Re: Viggen heads on 9000 Aero??????? - Saab Performance Bulletin Board - Saabnet.com
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Re: Viggen heads on 9000 Aero???????
Posted by 900 Aero (G-9 / Lesco) [Email] (more from 900 Aero (G-9 / Lesco)) on Sat, 19 Feb 2005 22:00:31
In Reply to: Viggen heads on 9000 Aero???????, MTAERO
[Profile/Gallery]
, Sat, 19 Feb 2005 16:09:13
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Hi Gary, it's the 9000 Aero '94 up heads that flow better (on the intake side) than the mid year PN911935 9000 heads. The 9000 Aero and the Viggen have the same castings but in '99 Saab went from 7mm valve stems to 5mm. The valve springs are also different and of course the valve guides are different but have the same OD. We have flowed both, I can look up the spec's if you like but in stock form there was very little difference if I remember correctly. What we're doing that should however make a noticeable difference is a custom guide that tapers down to the smaller valve stem. Once we flow one with the new guides we'll know for sure! Take care, Dave
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