Need help !!!!
 

Ok guys i have a good question im rebuilding my motor right now , And im Stuck on Pushrods. I have Pro Magnum Lifters , and GM Performance 1.6 rr's. What I want to know now is what size pushrod should i go with. Help please !

Order the size you need after you measure with an adjustable pushrod checker. http://www.compcams.com/information/Products/Pushrods/

just for a heads up, if using hydraulic lifters , you need to either install 1 solid lifter and use pushrod checker to get proper length or..... take hydraulic lifter, measure how far it compresses split the difference (200/ths = 100/ths) that would be the preload amount. then install lifters,pushrods and run rocker down til it just touches the lifter, measure length, thats the length you need + the 100/ths for preload. gm's 50 -100ths preload.
your much safer using a solid lifter measuring with pushrod checker then adding 50-100ths for preload

What all is done for this rebuild?

Pro mag lifters = Comp Rs?

And I have a PR checker if you need to borrow one, they are pretty cheap though.

What motor is this on?

You can make a solid lifter out of whatever lifter you're using by disassembling it and turning the plunger upside down (or removing it entirely and putting a bolt/etc. cut to proper length).

Are the heads milled at all? Stock style head gasket? Stock deck height?