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Old 04-17-2013, 08:51 AM
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Valve spring suggestions?

Hi guys, I'm new here.

I have a Gen 1 sbc 350 that I am building the top end on currently. Stock bottom end since it was rebuilt by my brother before I got it. I have a good working quadrajet, edelbrock performer vortec style intake manifold, 350 vortec heads from a 96 suburban. I plan on getting screw in studs and I am wondering if I want to use an edelbrock performer rpm cam, what kind of valve springs should I go with? I would like to keep the stock valves and rockers possibly since this is more of a budget build than serious horsepower.

What valve springs do you guys suggest? I'm calculating a compression ratio of 9.83:1 with a .015" head gasket, pistons 0.020 in the hole, 4.00" bore, 3.48" stroke.

And will I have to have the spring pockets machined as well?

My buddy has a holley carb he might give me as well.

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Old 04-17-2013, 02:05 PM
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The GM 124992324 beehive valve springs are hard to beat. The are drop in valve springs without any machine work. You must purchase Comp Cams retainers and locks. I suggest Comp Cams 795-16, 10 degree retainers and 613-16, 10 degree locks. Factory retainers and locks for the 12499224 beehive valve springs are for valves with 8 mm stems.

GM 12499224 (blue) 2001-2004 LS6 (set of 16) $66.01 msrp
126 lb. @ 1.700" seat pressure
314 lb. @ 1.200" open pressure
376 lb. per inch rate
1.085" coil bind
1.250" OD / .845" ID bottom
1.055" OD / .650" ID top

Excellent valve springs for mild hydraulic roller or flat tappet camshafts.

Last edited by MouseFink; 04-17-2013 at 02:18 PM.
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Old 04-17-2013, 06:47 PM
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The motor may be a little soft. I figure the DCR at 8.19:1 with that cam installed straight up. Advancing it 4 degrees on installation would raise the DCR to 8.41:1 and should make the motor a little snappier. Just a thought. Also, I think I'd opt to pin the studs rather than go through all the work to cut the pads and thread the holes for screw-in studs, especially on a budget motor. I'd pin 'em and run the rail rockers.
Here's the cam card....
Performance Camshafts, Lifter Kits and Matching Valvetrain from Edelbrock - Cam Card Locator
Here are the stud pins....
http://www.summitracing.com/parts/mrg-806g
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Old 04-18-2013, 12:02 AM
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you can also use screw in studs that do not have a shoulder.
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Old 04-19-2013, 09:13 AM
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So my buddy gave me a 650 cfm Holly carb for free! I think I'll go with the Edelbrock sure seat valves to match the performer rpm cam.

The same friend of mine has a Sbc 350 in an old dodge truck with an Edelbrock performer rpm top end and it runs excellent.

I've decided to bite the bullet and abandon my budget tight build, even if it takes me longer to complete, it will be worth it.

I'm going to get the cylinder heads magnafluxed, and if they're good, all the exhaust valves are rusted so I will need a valve job done anyways. I think the heads were pulled off and left outside at the junkyard. All of this is going to cost me about as much as the Edelbrock cylinder heads but I can't afford a large purchase like that upfront. Vortec heads are still pretty good for what they are.

I've heard that to put in larger valves it would cost about as much as a regular valve job, is this true? I was planning on getting undercut valves anyways.
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Old 04-19-2013, 01:00 PM
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Before you spend all that money on crack-prone iron heads, call these guys and talk with them about the Assault aluminum cylinder heads that they sell. I know nothing about them personally, but member AP72 has talked about them before on different threads....
KMJ Performance
107 Industrial Park Road
Story City, IA 50248
515-733-2890
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Old 04-19-2013, 03:25 PM
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Sorry I forgot to mention I intend to port the heads and port match the headers and intake. Are those Edelbrock sure seat springs garbage?

See I work at a gmc dealership just as a lube tech and my parts guy said he wouldn't even run those z06 springs. But I can get them for like 60$ a set here. I may keep the stock valve size with undercut stems. I'll post a video of his truck he has that Edelbrock top end kit in, it sounds mean. Gears may come later but I plan on getting a 700r4 transmission for overdrive and I can get a stall converter put in at that time as well.
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Old 04-19-2013, 05:34 PM
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LS6 valve springs:
GM 12499224 (blue) pack of 16

Checking and shimming for the correct assembled valve spring height and seat pressure is a routine procedure, no matter what valve springs are being used.

The LS6 valve springs:
126 lb. @ 1.700"
Shimming valve springs is always required. When using stock valves, the amount of shimming depends on the depth of valve seat recession. .

Larger diameter intake valves, larger throats and under-cut valve stems will increase port volume and reduce intake port velocity. The port velocity can be increased by larger engine displacement and/or forced induction. Larger diameter exhaust valves increase flow and undercut stems has no effect of exhaust velocity. For optimum NA intake to exhaust flow balance, the exhaust valve diameter should be 80% to 85% of the diameter of the intake valve.

1.94" : 1.50" = 77% (stock)
1.94" : 1.60" = 82%
2.02" : 1.50" = 74%
2.02" : 1.60" = 79%

If larger valves are installed, the valve throat diameter should be enlarged to 90% the diameter of the intake valve and the exhaust valve throat diameter should be enlarged to 85% the diameter of the exhaust valve. Both throat angles at 80 degrees.

LS6 valve springs are considered "drop in" valve springs. Meaning, no machine work is required to fit the springs the the original spring pockets. The spring pocket is 1.253" OD and the LS6 valve spring bottom coil is 1.250" OD. The valve spring register (guide boss) is .775" OD and the LS6 valve spring is .845" ID bottom coil. .
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Old 04-19-2013, 06:02 PM
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Well the good thing is that I haven't bought anything yet except for the vortec heads, Edelbrock performer intake manifold, and summit racing long tube headers. I appreciate the help though. My truck is a 76 c20 3/4 ton with a recently rebuilt engine. My purpose is to have a truck that's fun to drive on the street that makes good midrange power so I don't accidentally smoke the tires but can pull pretty hard when I lay into it.

What's the best way to check for lift clearance? I'm assuming the rpm cam is for lighter cars? I was just bent on getting it because I've heard good things about it.
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Old 04-19-2013, 10:07 PM
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you should make a new thread with the new questions
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Old 04-19-2013, 10:32 PM
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Hold the valve spring in place with air pressure, remove a valve spring, reassemble the keeper and retainer without the valve spring and measure from the bottom of the retainer to the valve seal. After removing the valve spring, compress it in a vise from 1.700" until it reaches coil bind and measure the spring, subtract .050" gives the maximum valve lift the valve spring will accept.



You don't have to go through all that, because it has been done for you.

Stock valve springs on 350 CI Vortec heads will accept valve lift of .460" before the bottom of the retainer hits the valve seal. A 5.7L (350 CI) L31 Vortec valve spring (GM-10212811) is set up at 80 lb @ 1.700" and reach coil bind at 1.175". That is .475" maximum valve lift, including .050" safety margin. GM recommends .080" safety margin which limits the valve lift to .445".

Therefore, maximum of .445" valve lift for stock 5.7L (350 CI) L31 Vortec heads and valve springs. .
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Old 04-19-2013, 11:37 PM
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Thanks guys, I think were done here.
And F-BIRD'88, your unwanted sarcasm would be best not posted at all. It just makes you sound like a dick.
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Old 04-20-2013, 12:16 AM
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Goodnight Dick.
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Old 04-20-2013, 12:20 AM
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What a tool, don't post at all if you're gonna *****.
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