Bent Pushrod Query/Mishap
Race Director
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From: SW Florida.
If the inner spring comes out, install the inner only on the valve and turn engine over by hand. Once again, you need to have words with the people that sold you those springs. Now, you need new springs. Think beehive...
Le Mans Master
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From: Cool Northern Michigan
I don't believe that inner spring is classified as a spring. I believe that is a spring damper. Takes the vibration harmonics out of the outer spring. But yes, it does look like it could bind, but to the extent of bending pushrods like yours? Not convinced.
One more question: Was clay applied to the tops of the pistons to check valve / piston clearance when this whole thing was going together? You need at least .080 if not more on the exh side.
By the way. Thanks for the excellent updates and photos to help others in the future.
One more question: Was clay applied to the tops of the pistons to check valve / piston clearance when this whole thing was going together? You need at least .080 if not more on the exh side.
By the way. Thanks for the excellent updates and photos to help others in the future.
Last edited by HeadsU.P.; Jun 24, 2018 at 05:28 PM.
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I grabbed a spring assembly and clamped it in my vise. It bound at ~ 1.28” with the dampener and ~1.12” without the dampener. Perusing a spring catalog it seems like typical spring bind is @ ~1.2”.
I realize every spring is different but clamp an assembly in a vise and check the bind height...But I think you figured it out.
I realize every spring is different but clamp an assembly in a vise and check the bind height...But I think you figured it out.
Last edited by jim2527; Jun 24, 2018 at 05:27 PM.
Thread Starter
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From: Midland TX
Thank you guys for all of the help and deductive reasoning...and thanks to my friend with the awesome Snap On bore scope lol. I assume you cant run these springs without the center spring. Would it be cheaper to buy the valve guide cutting tool and use the current springs, or grab a set of LS1 beehives and retainers (if you suggest a set or part number, please let me know). The valves measure at 4.875" intake and 4.91" exhaust, which i believe is stock length. Im going to try to order everything tonight. Seeing as I still have the pushrod discrepancy of .13", do yall suggest I go with a 7.05 pushrod? I will have to give the valve clearance clay method a try.
Last edited by Crm318; Jun 24, 2018 at 06:51 PM.
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From: Midland TX
- On unmachined Vortec Heads .550” Max lift
- 1.260 OD Valve Spring Super Clean Material
- 115# @ 1.800” Install will take a max of .600” lift
- 7 degree Machined Valve Locks
- 1.250 Steel Retainer 7 Deg 11/32 +.050
Last edited by Crm318; Jun 24, 2018 at 07:06 PM.
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https://www.jegs.com/i/COMP-Cams/249/26915-16/10002/-1
This should work. I would still cut the Valve guide down a little to get a safer distance than what you have now.
This should work. I would still cut the Valve guide down a little to get a safer distance than what you have now.
Last edited by Gunfighter13; Jun 24, 2018 at 09:03 PM.
Pro
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From: Texas
I recommend you change over to this type of valve seal.
https://www.jegs.com/i/Edelbrock/350/9725/10002/-1
https://www.jegs.com/i/AFR-Airflow-R.../6611/10002/-1
https://www.jegs.com/i/Edelbrock/350/9725/10002/-1
https://www.jegs.com/i/AFR-Airflow-R.../6611/10002/-1
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From: Midland TX
https://www.jegs.com/i/COMP-Cams/249/26915-16/10002/-1
This should work. I would still cut the Valve guide down a little to get a safer distance than what you have now.
This should work. I would still cut the Valve guide down a little to get a safer distance than what you have now.
Pro
Joined: Mar 2014
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From: Texas
No matter which way you go, I would cut the valve guides down. If you are confident there has been no damage to the springs you could go that route. But for me I would spend the money for the peace of mind it would give me.
Last edited by Gunfighter13; Jun 24, 2018 at 10:46 PM.
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So are you saying the inner damper is going solid at full valve lift? Should be able to put the assy with retainer, spring and damper in a vise and compress to installed height minus .525 and see/measure to make sure.
JIM
JIM
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From: BC
Hi Jim, I think his inner spring is binding on the valve guide boss causing it to expand on compression and bind on the inside of the outer spring. Result would be reduced spring compression (inner) and bent push rods.
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From: SW Florida.
BUY A SET OF BEEHIVE SPRINGS AND RETAINERS THAT FIT THOSE GUIDES!!! those dampers bind before you get to .525. you run those springs with no dampers and they are weaker. send those springs back to the guy who said they would do .550 on unmachined vortec heads.
