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Headlamps from this car have adorned the front of 31225 for the last 40 years- The pistons have no oil rings, two substantial compression, then a groove with drain holes- The residue of the oil in the sump stuck to your skin like tar, almost impossible to scrub off! The valves have no guides, run direct in the iron block, unequal stem diameters, the inlets larger than the exhausts, perhaps Anzani's were using up old stock left over from their cancelled aero engine contracts. The amount of carbon deposit under the exhaust valve heads had to to seen to believe! Bit plasticy to not hard, benzol based fuels were popular I believe, not the volativity of today's fuel. I remember a picture of Birkin filling his Alfa during a TT, would be 1931 I guess, big funnel in the tank, emptying a churn into it, fuel sloshing all over and he has a fag in his mouth!