Does anyone know how much lift i can have with the stock valves/pistons on a 90 5.0? I have an E303 (.498/.498) cam and am getting 1.7 (or 1.72) roller rockers.

My (calculated) lift w/ 1.7's is .529 and .535 w/ 1.72's. Will I be able to run that combo without changing anything else? Please help!!

 

stock heads right?

 

yes, and stock springs--I know the springs will have to go.

 

New valves definately.

 

why so much lift on the stock heads, they wont flow any better up that high unless they've been worked. And ummm... better check for PTV clearance because its gonna be way close.

 

i think max is like .550 so you should be fine