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[daniel_johno]

Took the engine out my dads project marcos and removed the head to see if it had been rebored etc....

i found to my delight the head fitted to it has massive valves, double valve springs and its inlet ports look enlargened and polished.

The only markings out the ordinary i can see are on the top of the head near the thermostat which is stamped 'MSR 501'. Has anyone any idea what the head is and where it is from? I will try measure the vlaves tomorrow but thought the markings may have a meaning to someone.
Engine is an A+1275 but head is A series with the external water connection blocked off, Is it ok just blocking off the connection? will it still get enough water to the head?

Thanks for looking

Daniel

[daniel_johno]

The exhaust valves i found where standard size exhaust and about 37mm inlet. The inlet ports have been opened up to a polished finish of atleast 125micro inches (for those who work in a machine shop). the exhaust ports looked opened up but are not polished.

Daniel