How much valve spring on sbc?

Well i'm building a 301 chev with duntov cam and 2.02, 1.60 valves and was wondering if i run the set of Speedway solid lifter valve springs if it will be too much spring for the motor.Comp cams who i got the cam from suggests a weaker spring but will it hurt me to run these. This motor will probably be abused more than most too.

Sorry i dont have the numbers with me now.

 

if the cam maker is recommending a weaker spring, go with a weaker spring.

do a little searching on the hamb about flat cam lobes and you'll understand why.

 

uhhh...yeah....run what they say, or the cam will go out quick

 

Those cam companies do a lot of research,and listen to a lot of feedback,LISTEN to them!!!

 

What's already been posted. If you want to go to the trouble (and it won't be if you were to wipe a cam) break it in with a set of the oldest, weakest springs you have at 2,000-2,500 rpm for the first 20+ minutes (W.O. shutting it down) then switching to your permanent running springs. Be sure to put a can EOS (Engine Oil Supplement availaible at your Chevy dealer) in the crankcase for the first fire-up.
Most Chevy factory cams call for spring pressure in the neighborhood of 90-100 lbs. on the seat. See if that corresponds with the cam maker recommendations.

Frank

 

All this, and racing oil because it still has some of the stuff that's taken out of current oils. Also, make sure you check the OPEN pressure. You'll never see a base circle go flat, so seat pressure's NOT as important as open pressure. Make sure it's within the limits of what Comp says. It's the nose/lobe that goes flat. Remember that

 

Follow the Comp cam guys recomendations the know what they are talking about I agree with Groucho about the open spring pressures to much spring pressure when the valvle open will bind and put xtra unneeded wear on the cams nose thus/ premature cam failure

 

okay thanks

 

I break in cams on Rotella or Delo, but I understand the new rotella has the zinc removed. Doh.

Anyways - run a good diesel oil for initial break in and use lots of cam lube. A can of GM EOS is a a good insurance policy also if its a stiff cam. Never break in a cam with 1.6 rockers. Use stockers or the special 1.2 rockers to break in the cam.

The rowdier the cam the less margin for error in break in. With that old design cam with its soft lobes, you can probally get away with good oil and a can of EOS.