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Old 10-26-2011, 05:35 PM
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You`ll have to confirm what year the block is, if it`s a pre 1968 block it`s a small journal crank and I don`t know of any small journal 350 cranks out there. Usually 9.5:1 is the safe limit on pump gas, but those of us adventurous enough to set a tight quench distance can get away with 10:1 compression. The 492 are decent heads, however, they don`t have hardened exhaust seats for use with unleaded gas if you didn`t have it done. In time the valve will pound away the seat. You can use a additive called lead substitute that comes in a bottle that does a little to help but not much. But using a bottle of it at every fill up gets expensive. If I were you I would sell the camel back heads and get some vortec heads. Vortecs are 30 horses over the camel backs.
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