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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pushrods

Post  hbstang on December 21st 2017, 7:01 pm

thanks for all the input on this.i bought some 7/16 x .120 wall just to test the fit,and they will fit the heads no problem.but these .120 wall feel like bricks,so could i use a thinner wall with the noted springs in first post?and what wall would that be?.intake is 8.500 long and exh is 10.200 long.
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Re: pushrods

Post  Frank Merkl on December 21st 2017, 7:34 pm

well maybe I don't know what I'm doing but we run fast ! my 600 inch C460 headed motor only ever had a 3/8" x .080 wall pushrods with 340 lbs seat and 990lb open with are .940 lift cam . never a failed pushrod or witness marks from moving around ! and it seen north of 9000rpm lots
Frank
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Re: pushrods

Post  rmcomprandy on December 21st 2017, 8:03 pm

Unless it is a high RPM, all out race engine, with normal 7,000 RPM and under engines, the pushrod I use is 3/8" x .080" wall. I will step-up to 3/8" x .165" wall if the spring tension gets above 750 pounds force and the camshaft flanks get somewhat aggressive and 7/16" x .165" wall on the exhaust side if the engine is to use nitrous.

Higher RPM and heavy valve trains or extremely aggressive camshafts may need more.

I can literally walk to Trend from here so, getting anything they make is no issue at all; (I wish they still made 3/8" x .135" wall).

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pushrods

Post  hbstang on December 21st 2017, 8:25 pm

ok,i guess i am over thinking this.i can run what i have.i have heard that long pushrods can flex to much.exh is 10.200.
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Re: pushrods

Post  Frank Merkl on December 21st 2017, 8:49 pm

we switch 2 years ago to a 7/16" .134 wall , et & mph improvement 0 ! just more work to make them fit!
Frank
on our 712 motor we run a 7/17" .134 wall thou as there an inch longer !
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Re: pushrods

Post  Frank Merkl on December 21st 2017, 8:50 pm

7/16"
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Re: pushrods

Post  BOSS 429 on December 21st 2017, 11:20 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



all back together,and running now?
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