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#2
04-07-2011, 05:55 AM
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88 should be an Alpha 1 generation one. The top cap on the upper unit should have a flat top. Gear ratio should be stamped on the side on one of the decals. You're gear ratio snould be 1.65. IF you happen to pull the upper unit apart, drain the lube and look for small marks on the teeth, they should be timing marks(only on the 1.65), the gears will have the same number of teeth on each gear. Lower unit should have plastic insert type water pick ups vs molded in water holes. The only way to be sure you're lower is an Alpha is when you drop the lower to do a water pump, it shouldn't have a small spring loaded pin on the vertical drive shaft. If you decide to build a 5.7, you can switch to the HD 1.5 gear ratio upper gears, just know it takes specific tools to set up the gears
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#3
04-07-2011, 07:12 AM
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Spare is right the 1:5:1 HD are the gears to have AND you still have to be very very careful. Running the sticks like you are Reggie Fountain will only put lots of money in your mechanic's pocket. Personally I think the 5.0 warmed over would be plenty of motor for a V-20. Making a 300hp 5.7 is easy but with this hull I think you would be reaching very diminishing returns.
Brian
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#4
04-07-2011, 07:22 AM
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Forgot to add 1988 puts you square in alpha one generation one category but you never know what someone may have bolted on over the years. External clues are the flat top on the upper gearcase, and a squared off cavitation plate on the lower versus a rounded one. Funky drives are the lowers from 83-somewhere in 85 they will have the newer case with a square cav plate but the earlier internals, smaller shaft and a preload pin. Like Spare said you really won't know what you have until you open it up. Count your teeth in the upper gearset I have seen some 5.0 come with 1:5:1 ratios too.
Brian
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#6
04-09-2011, 08:26 AM
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I must say I appriciate the help. Most boards call the newbee nasty names when they are doing something a little different.
By the looks of things, I will for sure need to do something with this outdrive. I surmise it may not last long.
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#7
04-30-2011, 12:37 AM
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Ok, fired the engine up this evening....well, sounds healthy. Going to spark limit it to 4800rpm to possibly 5200rpm, untill I can figure out the drive situation. My biggest fear is the thing pulling up from the hull. I have it strapped down, just in case something goes horribly wrong. Man alive, this thing should be in a car
 (The gentleman has a really nice 88 7 series BMW I did for him, and keep telling him he should let me put it in that.....lol) Possibly a different drive unit altogether? What does it take to be able to reliably spin an out drive to 6500rpm? What fails? Bearings, or gears? Jet drive possibly? Or am I just off my rocker, and keep it dialed way down? (hm...way, way down)
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#10
05-07-2011, 08:32 AM
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Wowser, we took it out last sunday for a shake down run. Well, its fast, and gets on plane in the blink of an eye. The new holley carb did have a stuck float, so called it a day. Got the new digital ignition in this week, and will be heading out again tommorow to finish the engine up. Then on to the outdrive........ this 383 seems to have been a good choice.
I was going to post pics of the build, and runs but dont seem to be able too yet.
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