Posted By: 75dusted
question on cam lifts and stock rockers - 05/05/10 08:59 PM
On a small block 318 , with the stock rockers and pushrods, how high of lift on a flat tappet hydraulic cam can the stock rockers be used with
question on cam lifts and stock rockers
Posted By: scratchnfotraction
Re: question on cam lifts and stock rockers - 05/05/10 09:06 PM
up to coil bind 
spring pressure are what kills stock rocker arms,IMHO
I run .485 lift/comp 901-16 springs on a roller cam and all stock valve gear and rockers
you can get more with machine work but the rockers still are limeted on spring pressure
for a stock 318 head comp 901-16 are a good spring and work well with stock valve gear
they are good to .500 lift,IIRC
.485 lift and the comp 901 spring has worked good for me on all my stock 318 heads/engines
even have a lunati 292/292 bracket cam with .485 lift and comp 901s
OH! and if it has rotators on the exhast valves,ditch them for a standerd spring hieght and use 8 intake retainers on them
the rotators will not take much lift at all and use a shorter spring height
spring pressure are what kills stock rocker arms,IMHO
I run .485 lift/comp 901-16 springs on a roller cam and all stock valve gear and rockers
you can get more with machine work but the rockers still are limeted on spring pressure
for a stock 318 head comp 901-16 are a good spring and work well with stock valve gear
they are good to .500 lift,IIRC
.485 lift and the comp 901 spring has worked good for me on all my stock 318 heads/engines
even have a lunati 292/292 bracket cam with .485 lift and comp 901s
OH! and if it has rotators on the exhast valves,ditch them for a standerd spring hieght and use 8 intake retainers on them
the rotators will not take much lift at all and use a shorter spring height