[gtofreek]

That #995 spring will probably be way too much spring for the 326 heads. You need to check the spring installed height and find some springs that will achieve 115-130 lbs. on the seat[because the intake seats are 30°, they need more seat pressure] and 300-320 lbs. open, and it will be happy. IIRC, the 326 heads will set up around 1.550-1.600 or there about. The #995 spring will give about 150-170 lbs at that height.

It's easy to find a spring from the spring catalog. Just follow these steps:

Write down the installed height. Let's say for this example it's 1.565".

Now write down what the valve lift will be. Let's say it's .489" in this case.

Now, you can look up the springs in the dual spring section by O.D. to find a spring that is the right size.

Now, write down the valve spring rate, in this case we will use the Comp # 995 spring, which is 402 lbs. per inch.

Then we need to know what the spring is rated at. In this case, the # 995 spring is rated at 115 lbs. at 1.700 height.

Write down the coil bind height. In this case it is 1.020".

Now you have all the info, so you just need to do the math.

The spring is rated at 1.700, but your installed height is 1.565". You need the difference between them, which is .135". Now you multiply the spring rate by the difference of .135" which is 54.3 lbs.

Add the 54.3 lbs. to the 115 lbs. the spring is rated at when installed at 1.700". This gives you 169.3 lbs. on the seat.

Now you have a valve lift of .489", so if you multiply that by the spring rate of 402, you get 196.6 lbs.

Add the seat pressure of 169.3 lbs to the 196.6 lbs., you get 366 lbs. open pressure.

Now if you subtract the amount of valve lift, or .489", from the installed height of 1.565", you get 1.076".

Subtract the coil bind height of 1.020" from the open height of 1.076", and you have .056" of spring travel before the spring becomes solid, or coil binds. Here you want a minimum of .050" coil bind clearance.

In this case, the #995 spring would be way to stiff for a hydraulic flat tappet cam, but just right for a hydraulic roller cam[if one could be found with only .489" lift ;^].