Are 3100 pushrods hardened?

[sd_iconoclast]

I am building a 3400/2.8 iron head hybrid to go in my fiero. Because the 3400 has taller (roller) lifters, mt 2.8 pushrods are too long. The longer pushrods from a 3100 seem to be just the right length at 6.080", but I do not know if they are hardened to work with guideplates. The 3100 does not use guideplates, but my engine will.
How can I tell generally if a pushrod is hardened?

[SappySE107]

They are not hardened. 6.080 isn't going to be an off the shelf pushrod either. 6.050 or 6.100 would be the closest you could find.

[sd_iconoclast]

I have pretty much resigned myself to having to get custom pushrods made. The shortest "off the shelf" pushrods I have been able to find have been 6.125"
Thanks for the info.

[geoffinbc]

Get pushrods from a 3100 between 1993 and 1996 they do not have self aligning roller rockers and use guideplates. These pushrods will be hardened.

I have never seen any proof that later pushrods are not hardened. It may just be theory

[SappySE107]

Well, they dent in my pushrod holder and a hardend pushrod won't do that. Not a crimp or anything severe but it leaves a little mark.

[SappySE107]

I sell custom length pushrods (will be on the store this week after i get my aluminum blocks to complete my setup). If you go custom, get the exact length you need since it costs the same to be exact vs close.

[RednBlack]

If you want to know if they are hardened, go to any reputable machine shop and have one checked for Rockwell.