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Engine block ID

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Engine block ID #1
MGB65Dan John Miller DURHAM, NC, USA Sign in to contact	Topic Creator (OP) Oct 27, 2016 11:28 AM Joined 7 years ago 2 Posts

Just picked up a supposedly rebuilt (15 yrs ago) V engine. It has no id tag (ripped off). The head is stamped 12H2923, and the block castings are 12H3508 & below that is AF5. The circular stamp has A on left, 3 upper right, & 2 lower right. Any idea what year it is?

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Re: Engine block ID #2
kuddlesworth55 Adam AR Lincoln, Lincolnshire, UK Sign in to contact	Oct 27, 2016 11:34 AM Joined 7 years ago 139 Posts

72-74 apparently. They went back to smaller valve heads later on. Or so I have read. But if it's been rebuilt it might just have mismatching components. I have read somewhere that the 71's also had big valves not sure though. What performance gain do you even get from having the bigger valves. I bet it's marginal.

MGB GT 1972 Black hand painted.

Future plans:

Rover K series conversion, in the shop.

Edited 2 time(s). Last edit at 2016-10-27 11:47 AM by kuddlesworth55.

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Re: Engine block ID #3
dickmoritz Dick Moritz Philly 'burbs, PA, USA Sign in to contact	Oct 27, 2016 11:41 AM Top Contributor Joined 14 years ago 26,273 Posts

Apparently a 73 engine with the desirable big-valve cylinder head...

Dick

Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

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