408 Magnum New Build, Gutless of idle

rumblefish360 said

I think something is out of time.

But I would not build that engine combo.
Just, IMO...
Stock R/T heads? Some valve seat work and a bowl blending since your lifting the valve as high as you are.
To light on compression
The cam (depending on the rest of the drive train and vehicle weight) is 10* to large, at a min.
The 114 installed and the installed 112 is to wide. It looses cylinder pressure. The 114 should be @ 110 or 108, the installed centerline on a 106/104.
I myself would have moved to a roller rocker.

What is the trucks weight, intended usage, gear ratio & tire size, what trans and stall converter?

If this was for towing....
On the quick, I’d swap out camshafts.

Click to expand...

Truck is a 2000 1500 Ram
3:92 gears 33” tires
Factory 2000 rpm stall
Tried roller rockers but the geometry wasn’t favorable so went back to the factory rockers. Roller rockers can be added but I don’t think it’s a make or break right now.
Heads have a bowl blend, short turn work and have been surfaced with a fresh valve job that checked out on vacuum test.
Comp specd the cam entirely based on all the information they gave. Truck, weight, gears, tire size, stall, head flow etc. I questioned the 114 but they said it would allow the computer to function happily.

The best way I can describe it, is it literally feels like a shot of nitrous at 3000 rpm and higher. Below that it feels like I have 10000lbs behind me.

Factory rockers are 1.6
Heads are Mopar performance RT heads