Ferrari 308 2 Valve Engine Build Thread

Hi guys,

I'm currently rebuilding a 2 Valve Ferrari 308 engine US Spec, from a previous thread I got a number of pointers so I appreciate this immensely. Through this thread I intend to post updates on my progress, ask for advice , and have fun whilst we're at it.

The intention is to remove all the emission parts and convert the engine to perform somewhat similar to a European one or better!

I am based in Europe.

Engineering

From what I've seen this is what I think will need tackling:

• Bottom End:
  1. Crankshaft balancing
  2. Crankshaft - Possibly grinding new journals
  3. Conrod Balancing
  4. Honing - Cylinder Liners
  5. Boring - Possibly might be needed since two cylinders had some rust on them
  6. Engine Block Resurfacing - Possibly might be needed
  7. Flywheel Balancing
• Top End:
  1. New Valve Guides install
  2. Recut New Valve Seats
  3. Cylinder Heads Resurfacing

Parts

As much as possible I tried thinking and listing everything which I think will be needed:

• New:
  1. Pistons - 10.5:1 High Compression Pistons (possibly Larger Bore) with new Gudgeon Pins and Rings
  2. Freezer Plugs
  3. Camshafts - Fast Road Camshafts
  4. Valves
  5. Performance Valve Springs
  6. Valve Stem Seals
  7. Valve Guides
  8. Full engine gasket set
  9. Full engine oil seal set
  10. Con Rod Bearing Set
  11. Main Bearing Set
  12. Thrust Bearing Set
  13. Clutch Kit
  14. Custom exhaust manifolds and backbox
  15. Cylinder Liner O Rings
  16. New Bearings, for timing belt pulleys etc
• Reuse old ones:
  1. Conrods
  2. Conrod Bolts
  3. Cylinder Head Studs (I don't intend to remove them from the engine)

Tests

As we go along I intend to perform the following tests prior to start up/installment:

1. Valve Seat Sealing Test
2. Leakdown Test
3. Compression Test

After approximately 1 month since the engine was taken out of the car I finally had the change to start wrenching on the engine. The engine is fully dissasembled with the excemption of the cylinder heads! I intend to tackle these sometime this coming week.

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Everything is out, labelled and referenced in a database:
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Car is Carb from factory, ngl I'm inclined to going Injection with a set of ITBs however at this stage I think I'll go with carbs, if it proves that it's impossible to tune I will certainly be going ITBs. I have a Fiat with a Lampredi Twin Cam which I recently swapped out its IDFs with a pair of Jenvey Heritage ITBs, I'm also planning the same on a vintage Alfa Nord Engine. Both will be running on a Microsquirt ECU. So it definitely won't be the first.

 

Thanks for the tips! Did you bore the liners inside the engine block or outside? And did you change the o-ring?

On another note does anyone know the minimum allowable thickness for the cylinder head and from where to where I should measure mine?

 

I definitely want to remove the minimum amount possible hence why I'm asking so that when I take it to the machine shop I can emphasise and confirm that the least possible is removed.