Olds 455 Cam Selection?

[starbuck]

i have an olds 455, 0.30 over TRW, all balanced, all oil mods have been done with C heads(big valve) street dominator intake, 900cfm holley etc..etc.. and i purchased a mondello jm-25-28 its 280/292 dur. .523 .544 lift 108 lode sep. and im looking for anyones opinion. is this too much cam?

[Wet Dream]

Way too much lift for stock rockers. The max lift you should go is no greater than .500

[Taylorman]

Way to much duration for the rpm's that the olds motor run. Get some adjustable rocker arms for that lift.
? Did Mondello's recommend that cam?

[starbuck]

the rockers have been changed to a 1.6 roller tip.. no i couldnt get a hold of anybody at mondello and i was cramped for time so i just bought it.. if assembled like so will it even run worth sh@$?? thanks for the info guys i just want it to be right.. and cam suggestions??

[Sleek-Jet]

Is that advertised duration or .050 duration???

[starbuck]

Is that advertised duration or .050 duration???
not sure the cam card reads as so
lift:
intake: .523
exhaust: .544
duration: 280/292
intake at .50 = 236
exhaust = 248
108 lobe sep.
rpm 2000 - 6500

[malcolm]

No, that's just advertised. It's probably a little big for ya. Don't let it spin too high for long. I'd check your retainer to guide (seal) clearance inside the spring. They can get too close above .500 lift.
Back when I was looking at Mondello's stuff, I always liked the looks of the JM-22-25-10. No reason to get a cam that goes to 6500 when the engine with come apart past 5500. I just bought a wimpy little Comp 280 for my 455 build.

[Sleek-Jet]

My 455 is topped with stock Ka heads and a Torker II intake. Compression probably in the 9:1 area.
Has a Lunati Bracket Master II grind 00080 in it.
Here's the spec:
Advertised Duration IN/EX: 280/290
Duration @.050 IN/EX: 214/224
Gross Valve Lift IN/EX: .472"/.496"
Lobe Sep Angle / Intake Ctr Line: 112/
Valve Lash IN/EX: Hyd/Hyd
RPM Range: 1800-4600

[Taylorman]

That cam is probably to big for the flow potential of stock C heads but it will run. For future reference, don't buy crap from Mondello's, they are jack asses that just want your money and will not help you with anything. If you are interested in other more helpful Olds vendors, i can give you someone.
You would be better off with a smaller cam that better fits those heads. Did you intall the cam yet?

[malcolm]

My 455 is topped with stock Ka heads and a Troker II intake. Compression probably in the 9:1 area.
Heh-heh, the guy I got my manifold from kept calling it a Toker. :D

[Wet Dream]

I can't find the card, but I'm pretty sure this is the one I got.
Brand: Competition Cams
Product Line: Competition Cams Magnum Hydraulic Camshafts
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000 RPM
Intake Duration at 050 inch Lift: 230
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 230 int./230 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 280
Advertised Duration: 280 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.490
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.490
Valve Lift with Factory Rocker Arm Ratio: 0.490 int./0.490 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash (in): 0.000
Exhaust Valve Lash (in): 0.000
Computer Controlled: No
Grind Number: OL 280H-10
Quantity: Sold individually.
Camshaft, Hydraulic Flat Tappet, Advertised Duration 280/280, Lift .490/.490, Oldsmobile, V8, Each
Granted, the efficiency of the cam profile is good to 6000, or 6500 in your case, but you aren't going to hit that in the Olds, unless you're on the trailer or in the air.
What did Mondello rape you for on that cam?

[Sleek-Jet]

Heh-heh, the guy I got my manifold from kept calling it a Toker. :D
hahaha... Troker II... I wonder if Vic ever planned it that way. :D
What I wouldn't give for a Perfomer RPM manifold for the BB Olds...

[LynnsJet]

I just sent you a PM about a cam.
L J

[HotDogz]

I run a CompCams advertised 292 duration w/110 cam lobe. @ .50 is 244/244 with a .518 lift. Motor has more snap since being rebuilt with new cam. Builder stated I was OK to 5600rpm. Needed new exhaust for the new motor tho.
p/u 400 rpm over old cam, 280 duration( also .060 over bore)
by the by I also use a torker manifold

[starbuck]

well the cam is already installed and my machine shop doesnt know about jet boats and said with the cam ill be ok, but its a little too much.. he was more worried about the idle being so radical that the engine will die on me flyin down the river..i think im gonna play with the cam a little bit and end up swappin it out with a more mild one..mondello got me for $300 thats cam, springs, retainers, and locks.:hammerhea

[TIMINATOR]

That is a happy cam, use it. I have built a lot of Olds motors and everybody under cams them. The oiling mods are important, but the drainback is a very big deal too. Big valves are good, but finish the job on them: fill the cross overs, weld the bridge, and port them before summer gets here. TIMINATOR 623-877-8553

[max]

I have that cam, it works great. Stock rocker arms, adjustable pushrods.
It idles good. The 108 lobe center is supposed to work better on a jetboat.
It is the largest mondello cam you can use with exhaust logs.

