pushrods

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pushrods

Post  hbstang on January 9th 2017, 9:00 pm

i need to change out the push rods on my new engine before i try to run it.combo is kaase boss 429 heads,comp roller specd from kaase,and manley 221443 springs.lift is .740 ,.024 lash hot.max rpm maybe 7000-7200 max,so what pushrod should i look for?i think a 7/16 will fit the block and heads,maybe some minor clearances.so knowing that what would the brand,wall thickness,dia would the experts here suggest.i used a 3/8 .080 wall before in a similar engine but that had less cam and springs.
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Re: pushrods

Post  gt350hr on January 9th 2017, 9:23 pm

Dan it depends on length. 7/16ths is good as they get longer . I like a thicker wall 3/8ths.

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Re: pushrods

Post  cfb289 on January 9th 2017, 9:57 pm

That spring is 610# @ .700, the Isky spring I run in mine is 590# @ .700, My cam was .718 total and I just ran the 3/8 pushrods from Kaase (they look like they were made by Trend), but they have Kaase's name on them. 5000 street miles, no pushrod problems (broken roller lifter though). On an A460 block I had to notch the block to clear the exhaust pushrod on number 4 with a 3/8 pushrod.

A more important question would be what size oil hole to run in the pushrods?

Cheers.

Craig
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Re: pushrods

Post  Scott Foxwell on January 9th 2017, 10:17 pm

You get far more strength from cross section than wall thickness. I would run at least a 7/16 x .09 wall with that combination if it's doable.

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Re: pushrods

Post  Lem Evans on January 9th 2017, 11:11 pm

cfb289 wrote:That spring is 610# @ .700, the Isky spring I run in mine is 590# @ .700,  My cam was .718 total and I just ran the 3/8 pushrods from Kaase (they look like they were made by Trend), but they have Kaase's name on them.  5000 street miles, no pushrod problems (broken roller lifter though).  On an A460 block I had to notch the block to clear the exhaust pushrod on number 4 with a 3/8 pushrod.

A more important question would be what size oil hole to run in the pushrods?

Cheers.

Craig

It's not important at all. Here is what matters I.M.O.

1] How much oil is allowed to enter the lifter gallery from the priority gallery.
2] """""""""""""" Enters the edge orifice of the of the lifter.
3] """""""""""''''' That enters the lifer is allowed to get to get to the pushrod seat/cup.

A Pushrod can't flow more than it can get.

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Re: pushrods

Post  cfb289 on January 10th 2017, 12:33 am

Lem is correct. When I wrote that I was only thinking about the Crower lifters, installed as Crower tells you to install them (.080 edge orifice, and .080 all the way to the pushrod seat). Install the Crower's with the oil hole away from the lifter oil galley, or run a lifter from a different manufacturer and you don't need to use the pushrod as an oil restrictor.

Craig
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