I measured the pushrods lenght, and decided to go with 7.200". I'm not cool with this because 7.250" and 7.150" looks also fine. Marks are centered in 3 cases and same narrow. If I can find anyone who uses the same pushrods as me with this setup it will be great. And also let me know what lenght did you use pls.

Valves are 0.100" longer. ---> required 0.100" longer PR
Morel lifters ---> required shorter PR
Heads milled (from 76cc to 64cc) ---> required shorter PR

1.6 NSA Pro Mag. Rockers
0 deck block

7.200" make sense??

 

i have 7.250 on mine

 

lifters ?

 

Take the guts out of a lifter, put in a bolt with washers and put the clip back on, make sure it doesn't compress, now if you have and inner spring on your valve springs, take out exhaust and one intake spring out and put in just the inners, then put masking tape on the valve and turn the engine over, then look to see if you're really in the middle. I find it's easier to tell when you use lash caps which I recommend anyways.

I used 7.150 on mine, stock heads milled who knows can't remember anymore, I think .020 or so, impy gaskets and LE3 cam, I thought I'd need taller cuz of the cam, but this wasn't the case, 7.2's were too big, if you find you can't see the difference between 7.150 and 7.250, you're doing something wrong.

Maybe the smaller set of pushrods uses a big ball on the ends that don't sit perfectly in the rocker/lifter cups making them seem longer? Check all that, I remmend a comp cams pushrod length checker, with inner spring it won't break when you turn the engine over.