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Old 11-05-2011, 10:27 AM   #1
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Default Adding shims?

When you raise to a higher nitro percentage do add or remove head shims?
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Old 11-05-2011, 10:33 AM   #2
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Quote:
Originally Posted by JDOM111 View Post
When you raise to a higher nitro percentage do add or remove head shims?
You add shims.

Which engine are you running?
What nitro % are you switching to?
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Old 11-05-2011, 03:06 PM   #3
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359 tuned that is drag modded.moving up to 40 or maybe even 55%
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Old 11-05-2011, 03:27 PM   #4
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Possibly two silver shims and one copper shim. I may be incorrect. Hopefully someone will come in and provide more 411. Goodluck.
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Old 11-05-2011, 04:54 PM   #5
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Add shim
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Old 11-05-2011, 05:07 PM   #6
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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!!
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Old 11-08-2011, 02:34 PM   #7
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Default .21 head shim

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.
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