Hello all,
I have a '89 Firebird , 305 Vin Code. I have a P1SC Supercharger installed along with the Accel Superram and Gen VII+. As of now I have the stock cam, however I am going to install a better cam, mainly for the exhaust. The cam is rated for 5500 RPM. I need to know what kind of perfromce push rods to use. I have no idea what size I have 5/16 or 3/8 and I dont know what the +100 , +160 or +200. I just want some good performce rods. Any information or suggestions will be greatly appreciated.

Thanks
Brad

 

I don't really think you need to change the length. That's what the "+" sizes mean. I would just go with a good set of hardened pushrods. I learned the hard way not to cheap out on pushrods. Be sure to get the one piece kind, NOT the kind with the little ball pressed in. I had one of the ***** come off one in my Chevelle, I ended up mushrooming my valve stem, chewing up my rocker stud and destroying a rocker arm.


Hope this helps you out,
Jason

 

Jason,
What manufactor do you recommend?
Brad

 

Brad,

I don't really have a specific preference. I just always go with a reputable manufacturer. I used Crane pushrods in my Chevelle. But it's really up to you, there are several good companies.

Jason

 

Get yourself an adjustable push rod, and once the engine is assembled with the new cam in it, determine the optimum length. Nobody can tell you, from the list of parts you gave especially, what you'll need. Everything from head gasket thickness, to block deck height, to head work including decking and valve jobs, to rocker arms, etc. etc. etc. will affect the optimum length. Blowers, DFI, intakes, and the other things you mentioned, don't matter.

Yours are no doubt 5/16" diameter like other Chevy small blocks.

http://www.compcams.com/catalog/278.html
http://www.compcams.com/catalog/279.html

 

The pushrod length length needed depends on what you have for rocker arms and also your valve length. Some heads call for a valve that is .100 longer and some rocker arm designs require a longer or shorter pushrod...

The stock length for a hyd roller cam is 7.3" and the stock length for a hyd flat tapper is 7.8"...

Using an adjustable pushrod is the way to go...but first you can use a stock length pushrod and a marker and the following instructions

http://www.compcams.com/information/Products/Pushrods/

Where the tip of the rocker wears the marker off on the valve tip will tell you how close you are...

 

Doh...RB83L69 beat me to posting...

What he said too

 

So is it possible to have differnet lengths for different valvles or will all the pushrods be the same length?
What cylinder would I use to check the length?

Brad

 

For me...I used a few different cylinders...but all the pushrods for the engine should be the same length...assuming same rockers and valve length throughout.