Help with rocker arm ratio choice?

[TA49-WE4]

Looking to buy a set of roller rockers for my car and im wondering what ratio I should go with. 1.55, 1.60 or 1.65

My setup is in my sig.

Future upgrade plans for my car are iron champion heads, champion stock ported intake and a 6262 billet turbo when the turbo on my car now cashes out. ( This will however be a few years down the road )

Car is 90% street 10% track

Just looking for some input on what people think.

Thanks

 

[87WE4BOOSTED]

??

I asked this same question a few months back, and it really depends on the CAM Specs. (i.e. Valve Lift etc..etc..) There is an equation that you can do to see which ones are needed. Here it is: http://www.turbobuick.com/forums/engine-tech/310467-1-55-1-65-roller-rockers.html

In my case my webber 206/206 only needs 1.55 rockers. I too have Champion Heads.

Hope this helps!!

Steve

 

[TA49-WE4]

Im running a comp cams 69-200-8 cam 206/206

Intake exhaust
duration: 258 258

duration @ .050 206 206

valve lift: .496 .496

lobe lift: .32 .32


lobe-center is 110 and intake centerline is 110


The valve springs on the car are comp cams beehive's 26918-12

seatload: 125lbs @ 1.800
open: 367 lbs @ 1.150
spring rate 373 lbs/in
coil bind 1.100

 

[bison]

whatever ratio will give you about .500 lift