On a 440 / 500 ci engine build with a set of cast iron heads using a Comp Cams Xtreme Energy .564 cam and a valve spring spec of 330 psi open @1.275 at .600 lift, will a stock push rod hold up. Also, how much run out is acceptable on a stock type 5/16 push rod.

The reason I ask is I checked the stock push rods that were in the engine when it was pulled down. (the car was bought not running and nothing was known about the engine) and found all the push rods to have about .003-.005 run out. I thought maybe at some time this engine had a different cam/valve spring set up in it and maybe had some coil bind and bent the push rods. So I ordered a new set from SBI thinking I would get straight ones. When I start checking them I see that none of them are perfect, and can get as much as .010 of run out. I called the SBI tech line and asked about run out and how much spring pressure they would accept, they had no clue.

So will a stock push rod take this spring pressure and how much run out is acceptable on a push rod for this build????


Thanks!
Dan