Offshoreonly.com - New cam setup

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Offshoreonly.com (https://www.offshoreonly.com/forums/)

- General Q & A (https://www.offshoreonly.com/forums/general-q-20/)

- - New cam setup (https://www.offshoreonly.com/forums/general-q/358132-new-cam-setup.html)

Ryan00TJ

12-16-2018 05:41 PM

Quote:

Originally Posted by Griff (Post 4664041)

You should be fine. The risers have a tall bend, so reversion should not be a problem

I agree. Yet to remove all doubt, idle for 5 mins and remove a riser. Look down into the exhaust manifold. For better or worse your question will be answered.

ICDEDPPL

12-16-2018 09:10 PM

Quote:

Originally Posted by f_inscreenname (Post 4664057)

I'm running Merc 496 Aluminum exhaust with a 288/294, Lift .585/.610, 112 L/S cam. No issues.

http://supernova19.com/11c780e00.jpg

@.050??
That is a lot of duration for that amount of lift. Hows the valve train like those ramps? Damn

f_inscreenname

12-17-2018 12:42 AM

This is my mark IV, 454, stroked and roller'ed to a 496. I have to say I didn't always build winners but I seemed to hit it right with this one. No reversion issues. Has a bit of a lope during idle but besides that.... Most everything is off the shelf. Open 118 heads but use +18 dome pistons making it about 9.5 to 1 so its even good with pump gas.
Build sheet >>>> http://www.supernova19.com/current_b...nova19_com.htm

hogie roll

12-17-2018 06:21 AM

Quote:

Originally Posted by f_inscreenname (Post 4664130)

this is my mark iv, 454, stroked and roller'ed to a 496. I have to say i didn't always build winners but i seemed to hit it right with this one. No reversion issues. Has a bit of a lope during idle but besides that.... Most everything is off the shelf. Open 118 heads but use +18 dome pistons making it about 9.5 to 1 so its even good with pump gas.
Build sheet >>>> Current Build Sheet SuperNova19.com

231/235 112

Camalot

12-17-2018 06:33 AM

Quote:

Originally Posted by SB (Post 4664076)

If one is measured at .004" and another at .006" you can't compare seat duration easily.

Edit: Also, I see f_inscreenname pic above has S pipes. These help stave off exhaust water reversion also.

Yeah I did see the S pipes after I posted and can see how they would help with reversion....good to know for future reference!

Griff

12-17-2018 12:14 PM

Quote:

Originally Posted by ICDEDPPL

@.050??
That is a lot of duration for that amount of lift. Hows the valve train like those ramps? Damn

Its a hyd flat tappet cam and the numbers are similar to the Crane 420/525SC cam

Smoke eater

12-17-2018 02:26 PM

Are you guys thinking this is to much cam?

getrdunn

12-17-2018 02:56 PM

Quote:

Originally Posted by Smoke eater (Post 4664193)

Are you guys thinking this is to much cam?

You'll be fine like Griff said. Very similar to the 454/420 cam. I ran that cam in a rather stock 454/365 mag single engine boat and picked up 3 mph if I remember correctly. Been years however was a worthy swap running stock heads and exhaust.

GPM	12-17-2018 03:38 PM

http://supernova19.com/11c780e00.jpgThese elbows look like they would dump water in the motor every time you slow down.

getrdunn

12-17-2018 05:49 PM

Those aren't the ones in question though. Regardless just don't slow down. Hah.

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