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Author Topic: valve spring  (Read 3756 times)

Offline dieselman123

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valve spring
« on: April 05, 2014, 10:22:29 am »
Does anyone kno if stock replacement valve springs on vortec heads can support a lift of .462 on intake and .469
on exhaust? Currently building a 355 for my 83 c10 swb. Planning on using comp cam 12-238-2 cam kit. Thanks in advance
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Offline LTZ C20

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Re: valve spring
« Reply #1 on: April 05, 2014, 10:58:51 am »
Stock vortec valves springs can only go about .425" valve lift. The head has a tall seal height and oversized guide bosses. Seal heights can be shortened and the spring pockets can be machined to provided about .550" clearance. If your willing to pay for the machine work.




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Offline LTZ C20

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valve spring
« Reply #2 on: April 05, 2014, 11:25:01 am »
Also, that's the exact same cam I am using in my 355. Engine only has about 1000 miles on it. Runs great, I really like it. I put my foot into it from about 35 mph or so and that thing shot my up to 60 before I knew it. You can check out my engine build in the performance section under the topic "My New Little Beast". My build post isn't done yet but I've been really busy.
« Last Edit: April 05, 2014, 11:29:58 am by LTZ C20 »
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Offline VileZambonie

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Re: valve spring
« Reply #3 on: April 05, 2014, 01:41:10 pm »
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Offline dieselman123

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Re: valve spring
« Reply #4 on: April 07, 2014, 07:33:46 am »
Its gonna cost 80 bucks per head to have it everything done to them but Wat is puzzling me is with your set up Wat size and length push rods did you use. Building the exact same motor but can't figure out Wat push rod to use
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Offline LTZ C20

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Re: valve spring
« Reply #5 on: April 07, 2014, 11:26:39 am »
What exactly do you mean by the exact same? You mentioned using Vortec heads, those are cast iron. I used aluminum Dart heads. What parts are you using same as mine?

I used Comp Cams CCA-7372-16 pushrods. They are one piece chromoly rods.




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Offline dieselman123

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Re: valve spring
« Reply #6 on: April 07, 2014, 02:14:11 pm »
I meant to say same setup as far as the motor goes. Only thing different is I'm using cast iron heads and you are using aluminum. Will those push rods work with cast iron vortec heads
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Offline LTZ C20

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Re: valve spring
« Reply #7 on: April 08, 2014, 12:05:23 am »
Oh ok. As far as I know, Vortec heads did not turn the small block 350 into a different engine. It's still a sbc350. So as far as I know it should be the same. I'm sure someone else will chime in but I believe they are the same. About a month ago I saw a Vortec 5.3 from a 04 1500 torn apart in the shop and the push rods appeared the be the same size, shape and length as my old 350. They could have been slightly different but without measuring and just looking they looked just about the same.

So I'd double check or see if someone comments but I think they will work.




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