Re: head work

["Chris DeLong" <green536@hotmail.com>]

No offense Riley, but why should you not deck the head to minimum spec? And 
what is minimum spec BTW? I have had heads decked to .060 and have no 
problems. AFAIK, the only problem that can be encountered by machining the 
head past .080 is that you might have to relocate the position of the 
tensioner stud. IMHO, machining the head more than .060 might rewuire more 
money and time than its worth for a DD. But other than that I would 
definitely machine it to .040 for a DD.

Chris DeLong
ICQ#45030867
Seattle, WA USA
'80 16V 'Rocco ragtop
'91 GLi 2.0 16V
'77 Rabbit 16V
'80 'Vert (parting out!)
'61 17 Window type II
'91 Vanagon
'78 Rabbit
'78 Rabbit (for sale)
'87 GTi 16V



>From: Riley McDowall <roog@telus.net>
>To: Paul Maione <paulmaione@videotron.ca>
>CC: scirocco-l@scirocco.org
>Subject: Re: head work
>Date: Fri, 28 Sep 2001 00:00:10 -0800
>
>At 7:34 PM -0400 9/27/01, Paul Maione wrote:
>>i got the TT heavy duty valve springs on the way, ARP studs,
>>it'll be up for a rebuild and 3 angle valve job. the guy
>>mentioned something about machining the guides (talkin
>>french too fast)
>
>May be too late here, but word on VW Vortex is that TT valve springs
>are prone to fail.  That spells very bad things for your cylinder
>head... if it's not too late, get Schrick ones instead.  Odds are
>you'll be ok with the TT, but you never know...
>
>As far as the valve guides go, your machinist is talking about
>cutting them down, or maybe even flush to the top of the ports.
>Usually there is 1/2 or 3/4" of exposed valve guide sticking down
>into the port.  Reducing it, or cutting it down flush, is one way to
>increase airflow into the combustion chamber.  The downside to doing
>this is accelerated wear to the guides themselves; that means you'll
>need to replace them more regularly.  Is it worth it?  Probably
>not... I left mine as-is.
>
>>i've seen a couple of people deck the heads to get
>>some more juice. what do people usually do to deck
>>the heads for 11:1 compression?
>
>Whatever you do, DON'T deck the head down to minimum height.  If for
>some reason your head needs to be resurfaced down the road, like if
>it warps or whatever, it'll already be down to minimum and they wont'
>be able to safely machine it.  Then your ported head is junk :P  Try
>a VW Motorsport head gasket instead - Owen Rabey has one and I know
>it's bumped his compression (you can tell just by listening to it
>idle) with no drawbacks.  I think he bailed off the list, so you'd
>have to email him direct to ask him about it...
>
>good luck paullie!!!
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