Hardened pushrod discussion...come on in...

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Aug 31, 2003 | 06:26 AM

#21

4thGENRETARD

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From: Further South than Hell

Re: Hardened pushrod discussion...come on in...

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No, the point I am trying to make is that GM made the Pushrods weak for a reason.

Yeak for the same reason it put crap front brake rotors that warp after the first 2K, and for the same reason it kept the **** 10 bolt Diff. (A legacy of the 80's) amongst other bogus parts. They're not in the profit margin scheme.

Quote:

If I can get away with using the stock (softer) pushrods without any problems and I do happen to miss a shift then I will most likely bend a pushrod instead of a valve (if it does not over-rev by alot). If you replace a factory pushrod with a pushrod whose yield strength is higher than your valves and you miss a shift then something has to give and it is probably going to be a valve.

If you replace springs (Which u should) the probability of u bending a valve is strongly diminished, and if u do it, that won't be because u are using better grade PRODS.

Aug 31, 2003 | 07:14 AM

#22

niphilli

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From: Raleigh, NC

Re: Hardened pushrod discussion...come on in...

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No, the point I am trying to make is that GM made the Pushrods weak for a reason.

Quote:

If you replace springs (Which u should) the probability of u bending a valve is strongly diminished, and if u do it, that won't be because u are using better grade PRODS.

cool, I never thought about the pushrods being bent from Float, but that does make senese. The valves would be much less likely to float with a set of 918s.

Do valves normally bend from float or from the over-stress of high revs and aggressive cam lobes?

Aug 31, 2003 | 08:00 AM

#23

4thGENRETARD

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From: Further South than Hell

Re: Hardened pushrod discussion...come on in...

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Do valves normally bend from float or from the over-stress of high revs and aggressive cam lobes?

Yes, yes and yes. in basic terms, they can bend when the valvetrain geometry gets wacked out. Or if your valve to piston clearance is wrong (Valve slaps piston).

Aug 31, 2003 | 08:36 AM

#24

LS1derfull

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From: new england

Re: Hardened pushrod discussion...come on in...

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Anyone have any input??

TTT

I have hardened pushrods and .585" lift 220* cam, with heads milled .035", i shift at 6800 rpm with 918 springs and i have backshifted from 3rd to 2nd while at the track and no bent parts what so ever! I feel lucky but this should be the acid test imo.

Aug 31, 2003 | 11:28 AM

#25

niphilli

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From: Raleigh, NC

Re: Hardened pushrod discussion...come on in...

Thanks for all of the input guys.

I think I am going to go with a small cam a little later on this month and stay with the stock pushrods at first. If they do bend I will swap them out for the hardend rods and let you guys know.

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