<VV> Engine building - valve spring installed height

[iscdirector]

Check your springs with a valve spring tester to see what height measurement is needed to obtain the best spring pressure. The shop manual calls for 1.660 in. which is supposed to give you 78 to 86 psi seat pressure. I always set the spring pressure at 90 to 95 lbs which seems to improve idle and HP. But different brands of springs all check a little different so it is good to check them with a tester. Also when the valves and seats have been cut at the machine shop you should check the rocker arm geometry when you assemble the engine. This is critical for a rebuild to run good and the valve guides to last 
--- On Thu, 2/4/10, Les <corvair at mts.net> wrote:


From: Les <corvair at mts.net>
Subject: <VV> Engine building - valve spring installed height
To: virtualvairs at corvair.org
Date: Thursday, February 4, 2010, 10:53 PM


Question for today - on my 140 engine build, using basic small block 
chev valve springs (2.08" free height as per Corvair book) with Elgin 
perf. type steel caps, 304 cam, should I stick with stock 1-21/32" 
spring height or something different? I need about .090 in shims (seems 
like a lot) to get stock spring height with the Elgin caps, or .050 with 
stock caps.

Thanks,
Les

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