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(Post Link) post #18 of Old 1 Week Ago Thread Starter
mj2k
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So in summary...

164 3.0 12v -> 75 3.0 12v (and vice versa)
Almost everything will swap over, including the pump / distributor / sump with no issues as long as you have a donor engine with the correct flywheel, ancillaries, etc

Alfetta (or 75?) 2.5 12v -> 164 3.0 12v (and vice versa)
Ditto. But you'd need to swap the crankshaft (giving you a low compression 2.8) or create a 4mm spacer and get the flywheel balanced with the 3.0 crankshaft / pulley to avoid the engine becoming unbalanced if you used a 2.5 flywheel, and you would need to fiddle with the starter mounts to ensure it lines up correctly.
Pistons / heads of course won't swap over because the engines have a different bore, but conrods are fine

75 / 164 3.0 12v -> later type 3.0 24v (from 916 GTV, 166, etc)
  • Pistons won't swap (different cutouts) but conrods will.
  • Heads won't swap without work (you'd end up with a big hole in the left hand head where the oil pump drive went, which would need closing up)
  • Crankshaft / sump will swap, but you'd need to fit the appropriate front cover and you'd need to create some alternative oil pump drive / pickup using a dry sump pump.
  • Water pump / waterways should fit with a little adjustment (see above posts)
  • Timing belt detensioner won't fit - it'd need a feed from an oilway, which probably isn't routed in the same place on the later 24v block
  • Ancillaries might need new mounting holes drilling but should work with the correct front pulley

Later type 3.0 24v (from 916 GTV, 166, etc) -> 75 / 164 3.0 12v
  • Pistons won't swap (different cutouts) but conrods will.
  • Heads won't swap without a lot of work - you'd end up with a big hole in the crankshaft where the oil pump drive went, which would need closing up, and you'd need to create some alternative oil pump drive / pickup using a dry sump pump.
  • Crankshaft / sump will swap, but you'd need to fit the appropriate front cover and you'd need to create some alternative oil pump drive / pickup using a dry sump pump. Also you'd need to knock off the oil pump drive cog and create a shim / spacer to replace it
  • Water pump / waterways should fit with a little adjustment (see above posts)
  • Timing belt tensioner will fit, just a matter of blocking off the 12v tensioner's oil feed
  • Ancillaries might need new mounting holes drilling but should work with the correct front pulley

164 3.0 12v -> 164 3.0 24v (and vice versa)
  • Ancillaries might fit (unknown)
  • Conrods will fit
  • Oil pump will fit if it's driveshaft is swapped
  • Almost no other parts in common, and block is sufficiently different to make parts swapping tricky

164 3.0 24v-> later type 3.0 24v (and vice versa)
  • Conrods will fit. Pistons might fit (unknown)
  • Ancillaries might fit with appropriate pulley swaps (unknown)
  • Almost no other parts in common, and block is sufficiently different to make parts swapping tricky

Alfetta (or 75?) 2.5 12v -> later type 2.5 24v (from 156, 166, etc) and all other combinations
Not tried, but presumably will be a mixture of 2.5 12v -> 3.0 24v and 2.5 12v -> 3.0 12v, etc. Doubt it'd be worth all the work though...

Weird how the early 3.0 24v is so different to the rest, maybe that's where the commonly held view that there is virtually no parts commonality between Busso generations came from.

Last edited by mj2k; 1 Week Ago at 11:53.
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