5.7 Litre Vortec MX Plus

[Snipe]

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

[FrankSchwab]

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

[Snipe]

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]

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.

[Snipe]

Is there a way to confirm that?

[mikeg205]

+1 on what East TX says. I have a friend at Indmar - will ask and let you know.

[fstaslp]

so is this engine a 310hp or a 330 hp?

[Cumminscj]

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

[Snipe]

Originally Posted by fstaslp

so is this engine a 310hp or a 330 hp?

My '98 is rated at 298hp

[fstaslp]

Thanks! This is an eye opener, I always thought it was an odd engine, but now I know it's just a predator.