Andrews is releasing a new cam called the 57h it has the same specs as the 37h with a 560 lift. So if any of you guys with 103's are planing on the 37 on roids save your money and wait for the new 57h.

57H   18/38  100  236  .560  .184
         46/14  106  240  .560  .153

37h

         18/38  ...    236  .510  ,184

         46/14  ...    240   ,510  .148                                                                                                                                                                 

FYO
Its very similar to my woods 5-6 cams also . It Looks like a bagger cam with school bus type torque. Interested in any info on the cam if Steve gets back to you. It looks like the max comp would be  9.8 to 10.1.

TW5-6
17/37 .... 234 .575 .174
39/15 .... 234 575 .160

Yep from 05 up with beehive springs. Andrews grinds very mild lift & close speed into there grinds so they should work fine at 560 lift. I ran the Andrews 54h with 555 lift on stock heads for two years with no problems. I bounced that 103 motor off the 6200 limiter plenty of times with no valve flutter.

short duration with high lift's can give the old hyd lifter's a bit of a rattle ( ticking noise) on some , faster opening & closing ramp's , but andrews  are a very radial type cam & mostly kind on the vavle train  esp these day's ,

 a real twingle ,   if iv'e spelt that right  that i think i have is a sporty  that has had it's cam timing's  changed /index too  fire both front & rear clyinders  on the same revolution  @ the true 45deg's apart  so as  rear cly fires  after 45 deg's front fires the crank rotates  675 deg's then the rear fire's etc thats a real TWINGLE .      a   v-twin near single ,  2 clyinder ,     they tried these's in the early days on the flat tracks too get more traction,        eg in top gear she could fire power stroke  every telegraph lamp post as the old saying goe's , true ;     quite easy on any model  sporty from 1952 sidevalve K-model -  to modern  2012 ,          got too love the sportsters   the original    BIG-BANG                                                         even before the Mighty Mick Doohan

The original Puch Twingle :

physiology.usouthal.edu/restore/allstate.htm

 veryinteresting,    ( i have 2 x 2strokes twins but they are TZ250D & TZ350E, the 250 held Wayne Gardner's 1st lap record in 1977 @ Oran Pk,           the other the 350  has a Ron Toombes raced  motor in her ,  i brought off his race machanic peter cambell,