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Old 07-22-2013, 11:59 AM
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Mystery Valve Springs

I've just bought a set of reconditioned 063 BBC heads with 101cc chambers.

These heads came more or less complete, with new valves and springs.
The seller didn't know the details, but the valves are new stainless ones, and the springs are dual with a damper.

I'm a little concerned about spring bind, not knowing the specs.

Is this something that I can measure / determine myself, or should I load them up and have a machine shop do this for me?

I do have a dial indicator that was included in my degree wheel kit ... but seriously lack the knowlege of what and where to measure. Get the min / max measurements from the retainer? Even that is extremely "iffy" with bled-down hydraulic lifters, right?

How would I know if the springs are binding? Zero clearance between the outer coils?

Option B:
Swap out these dual springs with the single springs I am currently using on my 781 heads. Mahle-Clevite #212-1325 which are good to .600.


I'm currently running a Comp XE284H which is .574 / .578 lift

Option C:

I'm seriously considering installing a slightly "tamer" cam ...
Comp XE274H which has a lift of .552 / .555
which is probably better suited to my needs anyway.
I'm expecting just over 9.0 CR with these heads
TH400 with a B&M Nitrous Holeshot 2400 RPM converter
3.73 gears in a 66 GMC truck.

Perhaps option B & C combined is the way to go?

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Old 07-22-2013, 12:36 PM
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Here's some pics of the heads and spring ...




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Old 07-22-2013, 01:16 PM
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Replace the valve springs and set the new springs up to seat and open pressure that will work with your camshaft. Never use "mystery" valve springs unless they have been removed and checked for bind and rate (pressure). Valve springs are important.

Option "C" camshaft
Comp Cams 924-16 valve springs
Dual with damper
112 lb. seat pressure at 1.900"
304 lb. open pressure
1.175" coil bind

Or equal
Good spring pressure for a high performance daily driver.
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Old 07-22-2013, 02:13 PM
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MouseFink, there's a [2] footnote on those Comp 924-16 springs that says:

Quote:
[2] Requires machining on cylinder heads
The specs on these springs, I think, sort of confirm my theory on coil bind?
Valve Open Spring Height is 1.20, and valve bind occurs at 1.175

This is making me a little nervous
I'm thinking it's time for a pro to have a look at these heads and springs ... and find out exactly what I have.

Trouble seems to have the ability to find me ... I don't have to go looking for it.

Last edited by 66GMC; 07-22-2013 at 02:19 PM.
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Old 07-22-2013, 04:27 PM
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Your heads are already machined and fitted for the CC-924-16 dual valve springs. No machine work is needed.

"Option C" camshaft has valve lift of .552" / .555".
CC-924-16 valve springs set up at 1.900".
Valve spring open height will be 1.348" intake - 1.345" exhaust.
Coil bind is 1.175".

The CC-924-16 valve springs are perfect for "Option C" camshaft.

You can worry about something else.
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