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Topic Review (Newest First)
05-30-2012 11:25 AM
swompz
Quote:
Originally Posted by AutoGear
what heads are these? Im very curious

Uncertain , got them recently from cheap from a chap i met a while back , maybe pro comps but no ones come up with a definitive on them , see thread bellow

http://www.hotrodders.com/forum/anyo...ds-219765.html

just trying to get parts togeather to assemble them & measured spring pocket recess & found them to measure 39mm so trying to come up with a plan.
05-30-2012 10:52 AM
AutoGear what heads are these? Im very curious
05-30-2012 10:41 AM
swompz
Quote:
Originally Posted by cobalt327
Those will work if the guide boss OD is around 0.525". Obviously, if the guide boss is larger, the cup ID can be enlarged by hand.
Theres no guide boss as such the heads have bronze valves fitted directly into the head face.
05-30-2012 10:27 AM
cobalt327
Quote:
Originally Posted by swompz
So would they locate on the valve guide oposed to the edge of spring seat?

if that was the case with valve spring cups , Im in business.
http://www.summitracing.com/parts/MA...6-16/?rtype=10
Those will work if the guide boss OD is around 0.525". Obviously, if the guide boss is larger, the cup ID can be enlarged by hand.
05-30-2012 10:07 AM
swompz
Quote:
Originally Posted by cobalt327
See post #10.
So would they locate on the valve guide oposed to the edge of spring seat?

if that was the case with valve spring cups , Im in business.
http://www.summitracing.com/parts/MA...6-16/?rtype=10
05-30-2012 09:52 AM
cobalt327
Quote:
Originally Posted by swompz
Seems like best idea to me two , but cant find anything.
Likewise Im having trouble finding a valve spring set/ caps collets etc the right size for the spring pockets with an open pressure no more than 350lb
See post #10.
05-30-2012 09:51 AM
swompz
Quote:
Originally Posted by cobalt327
I've never tried to use a stock diameter spring on a 1.54" spring seat, but if I were going to do this, I'd look for a locator like I pictured above that locates off the spring ID.
Seems like best idea to me two , but cant find anything.
Likewise Im having trouble finding a valve spring set/ caps collets etc the right size for the spring pockets with an open pressure no more than 350lb


springs I was looking at have following specs

Number of Springs Per Valve Single
Outside Diameter of Outer Spring (in) 1.260 in.
Damper Spring Included Yes
Spring Rate (lbs/in) 357 lbs./in.
Inside Diameter of Outer Spring (in) 0.875 in.
Valve Spring Style Standard
Coated No
Retainers Included Yes
Retainer Material Steel
Locks Included Yes
Lock Style 7 degree
Lock Groove Quantity 1-groove
Lock Material Steel
05-30-2012 09:49 AM
cobalt327 You need to know the ID of your springs. Here are a couple internal locators for 0.570" and 0.505" spring ID.
05-30-2012 09:44 AM
cobalt327
Quote:
Originally Posted by swompz
thanks for the input guys.

So to summarize "correct when wrong"

It is safe to use a valve spring with the od of 1.26" on a alloy cylinder head that has a spring pocket diameter of say 1.54"

However At the least I will need hardened shims to stop gailing of the head, or preferably spring locators or cups.
Installed spring height obviously needs checking.

I cant help but feel that there should be something stopping the bottom of the spring from moving.... A spring locator will obviously do this, however I cant find any listing on summits site of a shouldered locator that has the correct od for pocket & spring fitment.
any ideas lads?
Thanks
again.
I've never tried to use a stock diameter spring on a 1.54" spring seat, but if I were going to do this, I'd look for a locator like I pictured above that locates off the spring ID.
05-30-2012 09:14 AM
swompz thanks for the input guys.

So to summarize "correct when wrong"

It is safe to use a valve spring with the od of 1.26"
http://www.summitracing.com/parts/SUM-174001/
on a alloy cylinder head that has a spring pocket diameter of say 1.54"

However At the least I will need hardened shims to stop gailing of the head, or preferably spring locators or cups.
Installed spring height obviously needs checking.

I cant help but feel that there should be something stopping the bottom of the spring from moving.... A spring locator will obviously do this, however I cant find any listing on summits site of a shouldered locator that has the correct od for pocket & spring fitment.
any ideas lads?
Thanks
again.
05-30-2012 08:14 AM
engineczar You definitely need at a minimum a hardened shim to protect the aluminum head. I've used both the cup type and the I.D. locator type. Both work fine. In either case you need to verify the guide diameter to make sure it drops into place ok. As Cobalt said you also need to account for the thickness of the cup which in most cases is .06
05-30-2012 07:50 AM
cobalt327
Quote:
Originally Posted by swompz
Ok, so am I right in assuming you can safely fit.springs with an od. Smaller than the spring pocket?
Yes
Quote:
In my head the springs need to have something to centralize them.??
I would, as long as the installed height can be maintained (you don't want to use up too much of the available installed height using a stock length valve and a spring cup or locator). But like I said, there are guys who successfully run the springs on just a hardened shim so the spring doesn't eat into the head.
05-30-2012 02:32 AM
swompz Ok, so am I right in assuming you can safely fit.springs with an od. Smaller than the spring pocket? In my head the springs need to have something to centralize them.??
05-30-2012 01:42 AM
cobalt327
Quote:
Originally Posted by swompz
Glad to know I.measured.valve.correctly, but what about.the.diameter of.the.spring pockets? The springs I was going to use.are.only.1.26" od. But the.pockets on heads are 1.550" can I do this & will I need a locator for the springs??
You can use a cup (Manley, Crane, etc.) or a locator that registers off the spring ID (shown below):



There are those who don't use anything except a hardened shim to keep the spring from fretting against the aluminum head.
05-30-2012 01:13 AM
swompz Glad to know I.measured.valve.correctly, but what about.the.diameter of.the.spring pockets? The springs I was going to use.are.only.1.26" od. But the.pockets on heads are 1.550" can I do this & will I need a locator for the springs??
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