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MG MGA - BP15 vs. 15 GD horsepower dif

The horsepower for the BP15 engine is stated @ 68/5200 and the 15GD is 72/5500. Is this difference due just to the increase in RPM or were there any other changes when the BP block designation was changed that account for this?
GD Glenn

It is a minor flow difference bewteen the very early heads and later heads.
Bill Spohn

Does that mean that you can increase the HP of a BP15 engine to 72hp if a later head is installed?

G Goeppner

Bill Spohn

Thanks Bill. After reading what you posted, I went to the factories Special Tuning publication and on pages 16 & 17 it discribes and shows the changes to be made in the earlier heads to achive the increase. It also gives the numbers for when the changes were made.
GD Glenn

This thread was discussed between 05/08/2008 and 07/08/2008

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