View Full Version : 5.7 Litre Vortec MX Plus

11-26-2012, 01:53 PM
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?

11-26-2012, 02:29 PM
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?


11-26-2012, 02:38 PM
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.

east tx skier
11-26-2012, 04:39 PM
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.

12-12-2012, 08:22 AM
Is there a way to confirm that?

12-12-2012, 10:11 AM
+1 on what East TX says. I have a friend at Indmar - will ask and let you know.

08-24-2017, 09:58 PM
so is this engine a 310hp or a 330 hp?

08-25-2017, 09:21 AM
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

08-25-2017, 03:26 PM
so is this engine a 310hp or a 330 hp?

My '98 is rated at 298hp

08-25-2017, 03:36 PM
Thanks! This is an eye opener, I always thought it was an odd engine, but now I know it's just a predator.