Block numbers

[colr6]

I’ve got a block 1600 crossflow with numbers I ain’t come across before, any help would be appreciated. Did come across this on another forum can anybody confirm This,    
                                                                                                                                                                                    

The block numbered 831c 6015R34  This is an early AX thick walled motorsport block,used here in England in formula ford.The AX letters are cast where the 831c is stamped.They were manufactured here for motor sport in the 1980s.831C then became the thick walled AX block manufactured in Port Elizabeth South Africa until 1994.I have 2 in my garage they will bore out to 86mm 1800cc if you are carefull.am building an 1800 to go in my caterham 7

[eeb43]

831c would suggest 1983 onwards

[colr6]

Done a bit more digging and would appear to be early AX block, going back a bit but the value on them £500/1k I can feel a big bore coming on😜

[eeb43]

have heard of ax blocks at 1k

[piekey]

30 H 84 denotes it as a 1984 block, i believe these to be fitted in a Sierra lookalike saloon in South Africa. Later blocks came out stamped as 831c  with the AX cast in also.

In essence, these are the same thick wall blocks. Most will go to 86mm but well worth a double check on bire wall thickness first.

All were cast 80.7 ish   1600.

Cylinder heads were a sport type casting & not as a GT as we know in uk.