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Old 05-02-2002, 06:23 PM   #1 (permalink)
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Edelbrock cam

The Performer RPM cam says that lower than stock rear gearing and high performance torque converter is necessary....Why is this? And it also says that 9.5 comp ratio is required and I do not know what compression I have. Was planning on putting RPM heads on too. Can the RPM heads and RPM intake be used on a standard Performer cam? How well with that match up?
Thanks...
Allan
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Old 05-02-2002, 07:24 PM   #2 (permalink)
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Edelbrock cam

Well..Edelbrock will probably tell you that it is a great match. From what I hear the RPM performer cam is not that good. But I am not speaking from experience. They tell you to change the t-converter because your low power is going to lope and you will need to turn up your idle. Once you turn up the RPMs to make up for the poor idle you are going to have to up your stall so the car kicks in at a good power range.
As for your compression, there is a good calculator on this site if you know what type of pistons you have. It shouldn't be too hard to calculate if you haven't replaced the stock pistons.

Just my .1$

[ This Message was edited by: duckie37 on 5/3/02 7:28am ]
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Old 05-02-2002, 10:46 PM   #3 (permalink)
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Edelbrock cam

Is the Performer RPM a big enough cam to have a lope at idle or is it smooth? I am putting one in my 351w and thought it had a smooth idle to it.
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Old 05-02-2002, 11:24 PM   #4 (permalink)
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Edelbrock cam

If you are talking about the edelbrock Performer RPM Cam #7182 then no. It is supposed to be a mild to rough idle.

Advertised duration: 290/300
Valve lift .496/.520
110 degrees

Now the Performer-plus #2182 has a smooth idle.
Advertised duration: 270/280
valve lift: .448/.472
112 degrees

But once again, I have never used either of them. So I can't speak out of experience.
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Old 05-02-2002, 11:30 PM   #5 (permalink)
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Edelbrock cam

What is the biggest cam without clearance problems that I could probably put in a bored .060 over 302?
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Old 05-03-2002, 08:23 PM   #6 (permalink)
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Edelbrock cam

I've got the RPM cam in my 289, I've got the idle set at 500 rpm's in gear and its a little rough, but not too bad.
It definately needs a stall converter and gears (my next projects).
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Old 05-03-2002, 09:28 PM   #7 (permalink)
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Edelbrock cam

You asked how big can you go on your cam, well it is not that simple. There are a several factors that go into cam selection. The RPM heads can only handel so much lift without changing the valvesprings (.575 I believe). I am not a cam guru so I will refrain from specific cam selection advice, but I run a .540 lift IN, .566 lift EX. cam with my Edelbrock RPM heads and it got me into the mid 12`s. I am makeing well over 300 HP at the tires now.
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Old 05-03-2002, 09:57 PM   #8 (permalink)
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Edelbrock cam

Well not being an expert or anything I'll see if this will explain why they (Edelbrock) recommend higher stall convertor. I believe it is because that particular cam will make maximum torque above the stall of the stock convertor and thus to get the most out of it they suggest a higher stall convertor. does that sound about right to you gurus ou there?
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