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Crow VTKAU valve springs for AU 

 

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 Post subject: Crow VTKAU valve springs for AU
Posted: Sat Mar 10, 2012 10:46 pm 
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looking at the crow valve springs and it mentions that the VTKAU springs require the head to be machined...

what exactly is the issue..where / what needs to be machined?


E series
7332-12 1.820" 115 275, Retainer: 11700-12
7333-12 1.820" 140 305, Retainer: 11700-12

AU

VTKAU* 1.820" 125 285, Retainer: 11740-12, Collets: Stock
VTKAU-R* 1.82” 150 310, Retainer: 11740-12 Collets: Stock, Spring seat SS1456
* require machining.

 

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 Post subject: Re: Crow VTKAU valve springs for AU
Posted: Sat Mar 10, 2012 11:18 pm 
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Have a look at this thread:

http://www.boostedfalcon.net/viewtopic.php?f=3&t=7390&start=480&sid=04a36988b574e8dd7cbb510c965c4156

Basically to get the proper installed height of the spring, you should machine the step and use the supplied shim.

 

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 Post subject: Re: Crow VTKAU valve springs for AU
Posted: Sun Mar 11, 2012 12:06 am 
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yeah some good stuff in that thread..

im confused but, he was running the VTKAU-R which are different to the VTKAU... the "-R" ones come with shims, the normal ones dont...also why is this not required on EF heads, theyve got the same step also...

 

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 Post subject: Re: Crow VTKAU valve springs for AU
Posted: Wed Mar 21, 2012 8:21 pm 
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for the benefit of others wondering here is the info I got directly from john at crow cams..

VTKAU = Single spring with damper, same style as EA - EF, uses stock valve stem seal with retainer to suit metric (7mm) valve 125Lb@1.82 IH...

VTKAU-R = double spring (actually a cleveland spring), needs machining to suit the inner spring. will also need a positive stop style seal on the guide..150Lb@1.82IH... approx $30 more than plain VTKAU

 

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 Post subject: Re: Crow VTKAU valve springs for AU
Posted: Wed Mar 21, 2012 11:28 pm 
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gogetta wrote:

VTKAU-R = double spring (actually a cleveland spring), needs machining to suit the inner spring. will also need a positive stop style seal on the guide..150Lb@1.82IH... approx $30 more than plain VTKAU


I could this with out machining.
Atomic retainers and cranecams big block chev spring.

 

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