Mechanical Flat Tappets || Mechanical Flat Tappets .875 || Mechanical Flat Tappets .904
Hydraulic Flat Tappets || Hydraulic Flat Tappets .875 || Hydraulic Flat Tappets .904
Hydraulic Roller Tappets || Mechanical Roller Tappets || Bullet Home || Masters Home
Download a text version of the Master List
The information in this list is given as a general guideline only.
Please call Bullet Cams at 662-893-5670 and speak with one of our
consultants to determine if a particular lobe is suitable for your
application.
If you don't see what you need, give us a call. There are more profiles
available that are not listed, especially of the overhead cam variety.
We also specialize in doing custom grinds with a short lead time.
Master Prefix explanation:
- F - Mechanical flat tappet profile. Designed for a Chevrolet
size tappet (.842"). Can be used with larger tappets, such
as Ford (.875") or Chrysler (.904").
- FC - Mechanical flat tappet profile. Designed for a Chrysler
size tappet (.904"). Do not use on smaller tappets.
- FF - Mechanical flat tappet profile. Designed for a Ford size
tappet (.875"). Can be used with larger tappets, such as
Chrysler (.904"), but NOT with a Chevrolet tappet (.842").
- H - Hydraulic flat tappet profile. Designed for a Chevrolet
size tappet (.842"). Can be used with larger tappets, such
as Ford (.875") or Chrysler (.904").
- HC - Hydraulic flat tappet profile. Designed for a Chrysler
size tappet (.904"). Do not use on smaller tappets.
- HF - Hydraulic flat tappet profile. Designed for a Ford size
tappet (.875"). Can be used with larger tappets, such as
Chrysler (.904"), but NOT with a Chevrolet tappet (.842").
- HR - Hydraulic Roller tappet profiles.
- R - Mechanical Roller tappet profiles.
Lobe Type explanation:
- The first letter is either "C" for a conventional shaped nose
on the lobe, or "D" for a dwell nose. Dwell lobes are often
used when there is a lift rule, such as NHRA stock classes.
Dwell lobes are usually not well suited for higher RPM applications.
- The second letter is either "R" (RPM) for lobes suited for higher
RPM applications or motors with numerically high rocker ratios,
or "T" (Torque)for lobes suited for lower RPM or motors with
numerically low rocker ratios.
- The third letter is either "S" for symmetrical lobes (opening
and closing ramps the same), or "A" for asymmetrical lobes
(opening and closing ramps different). Asymmetrical lobes usually
have a slower closing rate to help prevent valve bounce.
Valve lash numbers are given at the lobe and have to be multiplied by the
rocker ratio to give the valve lash at the valve. Lobe lash numbers of
less than .012" are considered "tight lash" and tend to be more aggressive
lobes.