On the A series 1275 cc engines, offset bushes on the steel rocker shaft were made to take the rocker arm from 1.18:1 to 1.31:1.
You'd be better using a narrowed FE rocker arm, and use custom made Offset bushes on a downsized rocker shaft. You can easily get another 12% rocker ratio from some stock 1.5:1's to get 1.69:1. But if you use machine down (narrowed) 1.73:1 FE hydraulics, you can get 1.65 on the small six, and then go up to almost 1.85:1,the same as an OHC Falcon 4.0.
Ask RAS if they will outsource them to build a 1.76:1 non adjustable hydraulic rocker http://www.spridgetmania.com/part/2A21/ ... dget--Mini
http://www.ausmini.com/forums/viewtopic ... ht=rockers
No one in there right mind would spend a pound to get an ounce. No, hang on, um, what I ment was probably "spend ounce money for no bang for the buck". Ford started with a serious 1.76:1 solid lifter ratio, any I6 builder stuck with 1.5:1 ratios should do the same.
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.
You should put your heart & soul into everything you do.
You'd be better using a narrowed FE rocker arm, and use custom made Offset bushes on a downsized rocker shaft. You can easily get another 12% rocker ratio from some stock 1.5:1's to get 1.69:1. But if you use machine down (narrowed) 1.73:1 FE hydraulics, you can get 1.65 on the small six, and then go up to almost 1.85:1,the same as an OHC Falcon 4.0.
Ask RAS if they will outsource them to build a 1.76:1 non adjustable hydraulic rocker http://www.spridgetmania.com/part/2A21/ ... dget--Mini
http://www.ausmini.com/forums/viewtopic ... ht=rockers
I tested S rockers, pressed steel rockers, and the late sintered ones.
I found the S ones gave 1.16:1, pressed steel 1.21:1, and sintered 1.18:1.
All were measured on the same 12G940 head, with an RE13 cam (0.290" lobe lift) fitted.
I like the pressed steel (round pad) ones, with 0.44" offset bushes in I can get them up to 1.31:1 ratio. And their pads are harder than the S rockers.
See Image http://home.exetel.com.au/zoomini/zoomi ... GP1558.JPG
The oval pad 1275 ones with the same offset bushes, I got 1.35:1. Simon K has a set in his S.
No one in there right mind would spend a pound to get an ounce. No, hang on, um, what I ment was probably "spend ounce money for no bang for the buck". Ford started with a serious 1.76:1 solid lifter ratio, any I6 builder stuck with 1.5:1 ratios should do the same.