Cam duration question

[Dartvader440gt]

My Dart restoration is coming along great. Getting ready to do some assembly finally. Now I bought this car way back in 2003. We are going through the 440. We are pulling the cam and going to install new cam and lifters.
The cam coming out is the
B/RB 361-440, 284/484 Hyd Flat Tappet

.484" / .484" Lift. 241/241 Duration @ .050" 108 + 0 L/C

One Bolt Pattern

Street / Strip

The one I can get from Mancini racing is
B/RB 361-440, 284/484 Hyd Flat Tappet

.484" / .484" Lift. 239/239 Duration @ .050" 108 + 0 L/C

One Bolt Pattern

Street / Strip

Is there a big difference in the duration going from 241 down to 239?

 

[OldmanRick]

Not at all...your good

 

[Dartvader440gt]

Not at all...your good

Thank you. I'll be ordering it then and move forward with my restoration.

 

[RustyRatRod]

My Dart restoration is coming along great. Getting ready to do some assembly finally. Now I bought this car way back in 2003. We are going through the 440. We are pulling the cam and going to install new cam and lifters.
The cam coming out is the
B/RB 361-440, 284/484 Hyd Flat Tappet

.484" / .484" Lift. 241/241 Duration @ .050" 108 + 0 L/C

One Bolt Pattern

Street / Strip

The one I can get from Mancini racing is
B/RB 361-440, 284/484 Hyd Flat Tappet

.484" / .484" Lift. 239/239 Duration @ .050" 108 + 0 L/C

One Bolt Pattern

Street / Strip

Is there a big difference in the duration going from 241 down to 239?

3 degrees.

 

[273]

Not at 0.050" probably similar depending how fast the ramps are if there a lift at .200" spec would tell you more but doubt there's much of a difference.

 

[Bewy]

That cam is going to have a lumpy idle, low idle vacuum. Carb & ign timing will have to be 'tuned' to work with it. If you are just building a cruiser, there are better cams to choose from.

Read this warning from Erson cams:

 

[Oldmanmopar]

Do your self a favor and get a mechanical cam. Many issues with the new hydraulic lifters.

 

[BSB67]

If that’s what you want, you’ll be fine.

The original 284 didn’t measure 241 at 0.050”.

 

[Dartvader440gt]

Do your self a favor and get a mechanical cam. Many issues with the new hydraulic lifters.

What are the issues? I'm unaware of this? And if so, what the mechanical equivalent?

 

[Vertex_Jeff]

My last 2 engine builds, I called the cam company I went with, and tol them about my combo, and what I was going to do with it. They then provided a cusotm grind for my appication. THEN, I called a converter company and gave them combo and cam specs, and had a custom converter made for my application.