That's what I thought Phil, but not quite; the HS Chevette has a 2.3 iron block whereas the Lotus and Jensen Healey had an alloy block 2 litre which was later upped into a 2.2. Initially the HS had Lotus heads but because of FIA regs Vauxhall had to make their own which, strangely, are almost identical to the old Lotus ones. So close they are interchangeable. The HS doesn't Rev as high as the Lotus but has very similar performance. I hope to take mine up from 140bhp to about 180-190 which should, with short gearing, make it fly.