i have a 5.3L s/ced w/ 02 z06 cam, ls6 springs, longtubes and exhaust. should i get different pushrods? also, which ratio roller rockers should i get... 1.7 or 1.8? thanks.

 

Do you have $650? If so, get the 1.85 Comp Pro Mags and some hardened pushrods. If you have a little more cash go to the Jesel SS shaft mounts, but I don't think they come in the 1.85 ratio.

 

I'd get the 1.7 ratio rollers since you already have the cam -- let it provide your lift and duration. If you do go for the bigger ratio, make sure you re-figure the lift and clearence with the new ratio to avoid piston-valve procreation (their offspring tend to be heartache, sorrow, and empty wallets), and respec your springs.

AFA pushrods, if you need them for length get 'em. Heck, even if you don't, I think hardened pushrods are like 90 bucks...

 

Screw the ProMags. Run some Jesels SS's. Adjustable rockers suck!!! You will have to clearance the valve covers to run the Jesels or any big body rocker. I had to toy with mine for a while. But they fit and dont hit!!!

 

what advantage would running a 1.7 roller rocker provide over stock? I really don't want more lift than I already have.

 

anybody have anything on this?

 

1.7 is the stock ratio

 

so is there an advantage to using stock sized roller rockers?

 

can't really tell you that, it will be different for different setups, however in general the more aggressive your setup gets the closer to needing them you will be. Some do it early, some never need them, some do it for cool points, you have to evaluate your setup and see if they make sense.
Less friction, better valve control using quality pieces.