![]() ![]() ![]() The Mag used CH secondary rods which are short tips and the 5.7 and 305 used CL rods, which are Long tips. Propshaft Horsepower: 300 (224 kW) Displacement (Liter/CID): 5.7L/350 Cylinders: V-8 Bore & Stroke (inches/mm): 4.00 x 3.48/101 x 88 Compression Ratio: 9.4:1 Fuel System: MPI Full Throttle RPM Range: 4600-5000 Ignition Type: MEFI/EST Digital Alternator (amps/watts): 65/917 Length (inches/cm): 37/94. The Mag uses the smallest primary jet (069) and a 039 rod (I think) whereas the 5.7 uses a 070/042 set up (the 305 used a 070/041, which is richer - go figure). Merc set up the 5.7 and 350 Mag Qjets differently on both the primary and secondary sides. (Actually, some 5.7 BIIs may have used the roller as well) Mag uses the Z-28 cast iron hi-rise manifold, which is available from GM Performance Parts (and is better for a RWC boat than a Performer!, IMO), and a roller cam. Unfortunately, I threw away my '92 5.7 stock cam before I measured the lobes.ĥ.7 and Mag both use 76cc crate motor heads (non-swirl), 0.025 deck height, and 4 valve relief, slight dish pistons, and small valves (1.94/1.5). I can definetly tell you that comp cams XM 258(?) is a stronger than stock cam for the 5.7. I've heard from some hotboaters that some of the info may not be completely accurate and the cam specs on the 5.7L and Mag were at the top of the list. Moore's book is a great help and I highly recommend it.
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