Mopar cam info, suggestions.

[Mark1972]

So I finally got around to calling Bullet Cams. He asked the usual questions and I filled him in on all the specs of the engine and car. His suggestion is below.
240/246 @ .050"
.510 lift
110 LSA
2200 stall
Would be on the edge of vacuum required, and canister may be needed. He said any pocket porting, and an eventual upgrade in intakes would only be positive, but that this cam would be fine with my current build. I called them because a few people have suggested it, and because they are literally the only company I haven't spoken to yet. Both the duration and lift seem quite high compared to any other cam that has been suggested. Am I missing something here?

 

[Curiousyellow71]

For making power it sounds about right. For running vac brakes with engine vac on 9.5:1 its 2 going 2 be marginal. So, I don't think your missing anything..too big. But that's why working with bullet is nice...they can make it the way you want it. Usually the idea behind a custom grind is getting the most out of your combo or meeting requirements, but it does cost more then off the shelf.
But, knowing what you've layed out for your build I'd have them grind a smaller cam then that.

 

[BSB67]

Based on the information that you have supplied in this thread's discussion, the Bullet recommendation is off the mark. It has too much duration. But without actually hearing the conversation between the two of you, it's hard to comment on their recommendation.

 

[Curiousyellow71]

For vac brakes on a pontiac we have ground a couple ud282/288 232/240 .5 lift from bullet.. A similar grind to a voodoo 704.
I actually like the 704 better in a 440 then the smaller cams..but needs more converter. When comparing 702 and 703.... 702 has wider 112 lsa and less duration. 703 has 110 lsa and more duration. It puts some of the timing events in the same place within a degree. IMO What is amounts to is a 702 idles better, makes less power then a 703..neither is a big cam in a 440. But power bands are not much different. 704 in a 440 is typically more in line with the vac brake street builds we usually do...but again needs more converter and rough idle....and perhaps more cam then your looking for.

The cam bullet recommended kind of sounds similiar to a 509 mopar cam to me widened to 110. More of a bruiser then a cruiser.

 

[Mebsuta]

So I finally got around to calling Bullet Cams. He asked the usual questions and I filled him in on all the specs of the engine and car. His suggestion is below.
240/246 @ .050"
.510 lift
110 LSA
2200 stall
Would be on the edge of vacuum required, and canister may be needed. He said any pocket porting, and an eventual upgrade in intakes would only be positive, but that this cam would be fine with my current build. I called them because a few people have suggested it, and because they are literally the only company I haven't spoken to yet. Both the duration and lift seem quite high compared to any other cam that has been suggested. Am I missing something here?

I'm missing something too if that's the weekend cruiser cam for a 440 Satellite with a 727 and 3.55. I know nothing, so I just used the original 383-440 HP cam (Speed Pro or Sealed Power CS-661, etc). I installed it in a parking lot 30 years ago and just let it be.

 

[Curiousyellow71]

Summit 6401 $89 cam mentioned idling in a 440

 

[Curiousyellow71]

703 voodoo in a 440

 

[PRHeads]

Based on the information that you have supplied in this thread's discussion, the Bullet recommendation is off the mark. It has too much duration. But without actually hearing the conversation between the two of you, it's hard to comment on their recommendation.

I totally agree with the first part...... but unless the OP gave Bullet different information about the combo than what’s posted here....... it seems like “a swing and a miss”.

Btw, 2200 stall would be less that what you’d get out of a typical factory 11” converter behind a decent 440.
Heck, a 12” might even be close to that.

But.......not with a [email protected] hyd cam.

 

[Mark1972]

Hey guys. The information listed at the very start of the thread is accurate, and is the same information given to all the camshaft companies I've spoken with. The only thing I have mentioned to them is that there may be an upgrade to the intake at some point, but that's it. I understand the question about the accuracy of the information given, especially when the Bullet recommendation was so much different than many of the others, but that was the cam option they told me would work best. when I get home from this out of town job next week, I will be sitting down with the engine builder and going over all options that will work best for me, and still allow growth with future upgrades.

 

[wyrmrider]

did you ever cc the heads and deck height and verify the compression
if you are going to be picky you might forget any thoughts of roller rockers and get some iron rockers and a solid cam
on the hyd cams i'd get a big circle on a big piece of paper and plot the advertised timing normalzed to .006 .050 s useless for what you are trying to do
incidently that crower I mentioned above was designed to have about the same intake duration (actually shorter)as a stock magnum cam but with .525.lift instead of stock
the 383>426 idles like a stocker but...

 

[66Satellite47]

Many of us know that the correct torque converter will "make" the performance combination. "Stall speed" is such an undefined term, very little value. A motor like the OP is talking about will want a converter with some moderately good "flash stall"(3500+/-) & good efficiency. The top aftermarket converter suppliers can match the converter to the camshaft/torque characteristics. I'd tell the cam guy what I want for torque, RPM, HP, cylinder head configuration, CR & let the converter match that. Give the cam guy "stock low perf", "stock hi perf", "aftermarket 10"", etc. My opinion.

 

[PRHeads]

Fundamentally I agree with the above post.
But...... if someone does try and combine a pretty tight converter with a [email protected] hyd cam, the chances are pretty slim that that’s going to provide very satisfactory vacuum for the brakes when it’s idling in gear....... being dragged down by that tight converter.
Even with the typical “10 inch” converter the vacuum would be marginal.

Hot street, street/strip car with more gear and manual brakes(or some means in assisting the vacuum)...... [email protected] is fine.

240/246-110 hyd cam in a 440:


240/246-110 hyd cam in a 455 Olds:

 

[66Satellite47]

Fundamentally I agree with the above post.
But...... if someone does try and combine a pretty tight converter with a [email protected] hyd cam, the chances are pretty slim that that’s going to provide very satisfactory vacuum for the brakes when it’s idling in gear....... being dragged down by that tight converter.
Even with the typical “10 inch” converter the vacuum would be marginal.

Hot street, street/strip car with more gear and manual brakes(or some means in assisting the vacuum)...... [email protected] is time.

240/246-110 hyd cam in a 455 Olds:

Ok, guess we're on the same page.

 

[Mark1972]

The winner in the camshaft sweepstakes was...
CompCams XE268H
268/280
224/[email protected]
.477/.480
110/106
1600-5800
After sitting down and discussing this today with the shop, it was the recommendation they made once I had decided to pocket port the heads, and figuring in the future intake upgrade. A stall of around 2000-2200 will likely go along with this as well. New lifters, timing chain of course, and springs will go in as well. Vacuum shouldn't be a concern, and now the shop can get it ordered and start putting the short block together. Just wanted to say thanks again for all the suggestions and advice.

 

[Sonny Black]

Sonny's Mopar Performance purple camshaft . ... Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 284/484....need at least a 391 rear..

 

[wyrmrider]

do what you want but the Comp version of the 268 slams the valves closed hard
the Lunati version is much improved the chevy version gives 25HP over the comp
and the Chrysler Voodoo version has a much fatter area under the curve
268/276; Duration @ .050 (Int/Exh): 226/234; Gross Valve Lift (Int/Exh): .494/.513; LSA
and no way do you need that 12 degree spread between intake and exhaust
I'd find a new shop
data on comparison is from UDHarold- not me

 

[Curiousyellow71]

Just a suggestion...with the 268xe shoot for 9.3:1.
IMO...you will be happier with it unless you want to run it on premium.

 

[wyrmrider]

what #44 said
Actually the 262 voodoo closes the intake within one degree of the 268 and has about the same lift. It's going to have more area under the curve
so pick on the rpm range and converter
Don't put a chevy cam in your MOPAR