10 11:54 PM
Joined: Feb 2008
Posts: 109
ohio
G
geol Offline
member
geol  Offline
member
G

Joined: Feb 2008
Posts: 109
ohio
here's another pic...on the dyno

6365496-editedengine.JPG (685 downloads)






Powered by UBB.threads™ PHP Forum Software 7.7.1