54H vs. Zipper rs 575 cams

[COVSpringer08]

Mike can you tell me what would you see/feel between these to cams? andrews 54H vs. Zipper's 575. also thinking about woods tw-7h

08 fxstsse with SERT, D&D fatcat big bore quiet, EVO 49T clutch basket, and heads going to Baisley to be mildly ported and milled to 10:1:1

Thanks

[Mike]

All three have similar intake closing timing and so cylinder pressures will be similar. The gearing, cubic inches, bike model, compression and porting all favour a mid range cam. The longer duration and overlap of the RS 575 would be my choice. Still would recommend the Boarzilla (quiet baffle) vs the Fatcat.

[COVSpringer08]

The Boarzilla has 1-7/8 to 2" pipes where my fatcat has 1-3/4 to 1-7/8.. I think my muffler is the same as the Boarzilla. I will find out today and let you know want i find.

If i where to go with the Axtells clys. 4.060 bore would i have a 117? Would the rs575 still work? and change to the Boarzilla.

[Mike]

The Boarzilla muffler is larger.

The 4.060 bore wouold give 113 ci. 4.125 would give 117. Both require case boring. The 575 would work well but as motor size goes up, so too can cam timing and duration.