<PAGE>   1
                                                                    EXHIBIT 24.1



                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                      /s/ Walter E. Blankley
                                                      ----------------------
                                                      Walter E. Blankley


<PAGE>   2







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                     /s/ Peter H. Forster
                                                     --------------------
                                                     Peter H. Forster


<PAGE>   3







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                          /s/ Ivan W. Gorr
                                                          ----------------
                                                          Ivan W. Gorr


<PAGE>   4







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                    /s/ R. William Van Sant
                                                    -----------------------
                                                    R. William Van Sant


<PAGE>   5







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.





                                                     /s/ Earl T. O'Loughlin
                                                     ----------------------
                                                     Earl T. O'Loughlin


<PAGE>   6







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                      /s/ William G. Roth
                                                      -------------------
                                                      William G. Roth


<PAGE>   7







                                POWER OF ATTORNEY
                                -----------------



         WHEREAS, Amcast Industrial Corporation (the "Company") intends to file
with the Securities and Exchange Commission its Annual Report on Form 10-K for
the year ended August 31, 1998;


         NOW, THEREFORE, the undersigned in his capacity as a director of the
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them,
his true and lawful attorneys-in-fact and agent, with full power of substitution
and resubstitution, to execute in his name, place, and stead, the Company's
Annual Report on Form 10-K for the year ended August 31, 1998, (including an
amendment to such report) and any and all other instruments necessary or
incidental in connection therewith, and to file the same with the Securities and
Exchange Commission. Said attorneys shall have full power and authority to do
and perform in the name and on behalf of the undersigned, in the aforesaid
capacity, every act whatsoever necessary or desirable to be done, as fully to
all intents and purposes as the undersigned might or could do in person. The
undersigned hereby ratifies and approves the acts of said attorneys.


         IN WITNESS WHEREOF, the undersigned has executed this instrument this
21st day of October, 1998.




                                                    /s/ Leo W. Ladehoff
                                                    -------------------
                                                    Leo W. Ladehoff

<PAGE>   8
                               POWER OF ATTORNEY
                               -----------------

     WHEREAS, Amcast Industrial Corporation (the "Company") intends to file 
with the Securities and Exchange Commission its Annual Report on Form 10-K for 
the year ended August 31, 1998;


     NOW, THEREFORE, the undersigned in his capacity as a director of the 
Company hereby appoints John H. Shuey and Douglas D. Watts, and each of them, 
his true and lawful attorneys-in-fact and agent, with full power of 
substitution and resubstitution, to execute in his name, place and stead, the 
Company's Annual Report on Form 10-K for the year ended August 31, 1998, 
(including an amendment to such report) and any and all other instruments 
necessary or incidental in connection therewith, and to file the same with the 
Securities and Exchange Commission. Said attorneys shall have full power and 
authority to do and perform in the name and on behalf of the undersigned, in 
the aforesaid capacity, every act whatsoever necessary or desirable to be done, 
as fully to all intents and purposes as the undersigned might or could do in 
person. The undersigned hereby ratifies and approves the acts of said 
attorneys.


     IN WITNESS WHEREOF, the undersigned has executed this instrument this 21st 
day of October, 1998.


                                                     /s/ James K. Baker
                                                     ------------------
                                                     James K. Baker