[d1mbu1b]

Can one use BBF springs in a Pontiac head?

[Z Code 400]

D1,

There are a lot of parts that could be retrofitted into a Pontiac. However, you would be far better off using the correct valve springs. I have torn down Pontiacs that had (stock) small block Chevrolet valve springs installed on the heads. The engine was running when it was disassembled, but I just don't care for that sort of thing.

Now, in the 1980's we ran BBC springs on our 429 Fords by using a Iskenderian 507-STA retainer that allowed an additional .075" installed height. In that application, there was a specific reason to use the BBC spring.

With the number of quality springs currently on the market, specific to the application, there isn't any viable reason to use any other springs. For example, the Crower #68404 dual spring is an exact replacement for the stock Pontiac dual spring and works with camshafts to .550" lift.

It's a universal spring that works in a wide vareity of applications...Robert

[PONTIAC DUDE]

You can use any spring you want as long as the installed height, diameter w/retainer and pressures are what ya need.

I have aftermarket BBC single springs on the wife's 455 with an 068 type cam.

[Z Code 400]

P-Dude is correct and I failed to illustrate that point...Robert

[d1mbu1b]

thanks for the help.


So how do you measure the spring pressure?

Say for example I want to see if my old springs are still springing properly.

thanks again

[johnta1]

You need a valve spring pressure checker.

[JJKJ]

Originally Posted by d1mbu1b

thanks for the help.


So how do you measure the spring pressure?

Say for example I want to see if my old springs are still springing properly.

thanks again

Stand with your back against the wall. Mark your height with a permanent marker on the wall.

Zip tie a pair of valvesprings you want to check to the bottom of each shoe (you can check 4 springs this way).

Take two good bounces on the springs and mark how high you bounced on the same wall you measured your static height.

Depending on your weight and spring rate, you should get a good 6-8" of air. If not, or the springs break, time for new ones. If the springs poke up through the bottom of your shoes, time for new shoes too.

Make sure you wear eye and head protection during all bouncy activities.

P.S. Poster is only giving a suggestion on how to check valvesprings and takes no responsibility for broken valvesprings, torn shoes, laughing neighbors, aggitated wife (due to marks on the wall) or sprained ankles. Bounce at your own risk.

[d1mbu1b]

Originally Posted by JJKJ

Zip tie a pair of valvesprings you want to check to the bottom of each shoe (you can check 4 springs this way).
Take two good bounces on the springs and mark how high you bounced on the same wall you measured your static height.

How about a nut, long screwdriver, and a fish scale.
place the nut on the rocker stud
place the screwdriver on the valve and under the nut
hang the fish scale on the end of the screwdriver 10 times the distance between the valve and the rocker.
pull on the fish scale
multiple the weight by 10