calc pushrod length

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Mar 29, 2009 | 07:30 AM

#21

7thson

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Joined: Apr 2005

Posts: 749

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From: West Yarmouth MA.

Here is a helpful article on this. I hope info is correct because I just ordered a set of pushrods after using this proceedure. http://www.hardcorels1.com/vbulletin/showthread.php?t=622[/URL]

Mar 29, 2009 | 08:11 AM

#22

willyfastz

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Joined: Oct 2005

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From: Vanceboro NC

Quote:

Originally Posted by coanan

Now i know why checking is so important, looks like I may have been running .130 preload with the 7.350

Exactly, and if you want the best performance don't go over .050" preload with your new pushrods, .020" to .040 will be best in a 11/32 diameter.

Mar 29, 2009 | 08:17 AM

#23

willyfastz

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Joined: Oct 2005

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From: Vanceboro NC

Quote:

Originally Posted by 7thson

Here is a helpful article on this. I hope info is correct because I just ordered a set of pushrods after using this proceedure. http://www.hardcorels1.com/vbulletin/showthread.php?t=622[/URL]

You can do it that way but the easiest way would be to just torque the rock to 23ftlb make sure the cam is on the base circle, put your adjustible pushrod checker in and tighten it until your at 0 lash. Then just remove the pushrod checker, measure it with a dail caliper and add .020" to .040" to it and order your new pushrods.

Mar 29, 2009 | 08:35 AM

#24

vettenuts

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Joined: Mar 1999

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From: At the beach in little Rhody

Quote:

Originally Posted by coanan

Now i know why checking is so important, looks like I may have been running .130 preload with the 7.350

And to think most just buy 7.400" and slap them in not knowing what preload they have nor does anyone really check the rocker geometry and wipe on the valve stem.

Mar 29, 2009 | 08:47 AM

#25

willyfastz

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Joined: Oct 2005

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From: Vanceboro NC

Quote:

Originally Posted by vettenuts

And to think most just buy 7.400" and slap them in not knowing what preload they have nor does anyone really check the rocker geometry and wipe on the valve stem.

But isn't that what they're being sold as correct on some of the big sponsor sites?

And then theres valve springs, everyone just buys a set of brand X duel valve springs and installs them blindly without checking the install height or anything. And putting duel springs on a setup that beehives would be more than enough spring and yield better hp. If people would take the time to set up their springs and get the right length pushrods they would have better performing and more dependable setups consistently.

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