Here’s what I get from looking at the specs for the springs on these heads.
Closed = 117 lb
Open = 292 lb, but this was stated with what was the original cam that had .470” lift, which is not what the production 323 cam had.
The 323 cam only had .406” lift!
Now with no info on what the actual springs rates where my best guess is a open pressure with the .406” lift of 260 lbs .
This to me would be marginal with with the valve weight of even the 4.980” length valves, no less the longer heavier valves in the SD motor.
Just to make a comparison the 1968 428 HO motor had springs that provided 129 on the seat and and 272 open @ .414” .
What do you folks think?
Mike do you still have the stock springs to do a check on?
__________________
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Last edited by steve25; 04-08-2024 at 06:59 PM.
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