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Old 03-27-2011, 11:08 AM   #14
nickmckinney
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Join Date: Mar 2011
Location: Orlando
Posts: 380
Re: 4v cam specs: Stock, FRPP and Aftermarket

Here is an update for asymmetrical lobes from Bullet (not all the ones listed on the above chart are new style asymmetrical) Some of these lobes don't exist at the time I wrote this, but they will be available by the end of the week.

Intake and/or exhaust profiles

Duration@050/lift at valve assuming 1.80 ratio (the real ratio varies with lift)

206/400 - little bit more aggressive version of the 96-98 Cobra
215/425
214/500
219/500
224/500
229/500
215/525
220/525
225/525
230/525

Exhaust only (don't ask, Bullet is hardcore like that, their exhaust specific lobes are very differently shaped):
213/425
217/425
213/475
218/475
223/475
228/475
233/475

There are many other bigger ones all the way to 272 duration, but getting past whats here is pretty much race only RPM levels so I didn't see the need to list them.
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