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will it need fly cutting

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Old Jun 27, 2007 | 12:03 PM
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234/240 .627 .641 112 lsa would that cam spec require fly cutting with a set of stock heads thanx
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Old Jun 27, 2007 | 12:04 PM
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With a set of stock heads, you shold be fine with that duration. I'm on the stock heads with my 242/242 .595/.617 112

I'm no expert though
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Old Jun 27, 2007 | 12:57 PM
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thanx. anyone else? looking to buy this cam need to know.
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Old Jun 27, 2007 | 01:14 PM
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i was told by vengeance racing that on an otherwise stock motor their vindicator cam only had .030 PTV clearance on the intake valve, and that was at .604 lift. in my opinion even .030 was way to close. any more lift than that is way to much without flycutting.

Wayne
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Old Jun 27, 2007 | 01:16 PM
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Initially it seems like you'll be OK with the stock heads...however it's awfully close.
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Old Jun 27, 2007 | 01:18 PM
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well what ive understood before lift doesnt effect your ptv but duration does. but i could be wrong.
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Old Jun 27, 2007 | 03:08 PM
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both affect PTV clearance. when in doubt, build the motor and clay it. if it's too close, time to flycut. .100 is nice, but i personally wouldn't go less than .80. everybody has a different answer, it's all up to you how close you consider too close.

Wayne
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Old Jun 27, 2007 | 03:33 PM
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well this is going into my bolt on motor and i dont want to buy it if it wont fit
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Old Jun 27, 2007 | 04:31 PM
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I would think that duration on a 112 would fit. It is however, a big cam. No way I would run it without checking PTV first. Then you have to decide what you are comfortable with.
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Old Jun 27, 2007 | 04:52 PM
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well the reason i ask is because i dont have the cam and i dont wanna buy it if it wont fit ive seen people fitting slightly bigger cams with not as much lift
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Old Jun 28, 2007 | 07:28 AM
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Originally Posted by bluenyghthawk
well what ive understood before lift doesnt effect your ptv but duration does. but i could be wrong.
Correct at those durations.

both affect PTV clearance. when in doubt, build the motor and clay it. if it's too close, time to flycut. .100 is nice, but i personally wouldn't go less than .80. everybody has a different answer, it's all up to you how close you consider too close.

Wayne
Not at these durations. The lift that affects PTV is not .050 lift but what is called "Tappet Lift" and those are two different things. Poeple in general confuse those.
i was told by vengeance racing that on an otherwise stock motor their vindicator cam only had .030 PTV clearance on the intake valve, and that was at .604 lift. in my opinion even .030 was way to close. any more lift than that is way to much without flycutting.

Wayne
.030 clearance is insane and only a Lunatic would run that on any "Street" setup.

.080/.100 (int/exht) are the accepted "safe" norms and that is not even on a hydraulic setup.
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