[Steve C.]

Old Faithful intake lobe
Comp lobe 3122B:
289
236
160
.3800"
0.570" lift
( I've seen .3810" lobe lift stated but never confirmed with an actual cam card)

Comp QXI lobe 13451:
289
237
158
.3950"
0.593" lift

Harold Brookshire Design lobe number HR2353683 listed at Howards cams:
288
235
158
.3680"
0.552" lift

All similar, but more going on than can be evaluated just by looking at those numbers. Example the opening closing rates on each lobe design.
And would there be a significant difference in a dyno test between these lobes when matched up with the same exhaust lobe and with the same lobe separation.

"If you want to build a street motor with the most power without a sacrifice of idle and low speed qualities, then lift is the most important factor to maximize, not duration. The best suited cams are those that seek to maximize lift while only adding a minimal amount of duration."
David Vizard


The most important cam design parameters are the four timing events or equivalently the advance, intake and exhaust duration and lobe separation angle.
Once the four timing parameters are established, the cam should be designed for maximum lift.
A quick opening and closing cam will provide better low end performance than one that is slower opening.
Tilden Technologies

( Information provided in this post does not represent any endorsement. And unless specified it is not based on personal experience and is offered for general interest only )
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