Performer RPM cam

[68Charger 440HP]

Hey guys, I am looking for a new cam for my 440. The car is a street mostly strip car. Right now i have the stock HP cam. (268/284 .450/.458) I was wondering if anyone has used the performer rpm camshaft. If so how did you like it? How was the performance? Also, what kind of torque converter is recommended? I currently have a 3000 stall speed converter. Is that enough? I am running the performer rpm intake, holley 850 dp, headers, msd, and soon to be 9.1:1 compression. Any other suggestions on high performance cams you have used is welcome. Thanks in advance.

[PRO]

with 9:1 comp you are limited to about 238* @.050 with an automatic,I like the MP 474/280 myself(P4452993).Havent run the Perf rpm in a mopar yet,it is just ok in 2 different sbc's........PRO....

[montrose ram]

You may want to check out www.hughesengines.com They offer their "Real Chrysler" cams based on the .904 mopar lifter which can give more "aggressive" profiles yet retain streetability. Good luck with your 440!

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[440 Jim]

From their web site, the specs for the Edelbrock Performer RPM cam for the big block Chrysler are:
300/308 duration at 0.004 tappet lift
238/246 at 0.050
0.480/0.495 lift (1.5 ratio)
110 deg lobe separation
105 deg installed center line
Timing at 0.050 lift:
Intake 14 BTC, 44 ABC
Exhaust 58 BBC, 8 ATC

IMHO, that 300 to 238 is not very agressive. My Lunati has 285 advertised and 235 at 0.050 with 0.507 lift on the intake. 295/245 and 0.534 on the exhaust, 110 LSA, 106 rec intake centerline.

[This message has been edited by 440 Jim (edited October 09, 2000).]

[451Mopar]

Check out the newer fast-rate-of-lift cams from Hughes Engines, or the Comp cams extream energy, or Crower cams.
Any of these will need stiffer valve springs, and chose them by their 0.050" duration, not advertised duration.

Other people have told me the Hughes cams work really good. I'm putting one in my 360 engine. If you call for a recomendation you will need to be very specific and make sure you are talking to the "right" guy (sorry forgot his name.) When I called one guy really was no help at all, and told me the cam I wanted wouldn't work with my combination (too much compression for mild cam), but he neglected the fact that I am at 6,000 ft altitude. He also din't know how to use their computer software to figure out the compression pressure for my altitude and said I woulf have to talk to the other guy.
The other guy was very helpful and know what he was doing. This is who you want to talk with when you call.

Anyone know the guys name?

[Mopar_Mudder]

Just thought it was intesting to look at the different rates of lift:

The Edlebrock had a 308 adv & 238 @ .050

440jim's Lunati has 285 adv & 235 @ .050

I just put in a roller cam 285 adv & 252 @ .050

Just thought it was interesting

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Mopar_Mudder
http://mopar.rockcrawler.com

[440 Jim]

It is hard to compare "advertised" duration, but if that is all we have then that is the best we can do.

Hughes cams advertised is at 0.008 tappet lift, at least they gives us the number, for example:

HE3844BL 283/291 @0.008, 238/244 @0.050, 0.536/0.540 lift (1.5)

I measured my Lunati at 0.004 then every 5 or 10 degrees and here is what I got:
#30306 284.7/295.6 @0.008, 235/245 @0.050, 0.507/0.534 lift (1.5)

So I think Lunati is using 0.008 too. They are very close with the Hughes a slight advantage in rate and total lift.

Anybody else measure any cams in this duration range? (220-260 @0.050)


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440 Jim
E-Body Fish

[This message has been edited by 440 Jim (edited October 10, 2000).]

[440 Jim]

Originally posted by 440 Jim:
From their web site, the specs for the Edelbrock Performer RPM cam for the big block Chrysler are:
300/308 duration at 0.004 tappet lift
238/246 at 0.050
0.480/0.495 lift (1.5 ratio)

Now since Edelbrock is advertising at 0.004 tappet lift, the advertised duration will be longer than Hughes or Lunati. It is hard to get good degree measurements right at ramp opening (0.004) but I estimate that both the Lunati and Hughes would be quite close to Edelbrocks number. However, the higher total lift implies better area under the curve for flow on the Lunati or Hughes.

Any opinions?



[This message has been edited by 440 Jim (edited October 11, 2000).]

[rumblefish360]

I think they have designed that cam with street manners in mind as opposed to the other cam listed in this thread.
Not that the others aren't streetable. I just think Edelbrock took a diff. approach to the package they put togther.

[451Mopar]

For Mudder's numbers I think Edelbrock specs their cams at 0.004" lift,
I'm not sure about Lunati, but probbly 0.006 to 0.008"
And most roller cams advertised rate is at 0.020".

Here is what I got on my very mild Hughes HE0914AL cam (advertised 252/261 @ 0.008", 208/215@0.050", 0.305"/0.313" lobe lift, 0.458"/0.488"@1.5:1 ratio):
Duration @ 0.002" = 277/292
Duration @ 0.004" = 266/277
Duration @ 0.006" = 259/270
Duration @ 0.008" = 255/263
Duration @ 0.010" = 250/258
Duration @ 0.020" = 234/241
Duration @ 0.050" = 209/216
Duration @ 0.100" = 180/187

Also, since the cam lobes have different ramps, it looks like the cam centerline (lobe seperation) moves around from 113 degrees to 108 degrees depending on the measurement height. The advertised LSA is 112, and at that is pretty close to what I saw between lifts of 0.004" to 0.010". At 0.050" the LSA (measured from the cam centerline meathod) was 110 degrees.
I think the lobe lift was about what was advertised, but I think there may have been a slight increase on the exhaust side.

I am using 1.6:1 rockers so the duration at 0.050" will look like the cam is about 2-3 degrees larger in duration and the lift will be 0.489"/0.501"!

Typing this I noticed that Hughes has a typo on their cam card. They mis-calculated the intake lift with 1.6:1 rockers at 0.470" lift.

[440 Jim]

451boy,
It looks like you took as many cam measurements as I did! I noticed a gentle final ramp on the closing end of the cam, say the last 0.010 or 0.015 inches of tappet lift. It was much gentler than the initial opening ramp. Otherwise the lobe apprears fairly symetric. Did you notice that on your Hughes?

The closing end caused my measurements to show a similar result as you stated regarding lobe separation at different lifts.

@0.050 int CL 107.125 ATC, exh CL 113.75 BTC, LSA 110.4
@0.020 int CL 107.5 ATC, exh CL 112.75 BTC, LSA 110.1
@0.008 int CL 112.45 ATC, exh CL 110.7 BTC, LSA 111.6
@0.004 int CL 120.125 ATC, exh CL 107.5, LSA 113.8

I realize that some measurement error exists. The published LSA is 110 degrees.

[Reddawgy]

I was reading and recently put a Magnum crate 360/300hp in my truck. Its nice so far, but pretty mild. Mopar doesn't have any mid range roller cams available. I was reading Hughes pages and "sounds" impressive enough. I e-mailed them about 2 of maybe 6 rollers THEY have for my motor! If this is correct, dang thats great. I gave them all my stats, ht,wt,color eyes, usage, 727, 3.55, ect, lets see what they say. I also ask for details on my spring lift ability with cams, cr, lifters and rods. I didn't ask for hp, should be a good test for thier techs to put humpty together again, so he can clean the kings clock.