Thread: gas and valve questions 327/ 350 HP

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93 oct or higher. Additives are across the board pretty equal. Cleaning agents are the biggest difference in these products.There will be a political storm now that I've stated that. Don't pull back on fuel ratios Carburation specs) to save gas. It creates havoc with pre detonation and unstable combustion. If you wish to get a jug of av gas or race fuel mix it in to your gas with small amounts. Maybe 5:1 ratio (5 gas :1 race). You mind it is a bit much to start but as you play you'll find your solution.