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Discussion Starter #1
I have a Giulia allready converted with a 75 TS.

I run an Omex ECU and throttle bodies.

156 bhp measured on the rolling road.

It runs great, but does give white smoke under heavy load/when backing off, probably worn valve stem seals at a guess?

I am planning on buying another TS engine to start a performance build on it, so I can take it nice and slowly and still drive the car.

Should I just go for another 75 engine as a base?

I have been offered a 1992 155 engine also.

I understand cars with coil pack DIS ignition from the factory have quite a few differences in the engine block?

Basic plans for engine so far:

Head Work and larger valves
Different cams and pistons
Different valve springs

What else should I add to the list?

I would like 180-200 BHP.
 

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2.0TS 155 engine (engine code AR 67202) will have a longer stroke crankshaft 90mm (instead of 88.5mm of 75TS engine), so the rods are shorter and pistons are different. Crank does not have spigot bush...

155 block has oil squirters under pistons which AFAIK 75TS does not have.

155 block is a little different where the oil pan bolts up, so the 75 sump wont fit without modification (original 155 sump won't clear steering rack - at least in 75 engine bay).

Front cover (chain cover) is different (water pump and oil filter location changed), and most likely won't work in rwd engine bay, because of the oil filter location (can be changed to a 75 cover as far as I know).

Head:
intake is angled up on 155 head slightly and 75 intake manifold won't fit on 155 head.
No place for a distributor of course. The thermostat housing is at the back of the head, so might have to deal with interference with firewall, and cooling hose routing will be different. The VVT oil channels in intake camshafts are different from 75 and VVT is actuated differently (cams are otherwise the same as far as I know) - most likely for the power target you are looking for, the VVT will be disabled anyways and cams won't have these oil channels.

If I was in your position, I would want a 155 crank in 75 block and use 155 head on it. As far as I know this is also the recipe that some shops in UK and Germany use to get higher performance TS engines (with custom pistons and cams)...
 

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Discussion Starter #4
Thanks guys. So maybe the answer is that I need both a 75 and a 155 engine for parts, placing the 155 crank and 155 head on the 75 block.

No doubt it's not quite plug and play....

Is there much machining needed?

Here is my engine as it is at the moment:



 
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