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Discussion Starter #1
Engine:
4.3 x 4.390 bore and stroke
Mainly street, occaisional strip.

Edelbrock RPM heads, 95cc
Flat top pistons, so around 10.7 CR
Torker II
Edelbrock 800 carb
3.27 rear
C6, 2,500 stall
2,800 lb. car


What is your opinion on the Edelbrock RPM cam for this (234/244 & .566/.581 & 108 LSA).

Another one I am looking at is the Comp 292H. It looks similar.

Or what else should I consider..........?

Looking for good driveability, lumpy idle OK, no need for RPM to rev. above around 5,500.

This is a great site, and now a great new look!!

John
 

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I would consider it to be a fairly mild cam for a 521. Look for something with a little more duration @ .050" but with wider lobe seperation angle like 110*.

I also prefer a Holley to the Edelbrock (Carter). You could use a 900+ cfm carb.
 

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Im running the Ford Racing A443 cam which has some more lift and 112LSA with same dur as the edel cam in my 466. For a 521, you'd want something with a little more duration probably, hopefully scott will answer. Your carb could also be bigger.



BUT......... I ALWAYS SAY GET A CUSTOM CAM FROM NOW ON.......ED CURTIS, JAY ALLEN, BUDDY RAWLS.......ALL GOOD
 

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Ford C-460

The FRPP #M-6250-C460 is ideal for this application. It's the cam which they put in their NEW 514, (actually a 521"), street Cobra kit car engine.
 

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Re: Is this camshaft too aggressive for a "street"

Jdean said:
Engine:
4.3 x 4.390 bore and stroke
Mainly street, occaisional strip.

Edelbrock RPM heads, 95cc
Flat top pistons, so around 10.7 CR
Torker II
Edelbrock 800 carb
3.27 rear
C6, 2,500 stall
2,800 lb. car


What is your opinion on the Edelbrock RPM cam for this (234/244 & .566/.581 & 108 LSA).

Another one I am looking at is the Comp 292H. It looks similar.

Or what else should I consider..........?

Looking for good driveability, lumpy idle OK, no need for RPM to rev. above around 5,500.

This is a great site, and now a great new look!!

John

I do not recommend the RPM cam for any BBF...

A comp extreme energy cam # XE284H would be a great cam for the combo peaking at about 5,500 RPM. I would spec it 240/246 @ .050" lift. .584"/.588" lift on a tight 108 lobe sep.

When you add inches to an engine with a given set of heads you will gain midrange torque by adding some overlap via a tighter lobe sep angle. This is especially true if the heads are not ported. The out of the box edlebrock heads have a peak intake flow of about 323 cfm. Ported they will do 360.


8)
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Discussion Starter #6
Yeah, I will be looking for an 850 or 950 Holley/Demon later on. Since I just want to get to 5500, maybe the Edelbrock will get me by for a while.
 

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I have a Comp H270 with Rhodes lifters, and it idles and runs very smooth. the Rhodes lifters are the best for street use
 

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Fast bleed lifters such as the Rhodes are...

carey255 said:
I have a Comp H270 with Rhodes lifters, and it idles and runs very smooth. the Rhodes lifters are the best for street use

...designed for use with a combo that has too much cam duration for the static compression ratio. They bleed off and shorten duration at low RPM for a better idle and more low speed torque. If you use them with high compression you can end up with detonation issues due to increased low RPM cylinder pressure.

I have used them and found them to work well but they are noisey. When a cam grind is properly matched to the combo they are not needed.


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The XE284H is exactly as described above.I used one in a 502 and was worried it may be a little small but it is perfect for the street.
 

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Discussion Starter #10
What are opinions on using a XE284 type grind but solid lifter instead of hydraulic? I don't mind the noise or having to adjust every now and then if there is more power to be made with a given spec of cam.
 

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Discussion Starter #11
Thanks for the advice.

Based on feedback, I am going with a Crane 354561. Here are the specs:

296/300 Advertised
236/240 @ .050
.556/.563 lift (based on 1.71 ratio, I am using Harland Sharp, supposed to be more than 1.73)
110 LSA
 

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What about the Lunati 31605? did you look at it?

