Thumper

I left just off before the 280 Purple Plus
ThumperSBM 279/296 227/241 142/149 .486/473 107 BBM AMC CRS int & ex/ 36-63 76-41 ... 77 overlap

Purple Plus280/287 233/240 148 .474-.474 7 degree in/ex spread note 6 bigger at .050 and .200 and than the Thumper
Rattler 281 227 .480 Howard .842 lobes

XE279-HL 279 235 153 .356 .534 same intake duration as Thumpette but 8 more at .050 and 11 more at .200

Howards 279 232 152 .357 .535 intake lobe

68 4 SPEED CAM
276/284 444/453 114 LCA 112 ICL LCA P3423044 68 340 MT
276/284 @.008 Mopar advertised
282 @.006 220 @.050 444 68 4speed intake lobe @.004
[email protected] note 13 degrees longer @.004 than at .008
Int open: 26° BTDC
Int close: 70° ABDC
Exh open: 78° BBDC
Exh close: 26° ATDC
Overlap: 52° Mopar degrees around .008
Per the 68 factory service manual... Thanks Krazykuda

Engle K58 282 230 148 ,343 ,514 [email protected] .006 my est big nose for great wear

THUMPER HR 283/303 227/241 513/498 107 SBM BBM AMC Olds HR
Magnum ??? 222/226 .464/464 110 not magnum 268/276 adv cam
Purple Plus 284 239 154 .323 ,485
XE285HL 285/297 242/247 .545 110LCS
Voodoo 284 242 .533
Bootlegger 285/312 240/252 515/515 10.5 cr 3:91 gear SBC
Voodoo 287 242 .533

Purple Plus .. 287 240 153 .316 .474
MP 280.474 287@,006 .474 almost the same folks

Thumper 287/305 235/249 158/165 .507/494 Mother Thumper
Bracket II 292 239 480 109 LCA Lunati Bracket Master see post 32
Lunati 298 232 .462 Lunati's version of 340 cam LMFAO


The catalog I'm looking at says Nostalga Plus/ Purple Plush but I see only PP lobes there- Nostalga Plus was .842 lobes
I'd certainly go for a Purple Plus over Thumper
Or I'd grab one of the other lobes listed and put the appropriate exhaust on it for my build at the appropriate timings
Even if someone wants the Thumper sound why give up so much at .200 That's power left on the table