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  #1  
Old 11-26-2012, 01:53 PM
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5.7 Litre Vortec MX Plus

Can anyone tell me if my 1998 350 C.I.D Vortec 5.7 Litre MX Plus is an Indmar conversion? The exhaust manifolds say Mastercraft Power.
Also do I have the flat tappets or a roller cam?
Thanks
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Old 11-26-2012, 02:29 PM
FrankSchwab FrankSchwab is offline
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Well, I have an MX Plus in my boat, and it is certainly an Indmar conversion. I have no idea what the valve train looks like, and I hope to never have a need to look into it.

What information are you looking for?

/frank
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Old 11-26-2012, 02:38 PM
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I'm new to Mastercraft and most that I've seen say Indmar on the engine. Mine says Matercraft Power on the manifolds. So I thought I'd ask. As far as the roller cam goes, I saw that a pre 1998 had flat tappets vs. the rollers. Less wear as far as I know.
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Old 11-26-2012, 04:39 PM
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east tx skier east tx skier is offline
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The MX is a throttle body injected Indmar conversion. It has Vortec heads, and the consensus is that it has a roller cam. I just winterized one this past weekend. Great, torquey, reliable engines.
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  #5  
Old 12-12-2012, 08:22 AM
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Is there a way to confirm that?
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Old 12-12-2012, 10:11 AM
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+1 on what East TX says. I have a friend at Indmar - will ask and let you know.
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  #7  
Old 08-24-2017, 09:58 PM
fstaslp fstaslp is offline
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so is this engine a 310hp or a 330 hp?
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Old 08-25-2017, 09:21 AM
Cumminscj Cumminscj is offline
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It's the throttle body motor so it's not 330hp. I thought I remembered the tbi motors putting out 290 around this year but I would imagine someone will chime in who knows for sure
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Old 08-25-2017, 03:26 PM
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Quote:
Originally Posted by fstaslp View Post
so is this engine a 310hp or a 330 hp?
My '98 is rated at 298hp
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  #10  
Old 08-25-2017, 03:36 PM
fstaslp fstaslp is offline
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Thanks! This is an eye opener, I always thought it was an odd engine, but now I know it's just a predator.
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