Why need roller rockers when essentially my stock 07 Twin Cam rocker is already a shaft driven roller design ? $500.00 dollars later for 4 rockers, I'm getting an added roller tip? I know with my race cars the roller tip on the rockers wasn't of much value, the roller section that mounted through the head stud or shaft was where the benefit was. I ran the TW-8-6 (.590 lift) cam with the stock rockers and everything looked great when taken apart. Now the big question, why do I need to run after market roller rockers with the TW-9F-6? Another question, will I gain anything(besides lift) by going to a 1.725 ratio rocker? Would I run them on just the Intakes or Exhausts too ?
Thanks For Your Input,
Augie

 

Augie, my understanding was, the reason for the roller rockers is to help with the valve train geometry with substantially larger lifts, basically decreasing resistance while increasing the foot print of the rocker from the stock pad, why are you chaning the tw8 to the 9? i would bet you wouldnt be happy with the hp/tq increase after you weigh in the financial aspect of all that too, just my two cents, chad.

 

I think you get a little faster opening of the valves with the 1.725 as well as the additional lift. I think the ramps on your 9f's are already plenty steep.

 

theres a reason i just cannot think of it now. but it was not a good out come.
i run the Baisley ones and he makes them for yourt cam lift . altered geometry ones
also run that cam streight up.

 

I believe roller rockers help reduce the side load on the valve stem with high lift cams.

 

Less friction, reduce side load on the valve stem, free HP that you don't need on a stock Twin cam as you aren't set up to make big power and high lift. Also, you don't need 1.7 rockers either for you stock set up. Leave it the way it is and enjoy riding it, as your set up can't take advantage of these mods.