Edit: For a slightly less lazy answer. IIRC @Killrob said in one of the later LDUs, that using 90 degree V6s if you have been doing loads of V8s would result in better familiarity bonuses than making 60 degree V6s.
Edit: For a slightly less lazy answer. IIRC @Killrob said in one of the later LDUs, that using 90 degree V6s if you have been doing loads of V8s would result in better familiarity bonuses than making 60 degree V6s.