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2.8 in the gta and ren 25 and Espace z6w.Volvo and Pug same basic lump .
Later 24 valve jobs are around , very rare but are the ones to look out for for biggest potential .
Std GTA 2.8 is around 160 bhp but has bags of torque so don't get too hung up on brake horse with these things .
You can fit triple webbers or a big holley to get rid of the solex stuff which is a bit of a mare to fettle .
This coupled with some decent manifolds may get you near the 200 bhp mark .