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-   -   Cam and valvetrain longevity....??? low duration high lift... (https://www.offshoreonly.com/forums/general-q/341258-cam-valvetrain-longevity-low-duration-high-lift.html)

Full Force 10-02-2016 11:59 AM

Damn! Wtf

Originally Posted by MILD THUNDER (Post 4487287)
I get another text from an oso guy just now.

His 540, gets a 239/246 cam. He is running GM IRON HEADS. So, whether you have 325 afrs, or 305 afrs, or GM iron heads, you pretty much get the same exhaust duration, and within a deg or two of intake duration.

Sounds awesome. I need custom cams for my tailored application.


MILD THUNDER 10-02-2016 12:03 PM

Be interesting to build a database, on these "custom" cams.

Im sure everyone had to listen to speeches about area under the curve, exhaust port efficiency, rod angles, how tall decks suck becuase of the angles, and all the other reasons they need a custom tailored cam. And what they actually get, is a common cam everyone else is getting within a hair or two.

Craney 10-02-2016 12:31 PM

I would like to know what you guys think of my 496s from MK. Lobe seperation 113.1 duration 237.1 / 243.5 lift 663 / 654 305 AFR heads.

Full Force 10-02-2016 12:33 PM

Just my opinion but seems low duration for the lift, how many hours? Any signs of issues?

Originally Posted by Craney (Post 4487294)
I would like to know what you guys think of my 496s from MK. Lobe seperation 113.1 duration 237.1 / 243.5 lift 663 / 654 305 AFR heads.


Baja Rooster 10-02-2016 12:39 PM

I was talking to MK last year about a new cam as my ZZ502 unit is less than ideal, but the ordering process felt unnecessarily complicated so I just said forget it, and then the off the shelf cam thread popped up confirming that all of that extra trouble and expense wasn't worth it for me. It seems like I may of saved myself even a lot more trouble by leaving things alone.

getrdunn 10-02-2016 12:55 PM


Originally Posted by MILD THUNDER (Post 4487287)
I get another text from an oso guy just now.

His 540, gets a 239/246 cam. He is running GM IRON HEADS. So, whether you have 325 afrs, or 305 afrs, or GM iron heads, you pretty much get the same exhaust duration, and within a deg or two of intake duration.

Sounds awesome. I need custom cams for my tailored application.


Unreal. All needing this that and the other thing and hours on the phone many have spent to actually think what they were doing was time well spent to have cam tailored to their specific needs. Ah... OK. Not cool. I agree. If I had to guess valve timing events are all with a degree or two of opening and closing also. Wtf

buck35 10-02-2016 12:59 PM


Originally Posted by getrdunn (Post 4487304)
Unreal. All needing this that and the other thing and hours on the phone many have spent to actually think what they were doing was time well spent to have cam tailored to their specific needs. Ah... OK. Not cool. I agree. If I had to guess valve timing events are all with a degree or two of opening and closing also. Wtf

Bet he's been busy on the phone the last few days doin some splainin.:party-smiley-004:

Craney 10-02-2016 01:00 PM


Originally Posted by Full Force (Post 4487295)
Just my opinion but seems low duration for the lift, how many hours? Any signs of issues?

No issues yet, not many hrs. maybe 10.

Full Force 10-02-2016 01:07 PM

Still deciding if he's gonna get email with my pics, I would bet my life he's seen this thread, and still no response so it's most likely wasting my time...

Originally Posted by buck35 (Post 4487306)
Bet he's been busy on the phone the last few days doin some splainin.:party-smiley-004:


Full Force 10-02-2016 01:11 PM

1 Attachment(s)
Not any action since 2015... About the time things went public [ATTACH=CONFIG]559952[/ATTACH]


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