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chevyLUVer16
 Post subject: roller cams
PostPosted: Thu Sep 13, 2007 9:59 am 
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Joined: Sun Dec 17, 2006 1:52 am
Posts: 98
Location: Arkansas
I'm experimenting with a roller cam for the first time...it's out of a 305 tbi engine and i got lifters and cam and hold downs ect... was wondering lift specs on this cam... Also, I know it aint a good idea, but was wondering what happens when these lifters are ran with a large aftermarket hydraulic cam? (non roller?) Im assuming it cant be done for some reason, but just wanted to ask why or, most likely, why not... sometimes a logical answer is better than a simple no, know what I mean??
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mytmouz
 Post subject:
PostPosted: Thu Sep 13, 2007 1:07 pm 
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Location: Pelahatchie, MS
You can run the factory rollers on an aftermarket roller cam, as long as it isn't a small base circle. If you compare the lobe profile of a roller versus non roller cam, the non roller has a sharper ramp. The roller will lose contact with the lobe at speed. Not good.

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hotrod80
 Post subject:
PostPosted: Thu Sep 13, 2007 5:14 pm 
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Also small base circle allows the roller lifter to drop to far into the bore . Also you would be giving away effective duration that is the main benefit of having a roller .
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chevyLUVer16
 Post subject:
PostPosted: Fri Sep 14, 2007 9:55 am 
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alright, thanks for the help guys...one last thing...how would the stock roller cam perform in the 305 tbi engine versus a stock non roller cam?
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mytmouz
 Post subject:
PostPosted: Fri Sep 14, 2007 12:35 pm 
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Most of the benefit with the factory rollers is due to less friction. The specs are pretty similar.

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