Mike Holmen

Zach, I see that you offer two different styles of 181/210 camshafts. A 105.5LSA and a 107 LSA ground camshaft? Whats the difference? Have you a ground two camshafts with different lobe centerline or just advanced/offset slightly? I also see that you also some info on camshaft centerline offset keys. Good info on the website.

I look forward to seeing the new 12v head come out soon, it will just fix so many design issues with the old design.

hamilton cams

the intakes were on the same centerlines on both designs. On the 105.5 the exhaust is retarded slightly which does two things. It opens later which gives the pressure in the cylinder longer to act on the piston before it is released to spool the charger, and on the closing side of the exhaust valve it allows more overlap which scavenges the cylinder and pulls in more fresh air into the cylinder at lower boost levels like cruising speed under 10psi. Slightly slower spool with greater engine efficiency. That cam works great if people know how to keep drive pressure in check. If not you end up pushing exhaust into the intake runner. Example would be a 62/65/12 pushing 60psi. It is a great cam if your head is out of your butt.

On the other hand, if you know you are going to push your chargers to the limit and you don't mind giving up a little cruising efficiency for better spool and less scavenging the 107 is your cam. We are trying to kind of bridge the gap between both schools of thought with our new cams.

Zach