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LD 340 Intake manifold VS. RPM Performer

11K views 9 replies 6 participants last post by  robx4406  
#1 ·
Has anybody tried the two different manifolds and know which one works better, i have both and i am not sure which one to use on my kids 340 the car will used for street and drag, ported heads, 500 lift cam 750 DP, ??? ??? ??? ??? any suggestions
 
#3 ·
.................Being that the LD340 was made in the 70s, it still holds it own among the best of them...The RPM will have a very slight edge as it also pulls from zero on up....if u up the cam the RPM will have more of an advantage.........if u didnt already have the RPM it would not b worth running out and buying 1...........kim.......
 
#5 ·
You also need to look at gear, stahl, and cam RPM range. You may need a single plane. Just things to keep in mind. For a street car with a mild cam and 3:55 or less. I would take the LD340. I have had 2 of them over the years. They work very good with a 2200 converter, 750 and 3:55 gears. I used the 68HP 340 cam. You can buy these form MP Performance.
 
#7 ·
For now the convertor will be stock, i am going to run the 3.55 because it will have 14 inch rally wheels with a 215 60 tire only 24 inches tall, the cam is 488 intake and 491 exhaust shifting at 6000, maybe more we will see
 
#8 ·
robx4406 said:
If you have an LD, run it. 

No intake, buy and air gap, unless you're like me and like to stealth the LD340 and fool people.  >:D
I gave up fooling people. Once I confirm to them that yes, it's a purple 68 Nova, but no, not a 454 - It's a 396.
 
#9 ·
At the time the RPM became available, Edelbrock had a question and answer forum in the net, so I asked them which is better, the LD340 or the RPM. They told, that if you already have hte LD340, there is no sence in converting to RPM. The difference (in performance) would be hard to notice.
 
#10 ·
speedymopars said:
robx4406 said:
If you have an LD, run it.

No intake, buy and air gap, unless you're like me and like to stealth the LD340 and fool people. >:D
I gave up fooling people. Once I confirm to them that yes, it's a purple 68 Nova, but no, not a 454 - It's a 396.
Hey nice Nova!!! Pulhair^*

I get that crap too.

I got the same response from Ede and a few other folks that the difference was negligible.