Merc 200

[Glastron1987]

Just picked up a 2002 Merc 200. Compression good on all cylinders.

The block has an "F" marked on it, not "FF" as I would have expected. However, it does have O-ring heads.

I thought the "F" was only for 1991 engines.

Did Mercury use "F" blocks in more than 1991?

How would this "F" block compare to the "FF" block?

[LakeFever]

Block or power head probably replaced. Does it have head gaskets? 02 should b o-ring. F block is a small chest like an EE that came with a 7 petal front half. There’s no bad 2.5, they’re all great. Even the notched sleeve XR6 motors really move out

[OnPad]

Mercury used F stamp for the later o ring blocks also. The newer F version should be very similar to a FF block, except the deck is taller.

[LakeFever]

I learned something new today

[skialot2]

I have a 2000 2.5 200 carb motor and a 2001 2.5 200 EFI. The carb motor has no markings. The EFI has a 05 replacement block. It is marked F. I see no difference between them. The FF block I have looks the same except, like OnPad said, the deck is slightly shorter because it uses gaskets, not Orings. But I am no expert on what the differences are to look for them. I am planning to use the exhaust cover from the FF block on the F block because I switched the ignition to switch boxes from CDM. Wasn't the term "Fat block" only used during the transition from 2.4 style to 2.5 style motors?

[OnPad]

My o ring block stamped F is also factory reman.

[LakeFever]

I have a replacement block CC that’s a large chest with the FF/promax sleeves. Who knew?

[mercrazy]

What’s the difference in a large chest and small chest?

[LakeFever]

What’s the difference in a large chest and small chest?

https://www.screamandfly.com/showthr...detail-finally

[Glastron1987]

Block or power head probably replaced. Does it have head gaskets? 02 should b o-ring. F block is a small chest like an EE that came with a 7 petal front half. There’s no bad 2.5, they’re all great. Even the notched sleeve XR6 motors really move out

O-Ring

[25two.stroke]

F stamp 7 petal 1991 is not the same block as the later 2000&up F stamp which was an oring version of the FF. 200 hp

[Aaronhl]

F stamp 7 petal 1991 is not the same block as the later 2000&up F stamp which was an oring version of the FF. 200 hp

Nice do u think the insides are the same between mid 90s FF and yr2000 F?

[25two.stroke]

Nice do u think the insides are the same between mid 90s FF and yr2000 F?

Yes

[LakeFever]

The o ring blocks have a taller deck iirc

[Baker343]

F stamp 7 petal 1991 is not the same block as the later 2000&up F stamp which was an oring version of the FF. 200 hp

Bottom guided and small chest too