i've used hylomar before, if the head is machined properly and the top of the block is nice and clean, theres not much point, not with these if u use a quality head gasket.
i would also suggest a new set of spark plugs if it isnt on ur list .. gas is harder to ignite then petrol, on a side note i have seen a tb45 on gas, they only ran gas and no petrol, gummed up some valves and it dropped the push rods.... use some petrol to keep the carby working and valves clean .
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