I have a 228/235 dur cam with a 106 LSA and I love the idle. I understand the 108 would be a *slight* bit broader in the power curve, but just for kicks, if I had this same cam in a 108, would I have a noticeable difference in idle quality (smoother?). I know this may seem rediculous to most of you but I love the wicked, top fuel dragster-type of idle, compared to the tamer 60s muscle car idle.

correct me if I am wrong cam guys...

106 will be a rougher idle, and your peak torque and HP may be a little higher, but the power band will be narrower.

The 108LSA will idle a little better, you may lose a little peak power, but your power band will be widened.

For a street driven motor I would say you deffinately need to be at a 108 LSA.

106 LSA is really meant for higher RPM engines IMO.

My cam is on a 106 and it is 2500-6500

Since you also plan to change the duration it's a mute point.

2* isn't going to make a huge difference.

shawn listen to my cars idle with the joe sherman cam. i would rather have that sound and the pull that cam has than the idle i had with the comp xe284 cam(which was a little nastier).

oh yeah one more thing. make sure you have some meat in the rear as traction will become a serious problem. i had 4:11's with 285/40/17's and i had traction issues. lol

my 106 makes power from 2,500-7,000 not exactly sure what the hp is below 3,000 because my converter flashed there on the dyno but it had over 300 RWTQ from 3,200 to 6,000 both my hp and tq were like 2 flat lines across the graph

Since you also plan to change the duration it's a mute point.

Actually I was using my cam as an example but when I change cams for a 383I will be then comparing the 234/242 108LSA (recommended by Reed) and the same 234/242 cam but with a 106LSA. So I wondered about idle difference in the LSA only.

here is a vid of 106 lsa now the car hadnt been started in 2 days so motor is cold and I kept the r's below 3,500 or so
http://i101.photobucket.com/albums/m53/Fast72SS/th_Idleindriveway.jpg (http://s101.photobucket.com/albums/m53/Fast72SS/?action=view&current=Idleindriveway.flv)

Actually I was using my cam as an example but when I change cams for a 383I will be then comparing the 234/242 108LSA (recommended by Reed) and the same 234/242 cam but with a 106LSA. So I wondered about idle difference in the LSA only.

If you want the Reed cam and its 20 year old HR technology then buy it and be happy. But if you want the best design using the latest lobe technology, you will inevitably end up at Comp Cams.

Joe Sherman has said several times that the best hydraulic roller lobes he has ever tested on the dyno to date -- and he builds a LOT of HR-cammed engines -- is the Comp XE series using the new XFI lobe masters. He said he used to use Isky rollers but they like many other smaller cam companies have not put the R&D into their cam designs in recent years and have considerably fallen behind Comp who is currently the industry leader. Joe said the difference between the Comp XFI HR roller profile and one identical ground from another company is anywhere upwards of 20+ HP difference on the dyno. After the EMC was over, he made another 20 HP on the dyno over the 604 HP of his winning EMC 365ci small block using a Comp HR vs. the Isky 234° HR grind he had used. After that Joe went exclusively with Comp products and he says he is making a lot more power out of his engines than he had previously with other cam companies. A direct quote from the Old Master: "I used Isky for years, but when I got plugged in with Comp, I would never go back. My regular little street engines picked up 20 to 30 HP, and when I do a freshenup, a cam change from Isky to Comp has showed up to a 55 HP increase."

If Joe can crank-out 523 ft/lbs torque and 540 HP from a 10:1 street pump gas 383 using iron heads with 1.94/1.50 valves, you have to know the camshaft profile has a heck of a lot to do with that. I would use that Comp 236°/242° HR cam and keep it on a 106° LSA. The tight LSA brings the power on hard and fast, while giving a staccato idle most guys like.

Concerning what Tommy said about the Beehive springs, they are a vital part of the package. Joe says he is still amazed at what they can do. He said on another forum he saw one engine gain 51 HP and pick up 600 RPM on the dyno from changing over to the Beehives.

