I have these  For sale   Magnesium and other parts for PA engines

Special PA NVAs  with fuel pickup and needle all on one side   $25.00  many uses, will have the needle on opposite side if muffler on side EX engines

8- additional PA 75 Merlin  RE engines  will be available  for sale  Approx 3/17   $499.00
      These 8 will be first come first serve

Jett small Stunt 36 side exhaust  cnc Barstock motor new                            $259.00
New  rear mufflers  for  PA 40 , 51, 61, 65, 75 and K-77 engines  alum and  carbon Fiber    $75.00   $ 89.95 

4 blade  cut out cnc Aero spinners  1 3/4 , 2/ in NN  and  Classic

Mag heads PA 40 Ultralight    $44.00
Mag heads  standard  PA 40     $44.00
Mag heads for PA 61              $44.00
Mag Back plate   PA  61          $38.00
Mag head  PA  51                  $44.00

CNC Aero Spinners 1 3/4 in NN      $35.95 with adapter set
CNC  magnesium backplates for  1 3/4 in  Aero Spinner    $19.00 each

OS LA 46   NEW  Blue Smith B&B with front OS NVA   145.00  with PA  NVA  149.00   Engine only
OS LA 46   NEW  Silver Smith B&B with front OS NVA   145.00  with PA  NVA  149.00   engine only
New older FOX 35s  with side luggs pre 40th anniv models great motor  NEW in Box  $90.00
Smith CNC Fox 35 Hemi heads    $36.95
George Aldrich/FOX 40 stunt engine from the 1970s  excellent low time      $105.00
George Aldrich  McCoy/McGas  35 chromed not run since George sent them to me   $120.00    sold !!
Tom Dixon  FOX 40 compact setup new  just has  breakin  run time  engine and box     $80.00
Tiger Shark  39 ball bearing 39 setup for  C/L stunt  like  Thunder Tiger  36 39         $149.95
New in box  FOX 50 CL     $149.00
Magnum 36 sq head  Randy  B&B to  C/L  129.00

How much weight is shaved by going to a mag head on the PA 40 ultralite, and changing to a mag head and backplate on the rear exhaust PA 61? Does it change the run characteristics of either engine?