Push rod 3/8 .145 or 7/16 dual taper?

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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  Lem Evans on September 24th 2015, 9:09 pm

68galaxie wrote:I have followed the advice from Manton.
I did not decide on what push rod to use on my own or had preconceived ideas. I was leaning towards a 7/16" dual taper before
I talked to Manton.

I provided all the engine build details and rpm range to Manton.
I used their suggested push rod.

Sorry if I can't follow everyone's suggestions. 7/16" would be stiffer sure, - but possibly not required at <7000 rpm?
Manton uses 275,000 psi material for the push rod tube (hence the 3 piece design) Other one piece designs use 165,000 psi
material. Manton told me the 275,000 psi material is stiffer than the 165,000 psi material.

I do appreciate everyone's suggestions and comments.

Cheers!

Freelander used the word "sufficient" and what you have is that and then some.

But, If my father knew, back in 1965, how long the F series were going to get he'd made the service dept. 10 feet wider.

It was a chance to grab a little more than u needed if/when u wanted to step up the program.

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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  kim on September 26th 2015, 10:03 pm

Pro Stock pushrods look more like telephone poles than pushrods. Not only does the raised cam make them shorter, but the 1/2?-9/16? diameter .200?-wall thickness makes them virtually impossible to flex ensuring total advertised cam timing at the valve. And in case you’re wondering, Comp Cams puts the timing in the neighborhood of 276-300 degrees duration at .050? lift, 1.100?-1.300? of lift and lobe centers around 120 degrees.

Pretty small cams considering... lots of lift....

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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  Lem Evans on September 27th 2015, 12:45 pm

The 60mm and larger cam cores also affect the duration required.

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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  kim on September 27th 2015, 1:37 pm

Lem Evans wrote:The 60mm and larger cam cores also affect the duration required.
Them 60mm cores arent free and not the easiest to come by.  Took a couple months to source mine.  Need some better heads so I can shorten my durations, Ide love to be under 300 at .050.    Anybody know of some Thor, C, or hemi heads commong off a project?

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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  Lem Evans on September 27th 2015, 2:51 pm

Damn it, you've ruined my day.....I always thought 60mm cores were free Laughing


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Re: Push rod 3/8 .145 or 7/16 dual taper?

Post  kim on September 28th 2015, 1:56 pm

Lem Evans wrote:Damn it, you've ruined my day.....I always thought 60mm cores were free Laughing

Touche'

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