I am trying to decide between a couple of cams and I am having a hard time. Its for a f250 that will be used as a daily driver and for towing. the specs of the engine are:

466CI big block
straight up timing.
D3VE heads - stock valves, exhaust ports cleaned up.
1 3/4 long tube headers.
Stock intake.
9.3:1 compression.
750 cfm qjet carb.
1.7 roller rockers.
3.5 inch y-pipe

The cams I am having a hard time choosing between are:

Comp XE256H flat tappet
RPM Range: 1000 - 5200
Valve timing: 0.006
Lobe Separation: 110 degrees
intake centerline: 106 degrees
Valve lash: HYD / HYD
Duration: 256 / 268
Duration @ .050 lift: 212 / 218
Valve lift: 0.487 / 0.493
Lobe Lift: 0.283 / 0.283

Crane 353901 Flat tappet
RPM Range: 1200 - 4800
Lobe Separation: 112
Duration: 260 / 272
Duration @ .050 lift: 204 / 216
Valve lift: 0.487 / 0.518

Crane 359331 Hydraulic roller
RPM Range: 800 - 4600
Lobe Separation: 112
Duration: 262 / 274
Duration @ .050 lift: 200 / 212
Valve lift: 0.532 / 0.568

Lunati 20340710 Hydraulic roller
Advertised Duration (Int/Exh): 262/270
Duration @ .050 (Int/Exh): 211/219
Gross Valve Lift (Int/Exh): .559/.559
LSA/ICL: 112/106
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1400-5400

Lunati 10340700 Flat tappet
Advertised Duration (Int/Exh): 250/256
Duration @ .050 (Int/Exh): 207/213
Gross Valve Lift (Int/Exh): .503/.535
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: Idle-5000


Lunati 10340701 flat tappet
Advertised Duration (Int/Exh): 256/262
Duration @ .050 (Int/Exh): 213/219
Gross Valve Lift (Int/Exh): .535/.540
LSA/ICL: 112/108
Valve Lash (Int/Exh): Hyd/Hyd
RPM Range: 1000-5500

Crane 359341 Hydraulic roller
RPM Range: 1400 - 5400
Lobe Separation: 112
Duration: 278 / 286
Duration @ .050 lift: 216 / 224
Valve lift: 0.556 / 0.580


Thanks for your help. If you have any other suggestions on other cams, let me know. Thanks.

 

I know it's 3 months late, but hopefully this is still helpful. I'm a lurker mostly but I've been seriously looking into having my engine rebuilt. Here are my numbers from my Dynomation-5. I'm not certain I've got all the input's 100%, but I've done my best to dig through the data and I think most are close.

466ci (.030 over)
Stock E7TE Heads, ported will be better.
Headers 1 3/4" Long
9.3:1 Compression
750CFM

Stock 460 Engine: 49hp@1000rpm, Max HP 268@3750, Max TQ 426@2500
Comp XE256H (overlap 42): 59hp@1000rpm, Max HP 336@4250, Max TQ 478@2500
Crane 353901 (overlap 42): 57hp@1000rpm, Max HP 344@4500, Max TQ 467@2500
Crane 359331 (overlap 44): 56hp@1000rpm, Max HP 349@4500, Max TQ 464@2500
Lunati 20340710 (overlap 42): 57hp@1000rpm, Max HP 343@4250, Max TQ 467@2500
Lunati 10340700 (overlap 29): 63hp@1000rpm, Max HP 330@4250, Max TQ 474@2500
Crane 359341 (overlap 58): 44hp@1000rpm, Max HP 360@4500, Max TQ 446 3500

Another one I've been considering (Hydraulic Flat):
Lunati 10340267: 61hp@1000rpm, Max HP 335@4250, Max TQ 475@2500

I like how the 20340710 from Lunati is looking myself, as it develops at 4250 around what most the others do at 4500. I don't expect to ever turn more than 4250 on my truck (or hardly ever even that). But most of those cams are very similar, so trade a little low end for top end.

1st gear is a granny, and with stock I feel plenty of power on the low end, so I think your better going for better top end.

The Crane 359341 makes the most HP, but even with the increased CR still less low end than stock. And it's a hotter cam than stock and has more overlap, which I've read my SD EFI system is sensitive to. You are carbed though so you have lot's of options.

Ignition is 22+4 per 1000RPM, so 26@1000 - 38@4000. I'm assuming that you'd need premium but I'm not that experienced and the software doesn't say.

Hope this helped. Maybe others will chime in. If you have Dynomation-5 I can attach the engine and cam files. Let me know if I can run anymore numbers for you.

Sincerley,
--Jem