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Help with pushrods

  #1  
Old 02-28-2013, 09:58 AM
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Help with pushrods

I built a 390 for a friend recently and it came back this week with bent pushrod. I need some help now finding replacements.

The motor is a mild 390 bored .040 over with flat top pistons, a Lunati Voodoo 62001 cam with matching valvesprings and new retainers and keepers. The motor was running great for about 200 miles, but it started a tap when he started it one morning. Turns out it bent the pushrod on the #1 intake valve, and the pushrod was hitting an intake bolt. I checked lifter clearance when I first put it together and I know it was within spec. I straightened the pushrod this time and put it back together and lifter clearance is less than 1/4", which again is within spec. I started it up with the straightened lifter and it runs perfect, no funny noises. I assume the reason it bend is because it is weak???

I tried to order new replacement rods with stronger bodies, but, even though they were advertised with 3/8" tips, the tips actually measured much smaller at .310". Summit says that I have to have pushrods custom made to my specifications. Really? Custom pushrods for a mild 390 with mostly stock internals???
 
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Old 02-28-2013, 10:07 AM
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with that cam (same as mine ) the stock replacement pushrods should be fine .
 
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Old 02-28-2013, 10:26 AM
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Looks like you have basically the same setup as I do. Only difference is that I'm running an old Edy Streetmaster intake with a 670 Holley.

Can I purchase NEW stock replacement pushrods? Summit doesn't seem to sell them.
 
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Old 02-28-2013, 11:08 AM
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yes
but the problem is what length and are the rockers adjustable or not ?
my block and heads came out of a 67 tbird and there was no machining done so my pick was easy .
 
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Old 02-28-2013, 11:25 AM
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if i remember right i got the sealed power 9.621
 
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Old 02-28-2013, 11:29 AM
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No, the rockers are not adjustable, and the heads are from a different motor than the current block.

Has anyone used the Crower Adjustable pushrods?

Crower Adjustable Pushrods 70000-16 - SummitRacing.com
 
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Old 02-28-2013, 05:19 PM
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  #8  
Old 02-28-2013, 05:45 PM
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great article

thanks bamaf150 , now i have to check mine
 
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Old 02-28-2013, 08:24 PM
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Yes, I saw that article and ran through the step on this engine. My specs checked out well within range. Which makes me wonder why this rod bent. Like I said, I straightened the rod back out and put it back in and the motor runs perfect, so I don't think there's anything wrong with the valve (new guides in heads too).
 
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Old 02-28-2013, 09:51 PM
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Hitting an intake bolt ? Please explain.


All pushrods same length?
rotating while it's running ?
Did you check geometry ? Load the lifter, mark the valve stem tip with marker, rotate engine full cycle and load lifter and check for centerline scuffing.
 
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Old 03-03-2013, 01:19 PM
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The pushrod was hitting the intake bolt after it bent. It actually rubbed a notch into the pushrod where it was hitting the bolt. It does not hit the bolt when it is straight.

Yes, all of the pushrods are the same length, I checked them.

I started it up with the valve covers off and confirmed that all 16 are rotating when running.

I'm not sure exactly what you mean by checking the geometry. centerline scuffing?
 
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