JDOM111

iTrader: (6)

When you raise to a higher nitro percentage do add or remove head shims?

Team Kamikaze

iTrader: (3)

You add shims.

Which engine are you running?
What nitro % are you switching to?

JDOM111

iTrader: (6)

359 tuned that is drag modded.moving up to 40 or maybe even 55%

Roger

iTrader: (10)

Possibly two silver shims and one copper shim. I may be incorrect. Hopefully someone will come in and provide more 411. Goodluck.

Geezatec

Add shim

mtmmotorcycles

If you are using this engine for drag racing you definatly will not want to add shims!!! A good starting point depending on weather is to run 18 thou piston to head clearance on 50% nitro, but remember this is for drag racing only not circuit racing!!

tdu verney

So what's the rule for adding or taking away shims? And how does moving from one elevation to another come into play?
Particularly 1/8 on road engine.