440 cam selection question

[jdavis2169]

Hi guys I have a 1976 440 truck motor stock low compression bottom end that I am putting Ported 906 heads, mopar single plane intake, 440 source 1.6 roller rockers, 1 7/8" primary full length headers, and a 750cfm holley 4150 carb. I am planning on doing a 3000 rpm stall I have a 3.23 sure grip 8 3/4 rear, and 275/60R15 rear tires I am looking at a Lunati voodoo part 10230702  with the 1.6 rockers will this cam fit without clearance pistons or cutting valve guides?

[Chryco Psycho]

Ths should work fine with  the 1.5 rockers but you will have to modify the valve guides in the head  & check piston clearance with 1.6 rockers ,why such a high stall with a mild cam ?

[jdavis2169]

Pretty new to building. I assumed the 1.6 rocker would make cam more aggressive and require the higher stall than advertised. I am am probably going to just buy pistons and go with a more aggressive cam. Was just trying to avoid tearing down the bottom end but should just do it right the first time..

[Chryco Psycho]

This is the way I build every engine , do it right the first time  use forged pistons , maybe stroke it to 512 CI , if you are going to cut corners do it on external parts that are easy to access & replace later on

[73restomod]

You can make a low comp motor run good, and the nice part is you can still run the cheap crap gas at pump. Rpm will be your enemy, with cast parts, so you will want a low duration cam, and to maximize lift. 1.6 ratio rockers will only add about .5-1 degree of duration increase, so your stall is a bit of overkill. Single planes intake only accentuate the already lower signal at the carb in the low and mid-range. You would be better off with an Eddy rpm dual plane and a 22-2500 rpm stall, the engine will make more power overall and the car will be faster especially with the gearing you have.  I have a 79 W100 with a LC 440 that the previous owner installed a 284PS, Holley Street Dominator SP intake, 1 7/8 headers, and a Holley carb. Suffice to say, it was a dog, until about 4k, than it would turn on and shortly thereafter it would shift. Burnouts, nope to that as well. So a 270 magnum cam I had lying around went in,  a MP high-rise Dual Plane when on. Now when I mat it 1st, 2 nd, & 3rd go up in smoke, and it will pin your ears back thru 1st and 2nd when it hooks, and pull clean to hundred in 3rd W/o hesitation. It transformed the truck, it drives better, gets better than the 8 mpg it used to get (11 now), it is a full time 4x4 with manual hubs, so that's a big plus all the way around in my book.