2.5 question

[Merc 2.5]

I have aquired a 2.5 ff block. I have heard terminology behind liner motor and piston ported or something along lines of that.. can someone explain difference to me ,and also tell me what the ff block is. Thanks

[patchesII]

All 2.5's are behind the liner. The old 2.4's were piston port engines. The behind the liner beats it haves down. The FF block is just a late model 200 2.5. For some weird reason they've reached legend status in the last couple years with people saying they're the same as a 225 Promax and I've even seen people compare them to a 260. It's a good, solid 200. Never will be a 260 or even a 225 Promax in my opinion

[Merc 2.5]

James perry seems think different also along with another handful I've talked to ,, it actually is same porting as promax,except exhaust port, but I was just curious bout it being behind liner motor,and what the difference was with that , but if all 2.5 are then it answered my question I rekon.

[Capt.Insane-o]

They can be made into a PM very easily or a 260 easily with some chest work, and dealing with front half restrictions.

[Merc 2.5]

Yeah James perry has it right now ,thanks to bullet 123. Great great guy deal with by the way. If anyone needs sum parts or sumthin. I gonna run 4 pedal and wh22 or 46s. Not sure which would b better. I understand 46s came on most BP carb motors

[Merc 2.5]

Would stock jetting on one those carbs a good place start of should I go bigger? I thought I read it mite not need as big of jetting as a Piston ported motor? Am I way off on that? lol

[patchesII]

I think the transfers are different too.

Wouldnt know jetting. Never messed with carbs. Surely James Perry can tell you what to run

[nitro_rat]

Surely James Perry can tell you what to run

[Merc 2.5]

Thanks guys I'll ask him what he thinks, I'm pretty sure there's few guys out there with close same setup ,so maybe they will read and chime in

[Capt.Insane-o]

James knows his sh*t, your in good hands with him