295/305 advertised
245/255 @ .050
.615/.622 lift (1.73 ratio)
110 LSA

This is what I'm gonna run in the 545.

:D
 

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Jdean said:
Thanks for the advice.

Based on feedback, I am going with a Crane 354561. Here are the specs:

296/300 Advertised
236/240 @ .050
.556/.563 lift (based on 1.71 ratio, I am using Harland Sharp, supposed to be more than 1.73)
110 LSA
I'm no cam expert but I ran a similar cam with just a little more lift on my 468 and it was plenty streetable. I'd say that's a mellow cam for a 521. The specs the BigBlockRanger has look a little better IMO.
 

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Now that I see you're looking for something a little smaller than the C460 FRPP cam, I'd prefer the FRPP #M-6250-A443; it has about the same specs as the Edelbrock except it's ground with 112* seperation.
The 8* less on overlap allows it to have a bit more streetable idle.
Personally though I'd still prefer the C460 cam.
 

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Randy...

Randy, you may have already posted it but I missed it. What are the specs on the C460 cam?? Thanks.
 

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Discussion Starter #16
Yes, I looked at the A433

But after I bought the Crane, otherwise it is very close to what I was looking for, but it was cheaper than the Crane. I also considered the Edelbrock RPM, but Scott Johnston no likey.

The manifold I must run for hood clearance dictated a lot of my choices....why build more engine than the intake can support well, so that is why the cam, heads, total cubic inch (521 vs. 545) came into play.

Plus, I am really trying to stay under .600 lift to go easy on the valve train, since on occaision I plan to drive several hundred miles at a time in this car (Cobra kit car), putting about 2,500 miles per year on it.

Here is the build info:

Edelbrock RPM heads (got a good deal, otherwise TFS Streets)
KB402 pistons with 22.5 Dish, .005 above deck
Block is decked .030, so about 10-1 compression, .035 quench
Crane cam as mentioned 296/300
1 7/8" full length headers
Holley 950 carb
Torker II
Melling HV pump
Eagle rods 6.8 BBC type and 4.3 crank

I take it to the engine dyno this week, hoping for 1 hp per cubic inch.
 

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C460 cam

FRPP #M-6250-C460 - 244*/254*@.050" - .340"/.354" lobe lift - .588"/.614" projected valve lift - 110* seperation - 106* intake centerline
 

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Discussion Starter #19
Preliminary dyno numbers

Just ran it for 30 minutes to break in the cam. No carb tuning until Monday, but here is what the first 3 pulls revealed:

505 ft. lbs. starting at 2,500 rpm
580 ftl. lbls max at 4,000
511 HP at 5,000

This is just a bit short of what I was hoping for, but maybe with the carb adjustments I can find another 10-15 horses. I was thinking more like 530 HP but at 5,300-5,400. But torque is about 15 higher than I would have predicted, so its not all bad.

I am sure the Torker II is costing me a few ponies on an engine with 521 cubes, but I need to stick with it for hood clearance. I will post if any improvements are found.
 

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Re: Is this camshaft too aggressive for a "street"

Jdean said:
Engine:
4.3 x 4.390 bore and stroke
Mainly street, occaisional strip.

Edelbrock RPM heads, 95cc
Flat top pistons, so around 10.7 CR
Torker II
Edelbrock 800 carb
3.27 rear
C6, 2,500 stall
2,800 lb. car


What is your opinion on the Edelbrock RPM cam for this (234/244 & .566/.581 & 108 LSA).

Another one I am looking at is the Comp 292H. It looks similar.

Or what else should I consider..........?

Looking for good driveability, lumpy idle OK, no need for RPM to rev. above around 5,500.

This is a great site, and now a great new look!!

I used a cam motion hyd. cam in my 502 inch with cj edelbrock heads 9.5 comp witha stealth intake in a 3500 pnd car with 370 gear 3500 coverter, went 11.10 123 mph
cam grind H2401-2462-12
@ .050 240 in-247 ex
adver. 292-298
lift in. .579 ex..588
112 lobe sep

i would use the lunati voodoo cam #61605 if i wanted a hyd cam
 
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