Thumper

So let's look at some shorter lobes with more area

HRS 710461 273/ 277 226 .525 Garrett Ellison used for 9.5 340 110LCA 7104461
HR 274 274 ........ 224 .538 .573 w/ 1.6 110LCA Rumble used in 360
Howard est 268/276 206/208 434/434 113 in at 110 American Muscle is the standard 484 440 cam not the HP/Magnum Mopar adv 260/268


DC260 269 @.006 212 @.050 115@200 42@275 430 (34 ovlp) 113LCA P4286669 LA “-113 110icl early cam P4286669 284 @.004 single pattern
MP 260 [email protected] 221/[email protected] 430/450 110LCA P4452759AE later cam

Lunati 269/296 224/236 .485/.485 108 LCA 104ICL Bootllegger for SBC

Engle K56 274 224 149 .336 .504 I estimated the Engle (which Hughes used to sell) at .006 but it has 149 degrees @.200

XE 274 H 274 230 .487 110lca not more area (not UD Harold) big brother to XE268 by Billy Godbout

XE275HL 275/287 231/237 145/151 .525 110LCA IC 64 ABDC here we get a 145 @200 on the Intake and
comp gives us an Intake Close of 64 ABDC Moper suggested this one for a build
Not as big a split intake and exhaust as Thumper but still a bunch for modern heads with headers (IMHO)
Nostalga Plus 276 229 140 .312 .468 .842 minimum lobe not more area

Lunati 704 276/284 234/242 .513/.533 110LCA
Lunati 108 277/304 232/244 .500/.500 108LCA 104 ICL SBC Bootlegger

Howard 277/283 230/236 531/537 110 LCA
Lunati and Howard have less split than Comp HL, less overlap
all on 110 so intake close and overlap are in the same ballpark
-devil is in the details

340 cam 279 210 .429 2899206 intake @.006

318 Whiplash ??? 213 480 109 LCA

340 Whiplash ??? 223 550 107 LC

ThumperSBM 279/296 227/241 142/149 .486/473
36-63 76-41 ---77 overlap Intake closes 63 ABDC

so the intake closes about the same place as the 275 HL but the overlap???

Hughes HE2430AL 276/282 110/115comp/112pwr/Ica of 65*/50* E-overlap see post 36 Hughes advertised is 270/276 I adjusted to .006