Seems like I read somewhere that the Gen V/VI 454 mag (forged crank & pistons) takes a different flywheel than the 7.4L with the cast internals. However, I need part numbers for both so that we can verify which flywheel we need versus what we already have on hand. Boat came with twwo cast crank motors in it, but it was kind of cobbled together so I don't want to assume that the correct flywheel was used.

Thanks for any help!

1992 to 1994 the crank is part number 429-811551 and the flywheel is part number 230-811562T (old number 230-811562) GEN V
1995 to 1996 the crank is part number 429-8550 and flywheel is part number 230-6540 GEN V

Later GEN VI
Flywheel 230-843374T1 (old 230-811561) Crank 429-811552

Thanks AllDodge. Same flywheel for both cast and forged cranks?

Budman II - I'm seeing different part numbers as listed above. I'm no expert, just looked up all models and wrote down the part numbers. Part numbers are he same for all GEN VI but not GEN V
Additional info can be found at www.mortec.com that is listed below. but this is crank info. They also have block, head and other info

TWO PIECE REAR MAIN OIL SEALS
4.00" STROKE used on '70-90 Mark IV 454 or Mark IV 502

3520.......454...forged, cross-drilled, 1053 steel
3521.......454, 502...forged, cross-drilled, 5140 steel
3524.......454...forged
7416.......454, 502...forged, cross-drilled, 1053 steel
7463.......454...forged
336782.....454...cast
353039.....454...cast
353638.....454...
359730.....454...
3962523....454...forged
3963523....454...
3963524....454...forged
3967416....454...forged
3967463....454...forged
3975945....454
3963521....454...forged, cross drilled, 5140 steel
3965753..........semi finished, forged, 5140 steel
3975495....454
3993878....454...forged
10051169...454...forged raw casting


ONE PIECE REAR MAIN OIL SEAL
4.00" STROKE used on '91-up Gen.V and VI 454 or 502

10114188...454......cast
14097044...454,502..forged, 1053 steel

Hello, I am also trying to verify if the crankshaft i have is a forged casting and if my rods are the hi-po type and if pistons are forged, it is a gm crate 454 4 bolt main ( for sure i got pan off) and has a tag saying manufactured for gm with p/n 88890529 and a casting on block of 12550313, this is not on the mortec list, any help greatly appreciated

Hello, I am also trying to verofy if the crankshaft o have is a forged casting and if my rods are the hi-po type and if pistons are forged, it is a gm crate 454 4 bolt main ( for sure i got pan off) and has a tag saying manufacrured for gm with p/n 88890529 and a casting on block of 12550313, this is not on the mortec list, any help greatly appreciated

Sorry I posted that twice, tried to delete

If this is your crate engine spec'd as per the GM P/N 88890529, click on link and then "see more specs". If you engine was a crate engine or salvaged, as a reference, we had a suburban 7.4 L from that era of engine (pre vortec) and they were only 190hp or 230hp for the Alu heads - cast cranks
https://www.summitracing.com/parts/n...90529#overview

I did see that summit engine, and the short block i have did have aluminum heads ( and the 1st pieces taken off & sold) and the upper summit description of engine says internally balanced, then as u read on it says externally balaced, but also says unavailable. Im thinking i read somewhere that the internal balance aluminum head was cosidered performace ( if 220 hp qualifies, lol) but has steel crank and dimple rods????? Or am i just dreaming

you have to visually inspect everything inside the pan - what it started out as may not be what it is in its current rendition...

Cast vs forged identification -