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MG parts spares and accessories are available for MG T Series (TA, MG TB, MG TC, MG TD, MG TF), Magnette, MGA, Twin cam, MGB, MGBGT, MGC, MGC GT, MG Midget, Sprite and other MG models from British car spares company LBCarCo.

MG MGA - Cylinder head geometry

In looking at what I have (1622 block with "15" head) I made a lot of measurements and constructed a plan of the bores and valves. It seems that the edges of the exhaust valves come outside of the bores by about .078". They do not crash the block b/c there is room in the head with the normal valve lift. Just an interesting observation. With a "16" head, the overlap increases to about 0.11". It seems that clearance pockets in the block are only required if fitting a shallow type B head, or if the head has been seriously skimmed.
A Pearse

Correct, or if a higher lift cam is used most, engine builders want about a minimum of .060" clearance from valve to block.
Len Fanelli

This thread was discussed between 16/01/2009 and 18/01/2009

MG MGA index

This thread is from the archive. The Live MG MGA BBS is active now.