can you tell by the smell?

Can anyone tell me how to tell a 2.25 from a 2.5 petrol engine. Is the capacity stamped on the block or is the 2.5 engine number the identifier?

by engine number, it's even stamped in a different place!
From memory the 2 1/4 (or 2.3 in Ninety speak) has it stamped just below the join between the head and the block, the 2.5 has it stamped running down by the join between the block and the front plate (the bit the water pump bolts to).

Thanks for the info. Yippee I have a 2.5 in me old SIII. Time now to invest in a turner head.

Why do you want a Turner head? Remember 2.5s can take unleaded from the factory.
I was working from memory, so you might like a second opinion before spending money.

2.5s are all 5 bearing cranks and have cross shaped reinforcing ribs on the side of the block.

I heard that turner stage 1 heads make sense in terms of better pulling power making the Landy a more viable option in todays traffic and when towing. I do a fair bit of towing. I also intend to go for an lpg instalation hoping that a combination of the two will be almost as good but more origional than a 200tdi swap. I like the petrol engine anyway.

don't forget as you have a series you have a tow limit of 2000kg rather than 3500kg of the coil sprung landrovers

yeah the extra capacity of a coiler would be handy but I can get by with a two ton limit for the love of my series 3. As a joiner handyman type of self employed person I lay concrete slabs for sheds and garages and if I need more than a couple of tons for a job I get it delivered. The extra oomph of the turner head will come in handy on the hilly twisty narrrow roads up here in the Outer Hebrides.

I suspect that a Stage 1 head would just be a skim, something that you can get done at a number of other places, just check your yellow pages

I checked out the Turner website. they recon the heads are 8:1 comp ratio and gas flowed. The testimonials look impressive, think Ill start another thread about turner heads see what the good folks online reecon. Apart from having a soft spot for petrol series Landys, going for a petrol with lpg is bound to be cheaper for insurance as it represents less of a conversion than a 200tdi or an Isuzu Daihatsu Toyota etc conv.

if your going gas conversion you can ramp the compression ratio up to about 11:1 or 12:1 safely if you only run gas as it has a higher flash point, also look into going distributor less ignition(keep the dizzy in place tho) using a mega spark (like mega squirt but runs a ford coil pack ) it will afford you better ignition timing control