Something to think about.

theres more factors involved that just the lsa here are 2 106* cams. one is in a 383 236/244 hydro roller sounds nasty joe sherman cam

http://i6.photobucket.com/albums/y217/lemanster/th_MVI_0162.jpg (http://s6.photobucket.com/albums/y217/lemanster/?action=view&current=MVI_0162.flv)

here is a 106 250/250* solid roller in my 420 and it sounds tame to me compared to above
http://i6.photobucket.com/albums/y217/lemanster/420%20SWAP/th_MVI_0317.jpg (http://s6.photobucket.com/albums/y217/lemanster/420%20SWAP/?action=view&current=MVI_0317.flv)



my point being cubes, cam duration and lift will play into how it sounds at idle. go for perfromance and not how it sounds. you would think the bottom cam would sound much nastier...it doesnt but man it scoots.

Yes, all of those variables matter... but every variable would be exactly the same except for LSA. I would have a 383 with 2 different cams that had the exact same duration and the exact same lift. I just wondered what the 108 would sound like compared the 106 (when all other variables stayed the same)
I know this is rediculous but *IF* there was a hypathetical senario where *IF* the 106 sounded alot nastier than the 108 but was a tenth slower in the quarter, I'd still go with the 106. I'd be a tenth slower but I'd sound a whole lot nastier. See, I don't race at any track, and I don't know that I'd ever see that .1 driving to and from car shows. I have more of a "show" car that still has fun on my way to and from the shows. If having a nasty idle that turns everyone heads in the parking lot would only cost me (a hypathetical) .1 then I'll pay the price. I kinda look at it like this... if all cars went a few tenths faster with only primer on the body... then I'm going to be a few tenths slower to have beautiful paint. Sounds like "all show and no go" but I don't think a .1 difference is "no go".

Silly as hell, I know. :rolleyes:

Yes, all of those variables matter... but every variable would be exactly the same except for LSA. I would have a 383 with 2 different cams that had the exact same duration and the exact same lift. I just wondered what the 108 would sound like compared the 106

Silly as hell, I know. :rolleyes:


shawn you talking to someone who has 106's in both there motors. lol i was just showing you the difference in sounds. the top will give you and idea of what the joe sherman cam sounds like minus the sidepipes.

It sounds like you've made up your own mind you just need to get a 106 LSA that is designed to work with your compression and you'll have the sound you desire and wont be sacrificing any performance probrably gain performance

67Lemanster,
Oh yea, I know. And thanks for all the help.


-Thank you all for the help! I love 106.:lush:

I'm gonna say it AGAIN here TOO! And you will get SOTA!!!

"Call UDHarold up here--------

"I work for Custom Camshaft Company, a division of Arrington Manufacturing.
I stay at my house in Senatobia, MS, and telecommute to work in Martinsville Va. My office phone is 662-301-1245, and so far I'm having to take my wife to work, she's a Staff Accountant in Memphis, so I'm not here before 9:00 AM CST or from 4:00 PM to 6:00 PM CST. I answer the phone when it rings, and have sold several cams to Team Chevelle members." ----------

and ask him for his recomendation!

And please say hello from old pdq67

pdq67

PS., Too many guys swear by Harold's cams is all!!!

I'm gonna say it AGAIN here TOO! And you will get SOTA!!!

"Call UDHarold up here--------

"I work for Custom Camshaft Company, a division of Arrington Manufacturing.
I stay at my house in Senatobia, MS, and telecommute to work in Martinsville Va. My office phone is 662-301-1245, and so far I'm having to take my wife to work, she's a Staff Accountant in Memphis, so I'm not here before 9:00 AM CST or from 4:00 PM to 6:00 PM CST. I answer the phone when it rings, and have sold several cams to Team Chevelle members." ----------

and ask him for his recomendation!

And please say hello from old pdq67

pdq67

PS., Too many guys swear by Harold's cams is all!!!


pdq, not to be a smart ass but this thing you have going with Harold Brookshire is bordering on the ridiculous. You post this same info every single time a guy asks a question and then post it again if you think the guy didn't get the message the first time. Do you actually have any personal experience running any of his stuff or are you just hoping if you post this same info here and on TC enough that he'll send you a free cam? :rolleyes: