15-10-2020, 08:49 AM
Hi Circeonya
Until about 1958 most cars had XB steel exh valves and BMC, Hillman et al burned valves sooner or later. I ran a javelin foolishly on weak mixtures and it murdered valves but later non magnetaic materials survived even with cracked seats.
My understanding is that the A30 originally had white metal bes and was ok with later substitutes.
I recal Bill boddy in Motor Sport explaining that his daughter had one and was uncharacteristically instructed not to exceed 50 mph (A film of BMC testing later shells was on this Forum recently)
Oils improved markedly from mid 50s and oldies now last much as moderns. (The cheapest supermarket oils are now rated higher then the best 1960s)
Until about 1958 most cars had XB steel exh valves and BMC, Hillman et al burned valves sooner or later. I ran a javelin foolishly on weak mixtures and it murdered valves but later non magnetaic materials survived even with cracked seats.
My understanding is that the A30 originally had white metal bes and was ok with later substitutes.
I recal Bill boddy in Motor Sport explaining that his daughter had one and was uncharacteristically instructed not to exceed 50 mph (A film of BMC testing later shells was on this Forum recently)
Oils improved markedly from mid 50s and oldies now last much as moderns. (The cheapest supermarket oils are now rated higher then the best 1960s)