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Whipple for a Merc 7.4l MPI?

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Old 04-14-2007, 04:23 PM
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Default Whipple for a Merc 7.4l MPI?

Do they make a whipple for the Mercruiser 7.4l MPI? Or what about prcharger. i have searched google and so forth but cant find any. Thanks
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Old 04-14-2007, 05:21 PM
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Yes they do. It runs very well with that blower too...
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Old 04-14-2007, 05:25 PM
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Whipple took the kit off there web page, they use to offer one, you might call them and see, the 7.4 [non mag] motors had cast pistons so you will need a low boost setup. [like 3 psi]
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Old 04-14-2007, 05:29 PM
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cast pistons ehhh....what about the rods?


3psi might not even be worth it...
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Old 04-14-2007, 07:53 PM
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set up is the key to making the engine live, if it is set up properly you can get some good power out of it. the non mag 454's had 4 bolt main block, forged rods with 3/8" rod bolts and cast pistons,
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Old 04-15-2007, 01:24 AM
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That motor has a cast crank, 3/8 rods and cast pistons. If you are going to supercharge it, keep the boost very low. Like H2XMark said, no more than 3 or 4 psi if you want it to live a while. Eddie
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Old 04-15-2007, 08:15 AM
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If it didnt have a cast crank i would of thought about it...Id rather have the engine around a little longer...
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Old 04-15-2007, 10:00 AM
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just for kicks anyone have a S/C 7.4l MPI (non mag) engine...how many hours on her and how much psi?
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Old 04-15-2007, 06:38 PM
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You could run either brand on that engine. There are kits available. We sell both kits. HOWEVER as already mentioned the internals are not forged which can spell trouble under pressure.. If you do add one of these to this engine dont get greedy with the boost, or it can really be a short lived power experience.. Hope this helps.. Jamie / Lakeside

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Old 04-15-2007, 11:24 PM
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How much for a non polished Whipple? you can PM if ya want. Thanks
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