New cam setup

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12-16-2018 | 05:41 PM

#11

Ryan00TJ

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Joined: Nov 2006

Posts: 1,313

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From: Tygart Lake, WV

Quote:

Originally Posted by Griff

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.

12-16-2018 | 09:10 PM

#12

ICDEDPPL

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Joined: Jun 2009

Posts: 9,973

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From: Chicago

Quote:

Originally Posted by f_inscreenname

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

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

12-17-2018 | 12:42 AM

#13

f_inscreenname

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Joined: Jan 2005

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From: Pasadena, MD

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

12-17-2018 | 06:21 AM

#14

hogie roll

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Joined: Jan 2006

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From: St. Pete Beach, FL

Quote:

Originally Posted by f_inscreenname

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

12-17-2018 | 06:33 AM

#15

Camalot

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Joined: Apr 2018

Posts: 134

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Quote:

Originally Posted by SB

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!

12-17-2018 | 12:14 PM

#16

Griff

Charter Member # 55

Joined: Oct 2000

Posts: 20,241

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From: Omaha/LOTO

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

12-17-2018 | 02:26 PM

#17

Smoke eater

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Joined: Jun 2018

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From: Burlington Wisconsin

Are you guys thinking this is to much cam?

12-17-2018 | 02:56 PM

#18

getrdunn

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Joined: Feb 2009

Posts: 8,356

Likes: 1,515

From: NW Michigan

Quote:

Originally Posted by Smoke eater

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.