[v-drive]

That cam is probably to big for the flow potential of stock C heads but it will run. For future reference, don't buy crap from Mondello's, they are jack asses that just want your money and will not help you with anything. If you are interested in other more helpful Olds vendors, i can give you someone.
You would be better off with a smaller cam that better fits those heads. Did you intall the cam yet?
I never found this to be true about Mondello. Yes they are expensive but everytime I had a question they helped. v-drive

[Taylorman]

I never found this to be true about Mondello. Yes they are expensive but everytime I had a question they helped. v-drive
You must be the only one. On the realoldspower boards, everyone dislikes them and they all don't buy from them.

[Duane HTP]

Here is a camshaft for an Olds that we've had very good service out of over the years and it works with stock rockers.
Duration 280 Ex & In
Duration @ .050" In 232 Ex 232
Cam Lift In .323" Ex .323"
Valve Lift In .517" Ex .517"
Valve Lash In 0 Ex 0
Lobe Center 110 Deg.
Cam Only $106.00
Cam & Kit $372.00
Olds Stage II

[Taylorman]

Here is a camshaft for an Olds that we've had very good service out of over the years and it works with stock rockers.
Duration 280 Ex & In
Duration @ .050" In 232 Ex 232
Cam Lift In .323" Ex .323"
Valve Lift In .517" Ex .517"
Valve Lash In 0 Ex 0
Lobe Center 110 Deg.
Cam Only $106.00
Cam & Kit $372.00
Olds Stage II
Thats the cam i have in my boat. Duane, do you think this cam makes power over 5000 rpms? Im gonna do a little work to my heads and re cam my motor. I want 500 hp at 5000 rpms. Im thinking this cam peaks at over 5000 rpms. Whats your thoughts on this. I want to get as much out of my engine as i can without spinning it over 5000 rpms. My goal is to spin a ATJ AA impeller to 5000 rpms.

[396_WAYS_TO_SPIT]

I can't find the card, but I'm pretty sure this is the one I got.
Brand: Competition Cams
Product Line: Competition Cams Magnum Hydraulic Camshafts
Cam Style: Hydraulic flat tappet
Basic Operating RPM Range: 2,000-6,000 RPM
Intake Duration at 050 inch Lift: 230
Exhaust Duration at 050 inch Lift: 230
Duration at 050 inch Lift: 230 int./230 exh.
Advertised Intake Duration: 280
Advertised Exhaust Duration: 280
Advertised Duration: 280 int./280 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.490
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.490
Valve Lift with Factory Rocker Arm Ratio: 0.490 int./0.490 exh. lift
Lobe Separation (degrees): 110
Intake Valve Lash (in): 0.000
Exhaust Valve Lash (in): 0.000
Computer Controlled: No
Grind Number: OL 280H-10
Quantity: Sold individually.
Camshaft, Hydraulic Flat Tappet, Advertised Duration 280/280, Lift .490/.490, Oldsmobile, V8, Each
Granted, the efficiency of the cam profile is good to 6000, or 6500 in your case, but you aren't going to hit that in the Olds, unless you're on the trailer or in the air.
What did Mondello rape you for on that cam?
I ran that cam for a few years and it pulled hard. It pulled all the way through the powerband.
Just my 2 cents.....
396

[starbuck]

well i went ahead and installed the engle cam from mondello and put it all together.. i took it out yesterday and it seemed to run real strong. wont really know anything till i put some hours on it though. i first broke in the cam then changed my oil. ran it for probly 45min to an hour and my oil thinned out smelled of gasoline real strong. oil color got kinda dark metallic looking. then i changed it again and so far so good. im hoping that was cause the float in the carb was too high and gas was pouring into the intake. i also want to thank everyone that came forward and helped me with this. gonna post pics soon

[malcolm]

How's the idle sound? :)

[starbuck]

Idle sounds REAL good. sitting at idle it makes the boat and trailer start dancing. im very curious as to what kind of power it is making.

[n8dawg]

good luck, happy boating, and keep us "olds" guys posted. :cool:

[malcolm]

So n8, what'd you ever do with those logs? :p
Don't worry about it, I found a nice set of Glenwoods on Ebay. :)

[n8dawg]

I have completely forgotton all about them. Shoot, sorry. By the way if ya don't mine me askin, what did you pay for them ?

[malcolm]

I got them for $120 shipped. They're a little dinged up, but look like they'll work good.

[nice and easy]

I have this cam in my boat eng, currently pulls 4700 rpm with a AA agressor.