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Author Topic: Valvesprings  (Read 3653 times)

Offline eventhorizon66

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Valvesprings
« on: June 19, 2008, 09:41:40 pm »
So sometime in the not so near future I plan on trying my hand at a cam swap.  I am planning on bumping it up just a notch over stock with this cam (should be worth 20-25 hp without hurting fuel economy).  The plan so far is just cam, lifters, and Cloyes double roller timing chain (cheap upgrade IMO).  My question is should I worry with upgrading the valvesprings with such a mild cam?  If so what is the preferred method - air or string?  I personally like the sound of the string method since it's fool proof (so long as you don't try to compress the string too much).  I just know if I try air I'll accidentally tap a valve off its seat and lose pressure.  Also what springs would you recommend if I upgrade?  Are stronger pushrods recommended with any valvespring stiffer than stock?  Ah, that wonderful mushrooming effect...

Keep in mind 5200 is redline, and it almost never sees above 4500.

BTW specs for the stock cam are 194/202 @ 0.05" and .383"/.401" on 112 LS.  Do you guys think this is too much work for such a mild improvement?  Could I get away with this cam without too much loss in cruise efficiency (approx. 2000 rpm @ 65 mph)?  If I did go with this one, new springs would be mandatory, though.
« Last Edit: June 21, 2008, 09:39:06 am by eventhorizon66 »
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'85 C10 SWB 350 700R4 TKO600

Offline 76 k10

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Re: Valvesprings
« Reply #1 on: June 26, 2008, 02:17:27 pm »
comp cams 268h best cam iv ever had for my driver! iv ran this cam in my 78 pontiac trans am and it was the best!!!! and if you love loppy ideals this is the cam for you lol
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Offline 76 k10

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Re: Valvesprings
« Reply #2 on: June 26, 2008, 02:18:11 pm »
and stock springs should be alright
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Offline VileZambonie

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Re: Valvesprings
« Reply #3 on: June 26, 2008, 04:39:50 pm »
Your stock springs will work fine with that cam. If you decided to go bigger you want a valve spring that has the correct open and closed seat pressures along with installed height. This is much easier to do and set up on the bench. My advice is if you decide to go that route to pull the heads and do it dead on. At the same time screw in studs and guide plates along with roller rockers would be ideal but if you are going to use that Summit cam just leave the heads and springs alone.
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Offline eventhorizon66

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Re: Valvesprings
« Reply #4 on: June 26, 2008, 07:21:52 pm »
OK thanks.  The more I think about it, the more I like the idea pulling the heads for the spring swap.  I don't know why I thought heads-on would be simpler.  But if it ever comes to pulling the heads I'll be putting a set of prep'd L31 heads in their place.  And then slip in something like the 224/234 cam  ;D
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'85 C10 SWB 350 700R4 TKO600

Offline 76 k10

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Re: Valvesprings
« Reply #5 on: June 27, 2008, 12:56:57 pm »
that a boy lol the bigger the better hahahahaha
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