408 4x4 build

MRL Performance said

I think your heading in the right direction with this build 4X4, but i would change a few things just a little. The cam is a bit on the big side for what your after. So dial it back a bit. Hughes cams are ok, but I have made more torque with the Voodoo cams over any other of the same size(apples to apples). They just wrok. A 60403 will get you a ton of torque and still make good power, have a good idle. But if Hughes will do a swap for you(no extra $), I would go with their 2832 cam.

On the bottom end, Stay away from the Eagle I beam rods, spend a few $ more and go with the SCAT 4340 I beam rods. Much better rod, and lighter/stronger than the 5140 Eagle rods.

The RHS heads are going to be just right, and I would run the 1.92 intake valve. You dont gain much from the 2.02 unless you port the heads and the 1.92 is less shrouded. For the $ spent to go to a 2.02, you wont see any real gain. Put that money in the rods.

Stock Magnum 360's had 9 to 1 compression

Click to expand...

So comparing the hughes HEH2832AL and the Lanati 60403... It seems the hughes has slightly less duration but a lot more lift than the voodoo. Is this because of the .904 lifter size profile. For rods I plan on scatt I beams and forged crank. I was goint to go cast but I might have future plans for this motor that may accede the limits for cast. I'm thinking some W-2 heads w/ a 671 blower in the "LONG" future or possibly a Turbo or Nitrous.

For valves, hughes flowed both 1.92 and 2.02, the flow numbers for the mild porting is from IMM Engines chart.

1.92 flow in/ex ($975)
.100 71/??
.200 113/89
.300 167/140
.400 216/175
.500 246/177

2.02 in/ex ($1150)
.100 73/?? (+2)
.200 136/89 (+5)
.300 192/140 (+25)
.400 231/175 (+15)
.500 251/177 (+5)

2.02 mild port job ($1395)
.100 69/58 (-2/?)
.200 141/119 (+28/+30)
.300 197/161 (+30/+19)
.400 241/184 (+25/+9)
.500 267/193 (+16/+16)
.550 271/195 (+??/+??)

For the money I save in a deep sump pan, I can gain 25-30cfm on the ex/in bellow .400 lift. Maybe 2.02 by them selves may not be worth it but lightly ported the numbers look intriguing. What cam would be a good match w/ these flow numbers. Would my current 237/242 or 60404 lunati work well. Can I get a custom grind w/ the same lift/dur as the 37/42 but with 110-112 lsa for idle vac. 108 is a lil aggresive for the street is it not. Whats the minimum like 12-14 to be safe. Engine Anilyzer estimated the 37/42 to pull 12.6 and thats a icl of 105.