Originally Posted by
thenova70ss
Hey guys i have aS7 and a WS7-III and would like to know how maney shims to run 20%? I took the heads off and they have 1 shim on each is this right for 20% the guy i got them from said he ran 30% but i was thinking you need 2 shims for 30%.
Add 0.1mm shim to the engine.
Just make sure you know, shims aren't all 0.1mm.
Stock the engine should have two shims;
1) 0.2mm
1) 0.1mm
that gets you a total of 0.3, you need one more 0.1 for 30 percent(0.4mm). You could also use two 0.2mm shims if you wanted, to only have to bother with a total of 2 shims.
EDIT: if you want to run 20 percent, use 0.3mm in shims total (probably the two the engine came with....although i'd still check)
if you want to run 30 percent, use 0.4mm in shims total