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iTrader: (1)

what power are they good for were would you say border line is with this block

Steve Whitehorn

iTrader: (13)

My understanding is

Standard 2.5 block is semi closed.
All the forged internals - headstuds and the like
make it fine up to 500hp.

Many take it beyond 500 - I guess 600 would be pushing it.

I expect someone with more specific experience will post soon

Steve Whitehorn

iTrader: (13)

I would add
For people going this route, you need to also think about the big torque an engine like that makes and double your budget to include a six speed box a decent clutch and big brakes to cope with it all.

Mus

iTrader: (2)

ecu
turbo
coilovers
brakes
injectors
headers
some people say 450 some 500 and some near 600, theres loads of threads about forged 2.5 limits

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iTrader: (1)

i,ve got the block but i,am looking at selling it so just want the info to back up the sale thanks guys

harvey

iTrader: (48)

The O/E pistons need changed before you do much atall. The rods MAY be safe to 450 bhp, perhaps a little less and to avoid head gasket issues beyond that you need to look at head fastening.
The block itself????
I have seen plenty with oval bores at not a lot of boost.

New_scooby_04

iTrader: (4)

My understanding is that the unmodified block is good for a circa 450/450 car (assuming appropriate supporting bits) e.g. Rods, Pistons, head studs etc... and a turbo running sensible levels of boost. Beyond that and you're in the realms of uncertainty.