Valve train, Information Options

[sjhenry1075]

Hey everyone,

I apologize if this is common knowledge, I am just trying to learn my one thing for the day.

So I am building a 2056 and I just need a little more information regarding rockers/swivel foot adjusters, 8mm vs 10mm adjusting screws, etc..

I currently have a stock 1.7 that came with my 71, but I am also building a 2056 that will have dual 40 IDF's, 86a cam, and 2.0 heads with 44/38 valves.

I keep reading about using 1.7 rockers. Are they referring to the rockers on 1.7 engines? What is the benefit to using swivel foot adjusters? 911 adjusters?

I am really trying to learn as much as possible about these engines and each component.

[brant]

the 1.7 rockers already have the correct thread size to accept swivel feet adjusters
they will need to be machined slightly to work and give you correct range of adjustment
there are threads about how to machine them, and you can even use a grinder to get that clearance.

the later 2.0 motors use a different thread size so can not accept swivel feet.
I believe there may be an aftermarket swivel feet made for them currently

the advantage of the swivel foot is that it swivels/flexes to better make contact at the correct angle with the valve stem

so better fitment.. more even wear... and slightly better alignment in the valve trail
potentially with less wear they will maintain that clearance setting better.

you need to also measure and make custom pushrods during assembly to get equal lift on each of the 8 rockers.

search valve train geometry threads.