Thumper

XE 274 H 274 230 .487 110lca not more area UD Harold big brother to XE268

Click to expand...

I thought this was cleared up on the B body forum.

Harold did not design the Comp XE or the XE/HL lobes.

People that buy Thumpr style cams aren’t looking for fast rate cams with short seat timing that provide better idle characteristics.

They want the long seat timing and the rough idle.
That is afterall, the primary attraction for these cams.

The fact that these cams use smooth lobes with moderate lifts and can run lower springs loads is just a bonus.