Hello Chris,
if in your engine is stamped A112 A5.000, this is not a HP-58 or HP-70 engine ! This A5-engine has a capacity of 902,576 ccm (65 x 68 mm) and a compression ratio of 9,0:1. This engine has a power of 42 hp / 5400 n/min. This engine has been placed in the A-112 models "Economica" and "Normal".
If you are looking for a real Abarth-A-112 engine, you have to look for a block with A112 A1.000 (HP-58) or A112 A2.000 (HP-70).
The A-112 or Fiat 127 waterpumps are always the same ones, there is no difference. We do need in our race cars electric waterpumps. See
www.isa-racing.de [nofollow] , page 221. Our clubfriend Ad van Koeveringe/NL (aneko.home@hetnet.nl) produces a perfect adapter from alloy to fit this pump to the A-112 engine. Ask him.
With best regards,
Klaus Kleber
Promoter ABARTH-COPPA-MILLE