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daveh 10-14-2009 07:09 AM

Stock 340 intake or Edelbrock Performer RPM
Hey guys,

I'm finishing up assembling my engine and I want to get a new intake. It's a mild 340 in my 71 Dodge Challenger, 30 over, purple cam, forged crank, 2.02 1.94 heads, etc.

I have a stock intake. I am running a holley 650 double pumper and I am using the adapter plate on the stock intake for the square bore Holley. I want to get as much as I can out of the engine and don't know if the cost of the Performer RPM would be justified and be a better improvement. I am going with the Performer RPM because I think it will fit with the shaker hood. What do all of you guys think? Thanks for all of your help. Thanks


454C10 10-14-2009 07:37 AM

The stock intake will make more torque under 3500 rpm.

If the car is heavy (4000 lbs +) and has a low numeric gear (less than 3.00) then you will be better off with the stock intake.

daveh 10-14-2009 08:25 AM

It's a convertible

454C10 10-14-2009 08:31 AM

sounds like it is heavy.

automatic? what gear ratio? (highway gears?)

how does it run now?

how about a 440?

daveh 10-14-2009 09:09 AM

The car runs great but I am changing over to a shaker hood and I'm not certain the hood will shut. It's a Tremec TKO600 5 speed. It a posi 3:27 gear. Weight would be an issue for the intake the stock one is heavy compared to the RPM. Which I like. If it won't give me any gain then I won't do it but even if it's a little I will do it. Thanks again

454C10 10-14-2009 09:51 AM

it seems like you have enough gear for the little 340.

So I would change to the regular rpm intake. Don't get a rpm airgap, as they don't run well in cold climates. Your carb needs heat under it to run correctly. Just use the exhaust restrictor. Get a square flange intake.

what are the cam specs?

how is your ignition timing setup? initial, total mechanical, how much vacuum advance?

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