426 AC valve springs. May 18, 2016 01:03PM
Wondering what to run for a decent set of valve Springs in my 426. Something with around 150psi of seat pressure. Herd big block Chev ones with shims but wondering if anyone can give me some other ideas. Thanks !
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Re: 426 AC valve springs. May 19, 2016 09:37AM
That's what we use B.B.Chevy just check for binding if you got ground cam.
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Re: 426 AC valve springs. May 19, 2016 11:06PM
Did you have to shim them at all to get the correct height? What do you mean by binding? I have a billet cam.
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Re: 426 AC valve springs. May 20, 2016 01:00AM
An example of binding would be...if a spring has a installed height of 1.500 and the coils touch (bind) at 1.00 that leaves .500 of spring travel,say .060 for clearance so there's .440 of useable spring.now the cam has a lift of .400,and a 1.5 rocker arm ratio is used,so now lift at the valve is .600.so the spring has a negative clearance of .160. This will bend a rocker or pushrod.it's best to do the numbers on paper and call a supplier.I use Pac spring in michigan
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Re: 426 AC valve springs. May 20, 2016 04:27PM
Thanks for the clarification. I never took that into consideration at all. I'm not 100% sure on the cam as I havnt got it yet and I'm quite new to this, but I believe it's .245" lift and 1.65 rocker ratio
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Re: 426 AC valve springs. May 21, 2016 07:10PM
the can doesn't need to be installed to check lift either,support the ends in 2 oiled "v" blocks and put a dial indicator on it,find the lowest point,set indicator to "0" and spin cam slowly,mark the highest reading,multiply by rocker ratio,thats lift at the valve,
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