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Indy head users...Ever see this?
#1272807
07/23/12 06:46 PM
07/23/12 06:46 PM
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Joined: Mar 2003
Posts: 2,495
PA
moparacer
OP
top fuel
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OP
top fuel
Joined: Mar 2003
Posts: 2,495
PA
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I broke a valve spring on my engine and when it broke, it spun around and chewed up the spring pocket that was machined into the head. I had been having trouble with metal in the oil ever since I put these -1s on the engine, and as a matter of fact, it blew up the first day out with the new heads on it...
Well, come to find out after I pulled it apart last night that the metal around the spring pockets is so thin in spots, the springs can break chunks of it off and get into the oil.
Look at this pic of the spring pocket that broke.
See where it had been breaking off prior to the spring breaking? And look at the spring right beside it. See where its been breaking off and getting into the oil? There is a piece about ready to go....
Just thought I would post this and save someone a years worth of headache and broken parts like I have had....
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: Indy head users...Ever see this?
[Re: pittsburghracer]
#1272812
07/23/12 08:04 PM
07/23/12 08:04 PM
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Joined: Feb 2005
Posts: 20,156
PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,156
PA.
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Pretty sure it was hemi Fred that posted the link showing how much a valve spring rotates in the pocket at different rpm's. I couldn't find the link but it is a good one to watch.
1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27
Livin and lovin life one day at a time
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Re: Indy head users...Ever see this?
[Re: catman408]
#1272819
07/23/12 10:29 PM
07/23/12 10:29 PM
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Joined: Mar 2003
Posts: 2,495
PA
moparacer
OP
top fuel
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OP
top fuel
Joined: Mar 2003
Posts: 2,495
PA
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The next small block will be a Chevy Felix. I could have bought 4 or 5 for what I have went through trying to be a Mopar purist. And I would bet a Brodix or a Dart head would have the spring seats cast properly to boot. 
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: Indy head users...Ever see this?
[Re: moparacer]
#1272820
07/23/12 10:32 PM
07/23/12 10:32 PM
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian
super stock
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super stock
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
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Quote:
Quote:
machine the heads for a proper spring cup and that'll end your problems.
Whats the proper spring cups? Its a 1.55 OD spring supplied by Bullet. #VS8100
As you can see they have the locators for the inner springs on them already.
your locator may be the wrong size for your spring
COMP VALVE SPRING ID LOCATORS 1.550" O.D. Spring Inside Dia .715" .060" Thick
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Re: Indy head users...Ever see this?
[Re: moparacer]
#1272822
07/23/12 11:50 PM
07/23/12 11:50 PM
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Joined: Jan 2009
Posts: 1,044
Victoria, Australia
Ian
super stock
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super stock
Joined: Jan 2009
Posts: 1,044
Victoria, Australia
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Quote:
Quote:
Quote:
Quote:
machine the heads for a proper spring cup and that'll end your problems.
Whats the proper spring cups? Its a 1.55 OD spring supplied by Bullet. #VS8100
As you can see they have the locators for the inner springs on them already.
your locator may be the wrong size for your spring
COMP VALVE SPRING ID LOCATORS 1.550" O.D. Spring Inside Dia .715" .060" Thick
Mine are .060 thick .730 ID and correct for the spring.
try these COMP CAMS VALVE SPRING LOCATOR SEAT CUPS 1.780" O.D. .640" I.D. .060" Thick
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Re: Indy head users...Ever see this?
[Re: moparacer]
#1272828
07/25/12 10:34 PM
07/25/12 10:34 PM
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Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,492
So. Burlington, Vt.
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it looks to me like whoever cut the heads to accept those spring locators used a cutter that increased the diameter of the pocket, probably to about 1.640 or so(unless the OD of that locator is actually way smaller than 1.550).
as the heads come supplied from Indy, the pocket is only 1.550, and the small step at the base of the guide has too large of an OD for a locator to fit over it, so someone machined those heads to accept the locators.
also, if the springs you're using are actually like 1.560 or 1.580(also common sizes these days), then you can end up with a situation like what you have, unless the pocket is opened up to accept the bigger spring.
i have a customer that ran some SR heads with a roller cam and 1.550 springs in his S/G roadster for over ten years without anything to locate the springs other than the pocket machined into the head, and never had an issue with anything getting chewed up or ending up in the pan.
when i set those heads up for over-sized springs(1.625+) and/or spring cups, i remove the rest of whats left of the original pocket to keep those pieces from breaking off.
IMO, its not Indys fault you had this issue with the pieces breaking away from the heads, but rather whoever machined those heads for the locators and didnt trim away what was left behind.
when i have gotten heads from Indy that are already cut for the 1.625 springs and cups, all that extra stuff around the pocket is gone.
in any case.......just grind away whats left there, and you'll be good to go.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Indy head users...Ever see this?
[Re: fast68plymouth]
#1272829
07/25/12 11:03 PM
07/25/12 11:03 PM
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Joined: Jun 2003
Posts: 9,225
Charleston
sixpackgut
Drag Week Mod Champion
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Drag Week Mod Champion
Joined: Jun 2003
Posts: 9,225
Charleston
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my EZ heads from Dwayne have been on my engine since 07. just had the valve covers off a month ago and looked carefully at my spring pockets and all looked good. i was changing out the comp 829s that have been in the engine since 07 and they looked and felt like new also.
Gen 3 power 6.22@110, 9.85@135
Follow @g3hemiswap on instagram
performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
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I went ahead and machined them flat and bought a set of hardened spring seats that center on the valve guides for my size springs 
cups locate the spring better then straight shims.
