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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! |
Serial# is not correct/working.
When you get it correct, you can plug it into here: https://www.mercruiserparts.com/ |
Go to Mercury's online parts and enter you serial number .
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Originally Posted by Steve888
(Post 4660610)
My SN is K283301. Thanks!
Okay,you where missing the 0 in front.So use: 0K283301 |
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? |
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 |
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 |
Originally Posted by Crude Intentions
(Post 4660647)
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 |
If it’s cast it’s a non mag. Almost certainly. |
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. 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 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 |
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