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Old 04-11-2012, 09:52 PM
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When do you NEED a billet camshaft?

Looking to equip my current SBC build with a retro-fit hydraulic roller camshaft. Lift will be under "0.600 at valve. Not 100% sure on the spring specs (still looking up that info) but they are the springs that came assembled on my AFR heads and are intended for a roller camshaft. My question is at what point (lift & spring pressure) do you need to special order a billet steel camshaft? I know that the standard mass produced roller camshafts (both retro-fit and current) are not billet steel and are insetad some sort of cast steel? I don't want to put it together with an off the shelf retro roller cam only to flatten a lobe.

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Keith

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Old 04-12-2012, 06:24 AM
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Highly aggressive cams, with high rocker ratios 1.7+ and springs with over 500lbs of open pressure, also small base circle cams. If the lift on your cam is under .600" chances are it will be fine. The only cams with moderate lift that need to extra strong are stock eliminator cams, and that is because of their crazy fast ramp openings. FWIW on a roller cam, the lifter will typically blow apart before the cam will fail. The weak link in a roller-cam valvetrain are the bearings in the lifter wheel, not the cam itself.
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Old 04-12-2012, 09:30 AM
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The cam bearings also get a pretty good workout.
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Old 04-12-2012, 10:10 AM
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Quote:
Originally Posted by 383SBC
Looking to equip my current SBC build with a retro-fit hydraulic roller camshaft. Lift will be under "0.600 at valve. Not 100% sure on the spring specs (still looking up that info) but they are the springs that came assembled on my AFR heads and are intended for a roller camshaft. My question is at what point (lift & spring pressure) do you need to special order a billet steel camshaft? I know that the standard mass produced roller camshafts (both retro-fit and current) are not billet steel and are insetad some sort of cast steel? I don't want to put it together with an off the shelf retro roller cam only to flatten a lobe.

Thanks,
Keith

Call Jones Cams, not only will he spec you a better cam but he will also give it to you straight about cam materials. I'm guessing with .600" lift you'll want billet if you plan on seeing a lot of street miles. If thisis a weekend only car that will see less than 3000 miles a year then you'll probably be fine with a cast cam.

Regardless, call Mike at Jones cams. He'll be able to tell you more in 5 minutes than any tech from Comp can in 2 hours. His cams are about $25 more, BUT I have NEVER heard of anyone complaining about his cams and he does some work for some very serious racing programs all the way down to mild street stuff.
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Old 04-12-2012, 07:19 PM
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Quote:
Originally Posted by ap72
Call Jones Cams, not only will he spec you a better cam but he will also give it to you straight about cam materials. I'm guessing with .600" lift you'll want billet if you plan on seeing a lot of street miles. If thisis a weekend only car that will see less than 3000 miles a year then you'll probably be fine with a cast cam.

Regardless, call Mike at Jones cams. He'll be able to tell you more in 5 minutes than any tech from Comp can in 2 hours. His cams are about $25 more, BUT I have NEVER heard of anyone complaining about his cams and he does some work for some very serious racing programs all the way down to mild street stuff.
I don't know anything about Jones Cams, but I will also recommend anyone but Comp Cams to help you spec a cam. I had a series of emails and phone calls to their *cough TECH *cough line, what a joke. They might as well outsource those tech calls to India like every other company. I had an awesome experience ordering through LSMENG.com for my custom cam. Turnaround time was 18 days.
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