The TC-TD valve springs have 120lb pull pressure.
The late TD-TF springs have 150lb pull pressure.
The factory got it wrong. They saw shiny areas between the springs, and
concluded that the springs were subject to valve crash. In fact, they
were
going into oscillation.
Both are double sets, using same top holders and bottom cups.
I recommend the TC-TD springs. Only 90 lb pressure is required on a
stock
4 cylinder engine to pull the valves closed, with stock compression
ratios.
120 lb is not too much more than 90 lbs, 150 lb puts a lot of pressure
on the cam lobes and lifters.
You are only as stong as your weakest link.
John Seim
Irvine, CA
On May 7, 2008, at 7:37 PM, Mike Duvall wrote:
> Anybody know the difference in the TC/TD valve springs and the late
> TD/TF valve springs sold by Moss? Is one the triple set and the
> other the double set? Are the top holders and bottom cups the same?
>
> Mike
> _______________________________________________
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