tdrumm

iTrader: (18)

The duration of the cam is unaffected, but the valve duration is increased.

hog

Right on, valve duration is affected by rocker arm ratio, just like valve lift.

Increasing(or decreasing) rocker arm ratio by 0.1:1 will increase or decrease the duration by 2 degrees.

example:

GM Hotcam(LT4)
0.525"/0.525" 218/228 duration 112 LSA with 1.6:1 rocker arms
0.500"/0.500" 216/226 duration 112 LSA with 1.5:1 rocker arms

peace
Hog

TURBHOE

iTrader: (4)

so if i take my lift and divide it by 1.7 and multiply by 1.8 that will give me my new lift and then just add 2 to the duration. is this correct?

hog

As long as 1.7:1 is the original ratio of the rockers, then yes.

peace
Hog

TURBHOE

iTrader: (4)

sweet so has anybody use the ls7 springs on anything will they fit i read in hot i think that they were good to some pretty high lift in the mid .600's i think but they had to replace the retainers i think it was so the spring sat a little higher and reduce coil bind other than that they were goods stuff just need to know if they will fit our heads.then for like 250 you could have a good spring and rocker upgrade.

samdogmx

iTrader: (13)

so has anybody ran these yet? I really want to get some more lift outa my little cam. Do these work OK?

TURBO8

iTrader: (9)

I was wondering would your pushrod size change?

SS_bnoon_SS

iTrader: (3)

It *shouldn't*, but as with any cam, head, or rocker arm change you will have to check your own combination before final assembly.

TURBHOE

iTrader: (4)

so what about these valve springs will they work is any one gonna try'em if i knew there was a very good chance i would do it but i still have a d-max intercooler in my garage that i have to custom fit because it was beleived to be a drop in job and wasn't

samdogmx

iTrader: (13)

nobody using these rockers yet? Im gona order some, guess i'll be the first to try them out?