This is topic Valve spring help in forum Tech Talk at Northern California Ford Owners  .


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Posted by jaybquick (Member # 4286) on :
 
I am getting a custom cam ground for my 347. It will have .600 lift and the cam builder said I should have a spring with 380 to 400lb when fully open and about 130 to 150lb on the seat. I will be running Comp Cams stock type roller lifters and 1.6 rockers. Right now I have AFR 185s with the 1.43" OD springs and a 1.8" installed height. I will be installing titanium retainers.

My question is, what spring should I run to keep valve float away at least until 6500rpm. I am looking at Comp 987-16s go HERE(2nd row 2nd column) or Crower 68382-16 go HERE (page 33 of 42)

Any other recomendations will be greatly appreciated. Thanks
 
Posted by AJBlackGT (Member # 3936) on :
 
Thats a healthy cam [Eek!] But i have no idea about the springs, the cam grinder probably knows best, so anything within his specs would probably work fine [Confused]
 
Posted by 93PONY (Member # 60) on :
 
The comp springs will NOT cut it.
The best springs I've used have come from Ed Curtis. 425lbs on the nose w/145 seat, XE lobes w/.600+ lift & over 7000rpm without valvefloat.
www.flowtechinduction.com

Ask for the Pure Street springs. Those things rev to 8K in race cars with stock lifters.
 
Posted by jaybquick (Member # 4286) on :
 
thanks 93 pony, anyone else got ideas. I am just double checking on my cam grinder.
 
Posted by AaronC (Member # 86) on :
 
Another vote for the PS style springs. Ed is a valvetrain genius.
 




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