Agree with rwb that it could be a 327. As you may know, Dave,small block Chev engines like yours are for the most part identical externally...from a 265 to a 400 they Do look much alike with some small differences depending on the year of manufacture. The should be a smooth machined surface on the front of the block with some stamped numbers. This number/letter combination will give you the engine code which from then can be determined the engine designation, which will tell you it's displacement, carburation, compression ratio and application.....given the age of the truck, the engine could have been replaced at one time, and without the code, it's anybody's guess to its origin. Good hunting!
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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