Marshall     ~~~  A few questions about the lower end  ,did you put in  rod
,main,cam bearings and a front & rear crank seal ?? YOU may have done more
damage from the overheating than you think .Low power problems after warming up
may be from insatalling the new standard O/D main bearings ,the cases may be
warped and when the case halfs are tightened ,this  will put a bind or squeeze on
the crank /bearing surfaces ( Simply it  makes the new round bearing out of
round  ) after heating up the metal expands and it will put a bind on your
crank // round crank trying to turn in a oblong bearing // You may need to align
bore your cases and install oversize  O/D main bearings.  // Also your cam
bearing area may be warped putting a bind on your cam after  heating up //   To
check all the above items you will have to disassemble the case halfs you will
see the bind marks on the main or cam bearings if this is your problem //  Next
is your mid section or piston & cylinder area  YOU NEVER PUT NEW ROUND RINGS
IN a used out of round cylinder NEVER !!!!!! ALL HORIZONTAL engine piston &
cylinders wear egg shaped. // You are putting new round rings on 2 out of round
objects ~~ piston & cylinder it does not  work ) after heating up you may have
lower compression  from ring blow by or you may encounter your rings binding
on high area,s // After hot run a compression test and also a air test on each
cylinder to see where you stand //  heads may also be warped and you may be
leaking compression at the cylinder and head mating area after heating up //
Run the tests and get back to the gang with results
Get yourself a NEW piston and cylinder and ring kit for A proper mid section
// there tis NO shortcut in that area !!!  Remember NEVER !!!

Don @ DVW
Online  Parts Catalog
www.dvwimportautoparts.com