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Old 12-29-2010 | 11:59 AM
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EBMods
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Originally Posted by addicted427
I HAVE AN OLDER MODEL SPEED ENGINE AND WANTED TO KNOW THE THINKNESS OF THE SHIM NEEDED TO RUN 25% NITRO...
For the older OS engines they should have a total of 0.012" / 0.3mm worth of shims. Giving you a NET head clearance of 0.016" / 0.4mm. With this shimming your good for 30% Race Fuel with 7%-11% oil content in the USA.
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