Mercrusier 496 MAG Upgraded NEW long blocks Base, HO and Supercharger ready

[Hardcore1]

Mercrusier 496 MAG long blocks
These engines are redesigned with stronger parts to promote longevity and fix factory weak parts that will fail due to low cost materials used!
ALL engines come with Forged pistons and Stainless steel 1 piece swirl polished valves
We have 3 stages or build please check below for exact specs

Stage1 Base 375HP & HO 425HP $7950 Exchange
496 MAG 375hp & 496 HO 425HP Heavy Duty replacement units
(we will need year of manufacture and ECU model to ensure you have correct timing cover and cam gear/sensor type, there are 3 different ones 2001-2002, 2002-2004, 2004-2009)

Blocks
we only use virgin core blocks that have STD bores for our engines, all blocks are thermally cleaned and magnafluxed, blocks are bored and honed and square decked, mainlines are checked for size and align honed as needed

Cranks
Cranks are crack tested and checked for straightness then micro polished at STD or ground 010/010

Rods
Rods are resized on 375 and 425 HP engines(these can be upgraded to 4340 H beams if engine is custom built for customer)

Pistons
ALL pistons are forged RaceTec brand and 4032 hi silicon forgings
with flat tops and deeper valve reliefs for hi lift cams Compression is 9:1 for 91 octane gas

Rings
ALL rings are Total Seal Plasma moly

Heads
ALL heads are thermically cleaned and maged, NEW stainless steel valves and a hi performance 3/4 angle valve job and re-surfaced

Cams are Comp or Crane factory grinds but upgrades are available (note ECU will need to be reflashed for any cam upgrades from stock!)

Valve Train
New Comp lifters, HD Timing set, Moly push rods & Alum/Steel full roller rockers

Gaskets
ALL gaskets are Fel-Pro and head gaskets Cometic MLS


Stage2 525HP $8750
Same specs as above but following parts are upgraded
Rods
PEP H Beam 4340 forged 6.700 long

Pistons
Racetec forged with lighter .990 pins

Cam
Custom Hardcore Racing Comp or Crane grind

Stage3 $10500
Supercharged applications with Procharger/Vortech or Whipple 600+HP(supercharger not included)
Same as stage 2 except following parts

Crank
GM (we only use micro polished STD or 010/010 reground cranks)

Pistons
Racetec dished 8:1cr

Rings
Total Seal TNT ring set for boosted/NOS engines(gapless also available)

Rods
Lunati H beam rods 6.700 long with ARP2000 bolts

Valves
Severe duty intake valves & Inconel exhaust valves

Cam
Custom comp or Crane grind for boosted applications

Other upgrades
Dart block
Dart iron eagle heads
Ported stock & dart heads
Raylar heads
Forged 4340 511/518ci stroker cranks
Dart intake with 750/850/950 Quick Fuel carb or blow-thru carb for Procharger applications

All engines are fully built to our strict marine specs at out Lake Havasu shop!

 

[Bpracing1127]

So it’s a trade in cost for your working engine?

 

[02HoWaRd26]

Stage3 $10500
Supercharged applications with Procharger/Vortech or Whipple 600+HP
Same as stage 2 except following parts


So, i give you my 496ho and 10,500$ you give me 496 with a whipple, i just need to have my ecu reflashed.

 

[Hardcore1]

So it’s a trade in cost for your working engine?

Yes price is exchange for a rebuildable core! if your core is damaged there will be a extra charge of between $200-1000 depending how bad the core is!

 

[Hardcore1]

Stage3 $10500
Supercharged applications with Procharger/Vortech or Whipple 600+HP
Same as stage 2 except following parts


So, i give you my 496ho and 10,500$ you give me 496 with a whipple, i just need to have my ecu reflashed.

The Procharger or whipple is extra! the parts list of whats included is listed

i have changed the ad to read so theres no confusion! thanks for pointing out it could be read that way BPracing1127!

Stage3 $10500
Supercharged applications with Procharger/Vortech or Whipple 600+HP(supercharger not included)
Same as stage 2 except following parts

 

[QC22]

Stage 2 seems like a legit opportunity for me. Probably one more season as is, but have a running 496 HO now. What do you say to those who believe you can't safely upgrade a 496? I've looked at Raylar and there seems to be a real hit and miss on satisfaction. Would like to hear your thoughts.

 

[Hardcore1]

Good question! as far as parts for us its a smart move to change pistons to forged as stock are Hypertectic and very brittle and crack under detonation easily! Rods are forged from the factory and ok for stock applications but make sense if you are going to upgrade the cam and make more power to use the forged 4340 H Beam rods at the same time, both these options are good insurance for your engine.

It is important to get the ECU tuned for the upgraded cam and extra HP but plenty of tuners who can do that for you once installed