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Thread: serpentine and hotwire conversion 3.5

  1. 21st February 2012, 02:17 PM #11
    bee utey's Avatar
    bee utey
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    There are 3 different crank noses. 3.5/3.9 with dissy driven oil pump, then the 3.9 serpy engine, then the 4.0/4.6 version. If you fit a serpy front to the 3.5 the existing key won't drive the front pulley. (The 4.0/4.6 crank needs a spacer under the crank bolt to do up.) I extended a short keyway recently, no big problems. Thread with pics here:

    Fitting a '92 3.9 RRC motor into a '94

    Also shows which hole needs drilled for the a/c and alt mount, boss is there, just needs drilled and tapped. Another needs upsizing from 5/16 to 3/8.
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  2. 21st February 2012, 02:34 PM #12
    PhilipA
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    OK now somone has established it is post jan 1994 ,if you use the 3.9 heads you will have to use composite gaskets. IMHO you should also use ARP studs instead of the stretch bolts.

    All the early " interim" engines had 14 holesin teh block but 10 hole heads and composite gaskets.

    Just a comment. if you are willing to pull out crankshafts etc , then it is not much more to have the 3.9 block top hatted. My assumption at the the start was that you were looking for the easiest replacement, and I am sure you can use the 3.5 as is, except now you have to grind a crankshaft keyway.
    I warn you that once you start pulling apart one engine to use bits in another , it is Pandoras Box.

    Regards Philip A
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  3. 21st February 2012, 05:25 PM #13
    theg
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    cheapest option

    Maybe its the best option to just bolt in the 3.5 with the flapper and its computer and belt and pulley system . Ive got all the accessories incl air compressor and power steer pump and alternator with the 3.5 . then sell all the serpentine gear and 3.9 alt etc!
    How much less power does a flapper 3.5 have compared to a hotwire 3.5 .
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  4. 21st February 2012, 07:59 PM #14
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    bee utey
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    Quote Originally Posted by theg View Post
    Maybe its the best option to just bolt in the 3.5 with the flapper and its computer and belt and pulley system . Ive got all the accessories incl air compressor and power steer pump and alternator with the 3.5 . then sell all the serpentine gear and 3.9 alt etc!
    How much less power does a flapper 3.5 have compared to a hotwire 3.5 .
    Bolt the 3.9 inlet manifold on and run the 3.9 hot wire setup. Its far better. It will run OK. The keyway is doable, took me 1 hour. If you freshened up the 3.5 with a timing chain, manifold and head gaskets you can use the 3.9 heads. All depends on your budget as to how far you go.
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