![]() 1996 Vortec heads came into play and most of the small blocks ran in the 300 hp range. Shortly after that (1994 or so) the Magnums EFI motors had a slightly (and I mean slightly) bigger cam sometimes referred to the GM 395 cam with the hp upped to 265 but this was measured at the prop vice crank. It was likely 260 hp at the crank (235 hp at the prop). It is most likely your block is a late model 1pc rear main seal, two bolt main, possibly hyd roller motor, but likely flat tappet with standard heads. The Magnum monicker was never directly related to an MPI motor, but an MPI motor could be a Magnum. From the Magnums I've torn down in the small block realm none were forged and none had 4 bolt mains. ![]() I've heard claims of forged internals etc. For the most part the differences were (are) minimal. Now to your question at hand the biggest difference between a standard 350 and a 350 Magnum (or 5.7 and 5.7 Magnum) was typically a mild bump in the cam and perhaps compression. Later on the 350 began to get the label as 5.7 but was the same basic motor. Sometimes the name was attributed to HP rating, sometimes not. We all know the basic motor as a 350 cid small block Chevy that has had various MerCruiser names over the years. I don't believe the 5.7 terminology was used in 1989 for the small blocks. First off, if you get the serial number off the motor that will tell you the most.
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