Many torque specs can be transposed. the key is to know what other similar models are there. A torque speck is the safe limit to witch to tighten a bolt. so if you can find the similar torque on a similar engine that does not seem too high I would start there. if it is an all cast iron engine I would try 95 foot LBS but is it is Aluminum I probably would not go over 25. Just saying. the torque is also directly related to the compression of the engine and the compression is directly related to the octane required, if you are not required to burn high octane then you have a low compression engine and most likely a low torque speck and if it is an aluminum head and block the very more likely very low torque.
best of luck
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