sportster upgrades Harley Engine Discuss sportster upgrades in the Harley Tech & Harley How-to forums; I have a 98 883 that has been upgraded to a 1200, with screaminging eagle heads and cams. I also have a single fire ignition. The upgrades have pushed my ...

[streek]

I have a 98 883 that has been upgraded to a 1200, with screaminging eagle heads and cams. I also have a single fire ignition. The upgrades have pushed my dyno HP to 87, and my torgue to 74ftpds. I wish to upgrade to adjustable pushrods and roller tappets. Whats the best brand and (or) the best way to do this. I'm not trying to increase hp, just to make engine more efficient. Thanks in advance for any help. Streek

[PeterV]

Your bike has roller lifters in it already.
Adjustable pushrods may turn out to be less efficient that one piece depending on adjustment.

4 valve heads are more efficient.
Overhead cams (and w...w...w...a...wa...water cooled blocks) are more efficient.
Harleys, except the VRods, have neither, (although there are 4 valve heads out there
You, like the rest of us, is dealing with old age engine design with these twins.
You can only go so far with a pushrod valvetrain and air cooling.

OTOH, a supercharger.......