Need some help identifying which 7.4 I have
11-23-2018 | 04:27 PM
#1
Thread Starter
Registered
Joined: Nov 2018
Posts: 86
Likes: 4
Need some help identifying which 7.4 I have
I recently purchased a 98 Baja 24 Outlaw with a 7.4. I went to marineengine.com to look up some info on the the 7.4. The website lists a 7.4 TBI, a 454 Mag, and a 454 Mag MPFI with the serial number range that matches my engine, but I don’t believe the engine in my boat is any of them. My engine is a 7.4 carbureted motor that appears to be the base 7.4, but I am a little confused since that combo isn’t listed on marinerngine.com as an option. My SN is K283301. Thanks!
11-23-2018 | 04:41 PM
#2
Registered
Joined: Nov 2004
Posts: 14,068
Likes: 3,667
From: On A Dirt Floor
Serial# is not correct/working.
When you get it correct, you can plug it into here:
https://www.mercruiserparts.com/
When you get it correct, you can plug it into here:
https://www.mercruiserparts.com/
11-23-2018 | 04:57 PM
#5
Thread Starter
Registered
Joined: Nov 2018
Posts: 86
Likes: 4
I put the SN in the Mercury Marine site and it says that it’s a Gen V 454 Mag. The spark arrestor cover says 7.4 ThunderVolt Ignition and I read online while I was searching that the 454 Mag was labeled as such and the non Mag motors were labeled as 7.4’s, is that correct?
11-23-2018 | 09:53 PM
#6
Thread Starter
Registered
Joined: Nov 2018
Posts: 86
Likes: 4
I went out and got the casting number off the block and it is for sure a Gen VI motor. The marineengine.com site lists the 454 Mag as being the only engine available with a carb for 96-97 model years. Is there a way to tell a Mag from a standard 7.4 externally? Thanks
11-23-2018 | 10:12 PM
#7
Registered
Joined: Mar 2012
Posts: 4,189
Likes: 55
From: Cape coral, FL
Check the intake with a magnet for starters. Cast (magnet will stick) it’s not a mag. Aluminumis a mag. Also pull valve cover and check head casting. That will tell you what heads and definitely tell you if it’s a mag or not
11-23-2018 | 10:25 PM
#8
Thread Starter
Registered
Joined: Nov 2018
Posts: 86
Likes: 4
11-24-2018 | 03:34 AM
#10
Registered
Joined: Nov 2010
Posts: 284
Likes: 3
0K283301 = 1997 MERCRUISER TB5, W/PS, TWOPCEX, WORO, GEN-6 7.4L BRAVO Model Number 474B110KS...So it shouldn't be a Mag from new.
Do you have a bravo 1 or 3 stern drive as some of the 3's had a high rise intake but mostly Gen 5's are mentioned in the I'd link above.
Carburetor & Flame Arrestor for Mercruiser (7.4l Bravo I, Ii, Iii, Engine) Engine.
Mercruiser (7.4l Bravo I, Ii, Iii, Engine) Engine Components
7.4L BRAVO I, II, III, ENGINE
https://www.perfprotech.com/mercury-...og/umodel/1528
GM V8 454 cid Gen VI with Roller Lifters. Sterndrive, Ski and Inboard Models (4 bolt mains, LH rotation). 7.4L (carb) XW 1996-1997, 6WX start of Gen VI, Bravo. 14 (356)
http://www.boatfix.com/merc/Bullet/97/97_06.pdf
http://www.boatfix.com/merc/Bullet/97/97_06.pdf
Carburetor & Flame Arrestor for Mercruiser (7.4l Bravo I, Ii, Iii, Engine) Engine.
Mercruiser (7.4l Bravo I, Ii, Iii, Engine) Engine Components
7.4L BRAVO I, II, III, ENGINE
https://www.perfprotech.com/mercury-...og/umodel/1528
